International Comet Quarterly

Recent Comet Brightness Estimates


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Selected recent magnitude estimates (often preliminary values!), as reported to the IAU Circulars and International Comet Quarterly for currently-observable comets are given below. NOTE: in 1997, we began adding select magnitudes from fainter comets from CCD astrometry reported to the Minor Planet Center, to make the list of comets below pretty complete for observable comets seen in the last couple of months, for the convenience of observers/readers who wish to know the most recent magnitude information on fainter comets. (Definitions of the "magnitude" and other terms regarding comets are available.)



NOTE that many values below should be considered preliminary, and as such the data below (and that published on IAU Circulars) should not be used in any serious analyses; furthermore, many of the best comet observers do not have their data listed below (and there is a huge difference in the quality of observations from one observer to another -- both visually and via CCD). Indeed, it is not uncommon that photometric data listed below are actually withdrawn by observers (or the ICQ Editor) due to problems, and sometimes substantial changes are made to the magnitudes before publication in the ICQ. The final, complete form of the data in the published ICQ (or in the electronic ICQ archive of photometric cometary observations) is what should be used. The data below are meant more as an informal guide to current behavior of observable comets. (In general, the data below will be kept on this page only until the detailed tabulated complements to the observations are published in the ICQ -- i.e., quarterly -- at which time they will be eliminated from this page. There is currently no plan to make ICQ-published data available on the Web, but such data are available to interested researchers upon request via e-mail, by individual comet.)

We now have a "Descriptive Information" page, reporting interesting information to supplement the magnitudes below.


At the end of the year 2000, we deleted numerals following comet names on these ICQ webpages and in the ICQ printed pages. With there being no longer a comet named "Shoemaker 2" (leaving "Shoemaker 3" and "Shoemaker 4"), the illogical and unnecessary existence of numerals following comet names makes the start of a new millennium a good time to cease using those numerals. Especially with the wonderful numbering system for short-period comets in place since 1995, whereby comets of two or more apparitions have been assigned permanent numbers, it is redundant to have numerals after a comet's name, and short-period comets of a single apparition have not gotten suffixed numerals since the change to the new designation system in 1995 anyway; for 1-apparition short-period comets discovered prior to 1995, the ICQ will begin using both new-style and old-style designations to help in the unambiguous titling of a specific comet. Indeed, as Brian Marsden noted in the January 1995 issue of the ICQ, history shows great inconsistency and problems regarding the addition of numerals to short-period comet names, and it makes sense to phase them out completely. Some people will prefer to continue using the suffixed name numerals, but we trust that there will be no ambiguity to the new ICQ policy for readers. Most observers appear to be quite comfortable with the new designation system (particularly regarding the permanently-numbered short-period comets), so this policy should not present problems for most people. The old suffixed numerals of comet names are still visible in the list of permanently numbered comets.


An asterisk (*) below denotes that correction was made in the magnitude estimate for atmospheric extinction, while a percent sign (%) incidates that magnitudes of very red comparison stars were corrected to visual magnitudes before use. A colon (:) after the magnitude estimate indicates that the estimate is approximate (uncertainty greater than +/- 0.3 mag); likewise, an ampersand (&) before the coma-diameter estimate indicates that the estimate is approximate. Below are given the Universal Time (UT) date, to 0.01 day, now in reverse chronological order ; the total magnitude estimate; the coma diameter (usually in minutes of arc), with a preceding plus (+) sign for 'artificial' coma diameters employed in CCD photometry (and an exclamation mark for limiting magnitude estimates when the comet is not seen, to denote the size of the defocused comparison-star images); the observer and observing location; and the instrument USED FOR THE MAGNITUDE ESTIMATE (with the size of the instrument indicating the size of the aperture --- i.e., the primary lens or mirror --- in centimeters or meters). In the listing below, if a comet is not seen and a limiting (stellar) magnitude given, a left bracket, [, appears before the magnitude value. A letter 'z' after a coma diameter indicates that it may have been made with a different instrument.


ALERT! Due to excessive spam-e-mailing, it is imperative that legitimate e-mail with observations sent for possible posting here should ONLY be sent in plain-ASCII text and NEVER be sent with html encoding. Also, images should only be sent in e-mails *separate* from plain-text observations, and they should ONLY be sent after first contacting us at ICQCSC@EPS.HARVARD.EDU to inquire if we'd like to receive images (some select photographers who routinely send high-quality images to the ICQ have a long-time exemption from this rule). Our anti-spam software automatically deletes e-mail with html-encoding and images or MIME-encoding (or anything that does not appear as plain text), so your e-mail may never reach us if you do not follow these guidelines. [11/27/07]


NOTE: Please do not send e-mail with html coding or MIME encoded (or any other encoded way)! Please only send e-mail as straight or plain ASCII text. When sending data for inclusion in this webpage and/or on the IAU Circulars, please send data as listed below, EXCEPT give them chronologically (not in reverse chronological order as given below) and please also give the month on each line of observation (rather than blanks as shown below for second and third observations in the same month). Be sure to give diacritical marks in TeX form (described elsewhere in these webpages). Please send observations daily only for urgent objects -- comets in outburst, comets close to the earth, or novae/variable stars that are rapidly changing their brightness (for IAUCs). Routine comet observational data should be sent only once every week or two, as daily e-mail from dozens of observers can be very difficult to deal with. Please put "CCD [or visual] comet photometry for webpage [or ICQ]" in subject heading.


COMETS LISTED BELOW BY DESIGNATION (unnumbered comets first, numbered comets second). Jump directly to comet: C/2017 T2 (PANSTARRS), or C/2019 Y4 (ATLAS), or C/2020 F8 (SWAN), or 58P/Jackson-Neujmin, or 240P/NEAT. NOTE that magnitudes of unnumbered comets for the period 2010-2018 have been moved to this webpage.

NOTE: when a comet is large in size, as comet 17P has been in Nov. 2007, normal binoculars cannot defocus enough to produce proper magnitude estimates, leading to values that are too faint; special instruments are needed for comets larger than about 10' or 15' in size (such instruments include binoculars with detached eyepieces, or 1x monoculars constructed from two binocular objective lenses).


COMET C/2010 U3 (Boattini)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
May  16.37, 18.3, 0'.40 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     14.31, 17.7, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
2019
Nov. 29.74, 17.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr.  3.64, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 13.73, 16.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Dec. 13.70, 16.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar.  3.64, 16.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 13.59, 16.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Dec. 22.68, 16.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 25.71, 16.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
Nov.  3.58, 17.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2014
Aug.  5.72, 18.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2013
Nov. 30.65, 18.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2011 KP36 (Spacewatch)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Jan.  2.51, 17.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Oct. 20.69, 17.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb. 12.51, 16.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  5.55, 16.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Dec. 23.50, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 10.74, 16.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 26.69, 16.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 18.74, 16.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     11.74, 16.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  1.49, 14.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
Dec.  2.57, 14.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov. 16.80, 12.3, 1' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
      4.44, [12.9, ! 0'.7 (S. Yoshida, Kita-karuizawa, Gunma, Japan, 0.40-m reflector);
      2.50, 13.6, 1'.8 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
Oct. 26.84, 12.3, 1'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     20.45, 13.1, 0'.9 (S. Yoshida, Kita-karuizawa, Gunma, Japan, 0.40-m reflector);
     11.64, 12.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep.  9.69, 13.6, 1'.7 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
      1.74, 14.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.73, 13.0, 0'.8 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Aug. 25.95, 13.6, 0'.4 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
July 28.70, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      9.11, 13.3, 0'.8 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
May  28.76, 15.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  2.41, 15.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2015
Dec. 19.42, 15.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 18.45, 14.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 18.53, 14.5, 1'.0 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
     13.46, 14.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     10.81, 14.5, 0'.1 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
June 23.69, 15.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2014
June  1.66, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2014 B1 (Schwartz)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
May  11.58, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 23.62, 16.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 19.76, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Mar.  3.70, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 20.64, 16.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Dec. 28.70, 16.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 28.88, 15.6, 0'.47 (M. L. Paradowski, Lublin, Poland, 0.15-m reflector + CCD + V filter);
Feb.  6.83, 15.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  1.71, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
Dec.  9.65, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov. 19.74, 15.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 22.82, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2014 OG392 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Sep. 13.72, 20.3, 8" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
 
 
COMET C/2015 O1 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
May  24.47, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      5.53, 15.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr.  7.57, 15.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 16.64, 14.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb. 14.72, 14.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 18.70, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Dec. 29.73, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.84, 15.1, 0'.8 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + V filter + CCD);
Nov. 15.79, 14.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.76, [13.0, ! 0'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Oct.  6.82, 14.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 17.46, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 15.52, 13.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     13.49, 12.8, 1'.0 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
May  15.99, 12.0, 1'.2 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     10.56, 14.1, 1'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      8.96, 12.2, 1'.2 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      4.94, 12.2, 1'.0 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      4.56, 13.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.50, 13.1, 1'.2 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      3.53, 13.5, 0'.8 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Apr. 19.85, 12.8, 1'.5 (M. Lehky, Hradec Kralove, Czech Republic, 0.20-m reflector);
     18.85, 12.8, 1'.6 (M. Lehky, Hradec Kralove, Czech Republic, 0.20-m reflector);
     18.83, 13.7, 0'.6 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     17.85, 12.7, 1'.5 (M. Lehky, Hradec Kralove, Czech Republic, 0.20-m reflector);
      5.89, 12.2, 1'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Mar. 31.61, 13.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     24.73, 13.2, 1'.6 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     12.80, 12.8, 1'.4 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     11.78, 13.3, 1'.2 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
Feb. 23.77, 13.6, 1'.3 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     23.73, 13.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     17.76, 13.7, 1'.3 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
Jan. 26.78, 13.9, 1'.2 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     18.21, 12.8, 1'.2 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
2017
Nov.  3.36, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct.  9.41, 14.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep.  3.45, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 21.86, 14.0, 0'.89 (M. L. Paradowski, Dabrowa, Poland, 5-cm camera lens + CCD);
July 14.96, 14.5, 0'.2 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      7.68, 14.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.92, [13.5, -- (W. Hasubick, Buchloe, Germany, 44-cm reflector);
May  18.70, 14.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr. 15.74, 15.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
July  3.63, 16.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr. 19.77, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2015 XY1 (Lemmon)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Sep. 14.75, 18.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  1.64, 17.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Oct. 20.76, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar.  4.53, 17.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  6.69, 17.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Dec. 29.67, 17.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov.  4.73, 17.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
Nov. 24.67, 18.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2016 A1 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Jan.  2.56, 16.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Oct. 21.67, 16.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May   5.50, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr.  2.86, 17.4, 0.'3 (J. Qvam, Horten, Norway, 0.50-m reflector + CCD + V filter);
Mar. 24.56, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 31.55, 15.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     13.56, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Dec. 17.68, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov. 19.71, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr. 15.50, 16.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 28.61, 16.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.71, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
Nov. 24.79, 16.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2016 N4 (MASTER)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Jan. 24.74, 17.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
Dec. 11.44, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov. 19.44, 15.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 15.52, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 20.73, 16.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.74, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 30.67, 16.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     28.68, 16.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2016 M1 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 18.54, 17.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2020
Dec. 18.62, 17.5, 25" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
Jan.  2.55, 15.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Dec. 14.64, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov.  9.74, 15.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Oct. 12.94, 10.3, 2'.5 (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
July 20.17, 8.8, 6' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     16.58, 9.0, 6' (M. Mattiazzo, Swan Hill, Vic, Australia, 25x100 binoculars);
     15.97, 8.8, 3' (W. Souza, Sao Paulo, Brazil, 0.10-m refractor);
     15.14, 8.7, 6' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
      6.12, 8.4, 6' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
      4.06, 8.5, 6' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
June 22.05, 8.9, 3' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor; moonlight);
     21.65, 8.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     21.06, 8.9, 4' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
     19.05, 7.7, 10' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars);
     14.07, 8.9, 3' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
     13.70, 9.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     13.06, 8.3, 6' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
     10.36, 8.9, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     10.33, 9.0, 2' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
      9.03, 9.0, 2' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
      8.35, 9.3, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
      8.33, 8.9, 3' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
      7.68, 9.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.05, 9.0, 2' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor; close to bright-ish star);
      6.32, 9.0, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
      4.27, 9.0, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
      4.05, 9.0:, -- (A. Amorim, Florianopolis, Brazil, 0.09-m refractor; close to bright-ish star);
May  30.14, 9.5:, -- (A. Amorim, Florianopolis, Brazil, 0.09-m refractor; moonlight);
     29.36, 9.6:, -- (A. Amorim, Florianopolis, Brazil, 0.09-m refractor; moonlight);
     28.36, 9.5, 2' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
     27.46, 9.4, 3' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     27.36, 9.6, 1' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
     24.46, 9.1, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     24.36, 9.8, 1' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
     22.46, 9.1, 3' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     22.36, 9.8, 1'.5 (A. Amorim, Florianopolis, Brazil, 0.09-m refractor; near bright-ish star);
     21.36, 9.8:, 1' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
     21.07, 8.9, 5' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
     19.69, 10.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     18.46, 9.6, 3' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     16.02, 9.0, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     15.46, 9.6, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     15.17, 10.1:, 0'.5 (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
     14.69, 10.9, 1'.5 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera + green channel);
     12.46, 9.9:, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     10.69, 10.8, 2'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera + green channel);
      9.17, 10.6, 2'.5 (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      9.09, 9.3, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      4.72, 10.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.76, 10.5, 1'.7 (S. Yoshida, Gunma, Japan, 0.40-m reflector; bright moonlight);
Apr. 22.27, 10.8, 2' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     20.09, 10.5, 5'.5 (M. Lehky, Hradec Kralove, Czech Republic, 0.20-m reflector);
     20.08, 11.3, 1'.0 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     19.08, 10.5, 5'.5 (M. Lehky, Hradec Kralove, Czech Republic, 0.20-m reflector);
     18.76, 11.4, 1'.8 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + V filter + CCD);
     18.08, 10.6, 5' (M. Lehky, Hradec Kralove, Czech Republic, 0.20-m reflector);
     12.49, 11.8, 1'.7 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector + CCD, at Mayhill, NM);
Mar. 31.74, 12.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     24.74, 12.7, 1'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     24.33, 11.3, 1'.5 (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     16.82, 12.4, 1'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     13.82, 12.6, 1'.3 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
      3.78, 12.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb. 17.84, 12.8, 1'.4 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     12.84, 12.7, 1'.8 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
Jan. 26.87, 13.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     26.85, 13.4, 0'.9 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     12.86, 13.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Oct. 26.40, [13.9, ! 0'.4 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Sep. 30.44, 14.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July  8.51, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  19.72, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr. 23.07, 16.4, 0'.3 (J. Qvam, Horten, Norway, 0.50-m reflector + CCD + V filter);
Mar. 24.76, 16.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 27.86, 16.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2016 N6 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Mar. 31.42, 14.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb. 16.48, 13.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  9.65, 12.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Dec. 31.64, 11.9, 1'.5 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     25.63, 12.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     14.08, 11.5, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      9.27, 12.3, 1' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      1.76, 12.6, 1'.1 (S. Yoshida, Gunma, Japan, 0.40-m reflector; moonlight);
Nov. 30.67, 12.3, 1'.0 (S. Yoshida, Gunma, Japan, 0.40-m reflector; moonlight);
      7.74, 12.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.75, 11.9, 1'.9 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Oct. 28.78, 12.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     20.19, 11.8, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     13.07, 13.5, 0'.26 (S. E. Shurpakov, Baran, Belarus, 20-cm reflector + CCD);
      7.73, 13.2, 0'.8 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      6.78, 12.9, 0'.8 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      6.77, 12.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 16.81, 13.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June 12.95, 11.7, 1'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
May  26.51, 12.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     15.97, 11.6, 2'.0 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      8.92, 11.8, 1'.7 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      5.53, 12.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.90, 11.9, 1'.2 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      4.57, 12.7, 1'.1 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      3.51, 12.3, 1'.4 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Apr. 19.47, 13.2, 1'.2 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
      7.82, 12.8, 0'.6 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      5.90, 12.0, 1'.2 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Mar. 24.59, 12.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     20.89, 12.0, 1'.2 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     18.84, 13.4, 0'.9 (J. Qvam, Horten, Norway, 0.50-m reflector + CCD + V filter);
     12.45, 12.7, 1'.1 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     11.51, 13.0, 1'.0 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
Feb. 26.22, 13.3, 0'.75 (K. Yoshimoto, Yamaguchi, Japan, 0.32-m reflector + CCD, at Nerpio, Spain);
     17.86, 12.1, 1'.2 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     17.76, 13.4, 1'.3 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     12.76, 13.2, 2'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
      7.69, 13.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  9.85, 13.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Dec. 31.54, 14.3, 0'.54 (K. Yoshimoto, Yamaguchi, Japan, 0.50-m reflector + CCD, at Mayhill, NM);
     22.86, 14.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     18.80, 14.2, 0'.5 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
Nov. 16.23, 13.5, 0'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Sep.  3.50, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July  8.55, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  19.67, 16.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      5.94, 17.2, 0'.2 (J. Qvam, Horten, Norway, 0.50-m reflector + CCD + V filter; moonlight);
 
 
COMET C/2016 Q2 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Oct. 18.12, 18.4, 10" (H. Sato, Tokyo, Japan, remotely with 0.43-m astrograph + CCD);
 
 
COMET C/2016 R2 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Sep. 16.43, 17.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 25.61, 16.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  19.71, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.71, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr.  6.67, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb.  1.75, 14.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 14.19, 10.5, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      2.77, 14.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.26, 10.7, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
2018
Nov. 16.16, 10.2, 7' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     13.16, 10.2, 7' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
      9.19, 10.3, 6' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
      3.80, 10.5, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      3.80, [11.8, ! 1'.1 (S. Yoshida, Gunma, Japan, 0.40-m reflector; low alt.; bright sky);
Oct. 20.82, 13.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     20.20, 11.0, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     16.18, 10.7, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      3.84, 10.3, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Sep.  1.87, 10.5, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Aug. 17.44, 13.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     14.90, 10.4, 7' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      9.90, 10.7, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.90, 11.3, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
July  9.92, 11.3, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
June 12.93, 11.5, 2' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      2.46, 12.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  15.90, 11.3, 2' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      8.90, 11.1, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      5.44, 12.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.92, 11.2, 2'.2 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      4.48, 13.2, 0'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      3.50, 13.1, 0'.9 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Apr. 21.48, 12.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.81, 10.8, 1'.0 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      5.86, 10.5, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Mar. 25.44, 12.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     20.86, 11.2, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     12.43, 11.6:, 1'.5 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector; overlapping mag-12.8 star);
     10.45, 12.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb. 17.83, 10.5, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     12.84, 10.5, 4' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
      4.56, 11.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 21.46, 11.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     17.92, 10.0, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     12.17, 12.0, 2'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.11-m astrograph + CCD, at Mayhill, NM);
      8.92, 10.0, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      6.48, 11.1, 2'.6 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
      3.54, 11.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Dec. 27.86, 10.8, 4' (M. L. Paradowski, Lublin, Poland, DSLR camera + 3.4-cm lens; moonlight);
     27.69, 10.7, 3' (K. Yoshimoto, Yamaguchi, Japan, 26x100 binoculars);
     24.75, 12.4, 1'.5 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     20.13, 10.2, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     19.45, 11.0, 2'.6 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     18.72, 11.5, 2'.3 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     17.53, 11.1, 3'.5 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD + V filter);
     16.54, 11.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     16.14, 10.1, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     11.39, 11.4, 1'.8 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     10.53, 11.6, 3'.2 (K. Yoshimoto, Yamaguchi, Japan, 0.43-m reflector + CCD, at Siding Spring);
Nov. 26.47, 11.8, 1'.5 (C. Hergenrother, Tucson, AZ, U.S.A., 0.35-m reflector);
     26.17, 11.1, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     24.75, 12.6, 1'.4 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     24.61, 11.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     23.68, 12.0, 1'.9 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
     21.70, 11.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     16.18, 11.7, 1'.3 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     14.19, 11.8, 1'.3 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Oct. 26.68, 13.2, 0'.7 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     25.74, 13.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     16.09, 13.6, 0'.3 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      7.73, 13.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.20, 13.2, 1'.1 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Sep. 30.73, 14.5, 0'.9 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     25.73, 14.0, 0'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      2.80, 14.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 19.80, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 22.41, 15.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.45, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
Dec. 23.49, 16.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     10.53, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov. 27.50, 15.4, 0'.9 (K. Yoshimoto, Yamaguchi, Japan, 0.32-m reflector + CCD at Siding Spring);
 
 
COMET C/2016 X1 (Lemmon)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Jan. 27.55, 18.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Dec. 29.61, 18.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
Dec. 25.64, 20.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2017 B3 (LINEAR)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan.  2.05, 16.5, 25" (H. Sato, Tokyo, Japan, remotely with a 0.43-m astrograph + CCD at Mayhill, NM);
2020
Dec. 19.16, 17.2, 0'.7 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      5.20, 16.8, 0'.7 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Nov. 13.46, 16.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 24.31, 15.8, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     20.31, 15.8, 0'.9 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     19.34, 15.9, 0'.9 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Aug. 27.36, 16.0, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Feb.  2.38, 15.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  1.39, 15.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Dec.  1.40, 15.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov.  4.43, 14.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Jan. 29.76, 15.3, 12" (H. Sato, remotely with a 0.51-m astrograph at Siding Spring);
2017
May  20.48, 17.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2017 E3 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
May  11.71, 18.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
June  2.61, 17.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr. 22.63, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 24.76, 16.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 26.84, 17.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2017 K2 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Dec.  6.37, 14.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 24.47, 14.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     11.45, 15.2, 0'.8 (K. Yoshimoto, Kumage, Yamaguchi, Japan, 0.20-m reflector + CCD);
Sep. 25.18, 15.4, 0'.9 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     23.18, 15.4, 1'.1 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     20.19, 15.4, 0'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     19.23, 15.4, 1'.1 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     12.91, 13.5, 0'.2 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      8.48, 15.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.22, 15.5, 0'.9 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Aug. 27.21, 15.4, 0'.9 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     26.20, 15.5, 0'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     25.21, 15.4, 0'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     16.83, 15.2, 0'.42 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter);
     15.22, 15.5, 0'.7 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     13.22, 15.5, 0'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     11.22, 15.5, 0'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      9.22, 15.6, 0'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      7.22, 15.5, 1'.0 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      2.51, 15.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 29.57, 15.3, 0'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
     28.91, 14.6, 0'.42 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter);
     12.90, 14.5, 0'.3 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     10.05, 15.1, 0'.42 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter);
      1.93, 14.7, 0'.42 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter; moonlight);
June 26.01, 15.6, 0'.42 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter; moonlight);
     24.93, 15.2, 0'.42 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter);
     18.88, 15.6, 0'.42 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter);
     15.31, 15.8, 0'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     12.99, 15.0, 0'.42 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter);
     10.33, 15.7, 0'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
May  21.36, 15.9, 0.5' (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     17.52, 15.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     16.39, 15.8, 0'.63 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     14.33, 15.9, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Mar. 21.73, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 18.81, 16.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Nov.  9.37, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 25.44, 16.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 25.64, 16.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May   5.63, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 16.74, 17.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb.  2.74, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Oct. 29.40, 17.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 17.54, 17.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July  2.64, 17.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  15.61, 17.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr. 18.73, 18.0, 0'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
      8.73, 17.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb. 23.79, 17.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 12.82, 18.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Sep. 30.50, 18.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June 22.71, 18.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     16.96, 18.5, 0'.2 (K. Yoshimoto, Yamaguchi, Japan, 0.43-m reflector + CCD, at Nerpio, Spain);
 
 
COMET C/2017 K4 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Jan.  3.45, 19.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Nov. 15.67, 18.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct.  1.62, 17.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 25.73, 17.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 20.73, 17.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  26.74, 17.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr. 27.82, 17.0, 12" (H. Sato, remotely with a 0.51-m astrograph at Siding Spring);
2017
Oct.  9.39, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 18.54, 15.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2017 K5 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Sep. 16.47, 18.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr.  2.43, 18.2, 8" (H. Sato, Tokyo, Japan, remotely with 0.43-m astrograph + CCD);
 
 
COMET C/2017 K6 (Jacques)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Jan.  2.64, 18.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Apr. 21.43, 16.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 31.42, 15.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     17.44, 15.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.42, 15.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb. 18.39, 14.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.42, 14.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 21.40, 14.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     13.36, 14.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
May  31.80, 18.3, 0'.1 (K. Yoshimoto, Yamaguchi, Japan, 0.43-m reflector + CCD, at Siding Spring);
 
 
COMET C/2017 M4 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Feb. 4.69, 15.8, 18" (H. Sato, Tokyo, Japan, remotely with 0.51-m astrograph + CCD at Siding Spring);
Jan. 30.76, 15.9, 18" (H. Sato, Tokyo, Japan, remotely with 0.51-m astrograph + CCD at Siding Spring);
2019
May   9.67, 13.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr. 12.73, 12.6, 1'.4 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD + green channel);
      8.72, 13.3, 1'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD + green channel);
      6.77, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.74, 12.3, 1'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD + green channel);
Mar. 31.75, 12.7, 0'.9 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD + green channel);
     13.75, 13.9, 0'.9 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD + green channel);
2018
Oct. 28.40, 14.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     21.39, 14.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.43, 14.0, 0'.4 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      6.41, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 12.90, 14.6, 0'.3 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
July 31.63, 14.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     14.54, 13.8, 0'.7 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
     13.51, 13.6, 0'.4 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      2.67, 14.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June 12.98, 14.4, -- (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
May  22.71, 14.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.63, 14.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr.  7.75, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar.  3.80, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  6.40, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Dec.  3.41, 16.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 30.55, 17.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     17.46, [13.7, ! 0'.4 (S. Yoshida, Gunma, Japan, 0.40-m reflector; strong moonlight);
July  8.63, 17.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2017 T2 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Sep.  7.39, 12.4, 2'.4 (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD
Aug. 15.46, 11.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     13.90, 10.4, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     13.19, 12.5, 3'.0 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      9.19, 12.7, 1'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      8.96, 10.3, 3' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      8.19, 12.6, 1'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      7.19, 12.4, 2'.2 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      2.20, 12.6, 2'.1 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      1.21, 12.2, 3'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
July 26.42, 10.6, 2.5'(P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     25.44, 10.6, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     24.95, 9.8, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     24.43, 10.5, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     23.43, 10.5, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     21.36, 10.4, 5' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     20.42, 10.4, 2'.5 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     19.52, 10.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     19.42, 10.3, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     19.37, 10.3, 2'.8 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     18.42, 10.5, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     17.42, 10.3, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     16.45, 10.3, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     14.47, 9.9, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     13.44, 9.8, 3' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     12.96, 10.0, 2'.5 (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     12.88, 9.2, 6'.1 (W. Hasubick, Buchloe, Germany, 10-cm refractor);
     12.44, 9.7, 3' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     11.94, 10.0, 2' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      9.91, 9.4:, 1' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
      9.43, 9.6, 4' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
      7.45, 9.6, 3' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
      7.35, 10.1, 4'.8 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      6.35, 9.8, 3'.6 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      4.90, 9.3:, 1' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor; moonlight);
      2.51, 9.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.86, 11.9, 1'.27 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD+ R_c filter; moonlight);
June 30.35, 9.7, 3'.1 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector; moonlight; alt. 16 deg);
     26.49, 9.5, 4' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     26.37, 9.4, 4'.3 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector; alt. 13 deg);
     25.91, 11.6, 1'.27 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter; moonlight);
     24.82, 10.9, 1'.27 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter);
     24.52, 9.5, 4' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     22.44, 9.5, 3' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     21.43, 9.5, 3' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     21.00, 9.1, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     20.93, 9.2, 4' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     20.43, 9.4, 4' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     19.45, 9.2, 4' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     19.35, 9.4, 4' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector; alt. 8 deg);
     18.87, 10.5, 1'.27 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter);
     18.45, 9.0, 4' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     17.34, 9.7, 5'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector; alt. 7 deg);
     17.25, 8.6, 9' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     16.43, 9.0, 4' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     16.34, 9.8, 3' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector; alt. 6 deg);
     15.42, 8.9, 4' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     15.34, 9.8:, 2' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector; alt. 5 deg);
     15.25, 8.8, 9' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     14.43, 9.1, 3' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     14.27, 8.6, 10' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     13.41, 9.0, 3' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     13.22, 8.5, 9' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     12.85, 11.0, 1'.27 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter);
     12.46, 9.0, 3' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     12.22, 8.5, 10' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     11.79, 9.0, 4' (S. J. O'Meara, Maun, Botswana, 20-cm reflector);
     11.28, 8.5, 10' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     10.28, 8.5, 10' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
      9.45, 9.0, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
      9.26, 8.7, 9' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
      8.42, 9.0, 5' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
      8.21, 8.8, 8' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
      7.41, 9.0, 4' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
      4.86, 10.9, 1'.27 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter);
      3.82, 11.0, 1'.27 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter);
      1.84, 10.6, 1'.27 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter);
May  29.85, 10.9, 1'.27 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter);
     29.68, 10.1, 2'.5 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     27.23, 8.4, 9' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     26.83, 11.0, 1'.27 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter);
     26.25, 8.4, 9' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     26.00, 8.6, 5' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     25.85, 11.1, 1'.27 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter);
     25.22, 8.3, 10' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     24.22, 8.3, 8' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     23.83, 8.7, 6' (T. Scarmato, Calabria, Italy, 20x80 binoculars);
     23.22, 8.3, 9' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     22.84, 10.6, 1'.27 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter);
     22.22, 8.3, 10' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     21.90, 11.0, 1'.27 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter);
     21.22, 8.3, 9' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     18.46, 8.4, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     18.07, 8.7, 5' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     17.90, 8.6, 4'.6 (W. Hasubick, Buchloe, Germany, 10-cm refractor);
     17.45, 8.6, 5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     17.20, 8.2, 9' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     16.20, 8.3, 8' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     16.16, 8.6, 5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     15.20, 8.3, 9' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     14.20, 8.5, 8' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     13.57, 9.0, 3' (Y. Nagai, Saitama, Japan, 20x100 binoculars);
     13.16, 8.3, 5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     12.15, 8.5, 3' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
      8.49, 8.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.14, 8.3, 3' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
Apr. 30.70, 9.4, 4'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     30.14, 8.5, 5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     29.23, 8.5, 10' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     28.20, 8.5, 9' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     27.21, 8.3, 8' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     27.13, 8.4, 5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     26.19, 8.4, 7' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     25.17, 8.1, 7' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     25.13, 8.2, 5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     24.70, 9.6, 3'.2 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     24.17, 8.1, 8' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     23.19, 8.1, 8' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     23.13, 8.5, 5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     22.84, 9.1, 3'.1 (W. Hasubick, Buchloe, Germany, 10-cm refractor);
     22.17, 8.1, 10' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     22.16, 8.3, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     21.13, 8.5, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     19.16, 8.5, 5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     17.13, 8.5, 5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     16.16, 7.9, 11' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     15.82, 8.5, 8' (K. Sarneczky, Piszkesteto, Hungary, 20x60 binoculars);
     15.17, 7.9, 13' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     15.13, 8.5, 5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     13.13, 8.6, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     10.13, 8.5, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
      4.43, 9.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.73, 9.9, 2'.6 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      2.18, 7.8, 12' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
Mar. 28.11, 8.5, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     25.15, 8.6, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     24.73, 9.9, 2'.2 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     24.13, 8.5, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     22.12, 8.5, 5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     21.44, 8.8, 4'.0 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     20.73, 10.1, 2'.0 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     20.17, 8.5, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     19.18, 8.1, 13' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     18.81, 8.7, 5'.5 (W. Hasubick, Buchloe, Germany, 10-cm refractor);
     15.82, 10.1, 3'.1 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     15.11, 8.4, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     14.86, 8.7, 3' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
      2.75, 9.0, 4' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
Feb. 28.85, 9.0, 4' (M. Lehky, Upice observatory, Czech Republic, 25x100 binoculars);
     20.46, 9.1, 4'.5 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector);
     19.95, 9.2, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     19.83, 9.3, 1'.5 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     19.11, 9.2, 3' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     14.79, 9.0, 4' (M. Lehky, Upice observatory, Czech Republic, 25x100 binoculars);
     13.10, 9.1, 3' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     12.75, 9.0, 4' (M. Lehky, Upice observatory, Czech Republic, 25x100 binoculars);
      5.74, 9.2, 3'.5 (M. Lehky, Upice observatory, Czech Republic, 25x100 binoculars);
Jan. 31.41, 9.0, 5'.5 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     25.84, 9.4, 1' (S. E. Shurpakov, Baran', Belarus, 6-cm refractor);
     19.14, 9.7, 2.5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     14.10, 9.7, 2.5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     12.07, 9.7, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
      5.78, 11.2, 1'.4 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      5.12, 9.6, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.66, 9.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Dec. 30.81, 10.2, 1'.8 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     27.92, 9.7, 4' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     17.16, 9.9, 2.5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     16.11, 9.8, 2' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
      4.75, 11.2, 1'.5 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      3.74, 10.4, 1'.1 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      3.04, 9.5, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      2.79, 11.1, 1'.4 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
Nov. 29.55, 10.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     23.19, 10.8, 1'.5 (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      5.75, 12.1, 1'.4 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      1.58, 11.0, 2'.2 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Oct. 31.74, 12.2, 1'.4 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     25.97, 9.4:, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     25.12, 11.0, 2'.5 (M. Lehky, Upice observatory, Czech Republic, 25x100 binoculars);
     24.12, 11.1, 2'.5 (M. Lehky, Upice observatory, Czech Republic, 25x100 binoculars);
     22.68, 11.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      9.75, 12.8, 1'.2 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      4.73, 12.6, 1'.8 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      1.15, 12.3, 0'.7 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
Sep. 29.06, 9.5, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     26.72, 12.6, 1'.5 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     18.74, 12.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      9.74, 11.6, 1'.8 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      9.73, 13.3, 1'.2 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      6.73, 12.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      6.72, 13.5, 1'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      4.17, 9.6, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.72, 13.6, 1'.5 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
Aug. 28.14, 8.8, 8' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     12.74, 13.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      5.14, 9.0, 6' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
      3.78, 14.8, 1'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      2.15, 8.7, 7' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
July 30.79, 13.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     30.15, 8.7, 7' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     25.75, 13.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr.  7.42, 14.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.85, 9.2, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Mar. 23.84, 10.7, 3'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      9.84, 12.3, 2'.3 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Feb. 16.41, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  2.44, 15.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Nov. 14.62, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct.  2.76, 16.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 18.78, 17.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  3.49, 18.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2017 U7 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Mar.  1.78, 15.8, 25" (H. Sato, Tokyo, Japan, remotely with 0.51-m astrograph + CCD at Siding Spring);
2019
Nov. 27.47, 16.5, & 5" (M. Mattiazzo Swan Hill, Vic., Australia, 28-cm reflector + CCD);
Sep. 30.17, 17.2, 20" (E. Guido, using a 0.6-m astrograph + CCD remotely  at El Sauce Observatory in Chile);
2018
Apr. 27.80, 18.2, 6" (H. Sato, remotely with a 0.51-m astrograph + CCD at Siding Spring);
 
 
COMET C/2017 Y2 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Sep. 20.17, 17.9, 0'.2 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     19.20, 17.7, 0'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Aug. 26.22, 17.4, 0'.5 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     19.51, 16.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     15.32, 19.0, 0'.3 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
 
 
COMET C/2018 A3 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Jan.  2.47, 17.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Oct.  2.64, 17.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug.  3.77, 17.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 19.68, 15.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Dec.  1.87, 16.3, 0'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
Oct. 13.10, 16.0, 0'.28 (S. E. Shurpakov, Baran, Belarus, 20-cm reflector + CCD);
      6.79, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June  2.56, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 25.60, 17.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb. 17.77, 17.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 20.74, 17.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2018 A6 (GIBBS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan.  2.06, 17.6, 18" (H. Sato, Tokyo, Japan, remotely with a 0.43-m astrograph + CCD at Mayhill, NM);
2020
Oct. 10.43, 16.8, 12" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD
Aug. 20.62, 16.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr. 25.81, 16.0, 25" (H. Sato, Tokyo, Japan, remotely with a 0.51-m astrograph + CCD at Siding Spring, NSW);
2018
Nov. 27.83, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr.  8.52, 17.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET P/2018 C1 (LEMMON-READ)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Mar. 17.58, 18.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb. 17.73, 18.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2018 C2 (Lemmon)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Aug. 17.49, 16.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 13.52, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  26.58, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     16.27, 16.4, -- (K. Yoshimoto, Yamaguchi, Japan, 0.43-m reflector + CCD; remotely at Mayhill, NM; stellar appearance);
Apr. 20.71, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     18.69, 17.0, -- (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD; stellar appearance);
     12.38, 16.8, -- (K. Yoshimoto, Yamaguchi, Japan, 0.50-m reflector + CCD, at Mayhill, NM; stellar appearance);
Mar. 20.48, 17.5, -- (K. Yoshimoto, Yamaguchi, Japan, 0.43-m reflector + CCD, at Mayhill, NM);
 
 
COMET C/2018 DO4 (LEMMON)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Jan.  1.49, 17.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Dec.  8.45, 16.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov. 15.59, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 22.70, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      9.63, 16.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 29.35, 17.5, 20" (E. Guido, using a 0.6-m astrograph + CCD remotely from El Sauce Observatory in Chile);
     24.82, 16.5, -- (Y. Mizuno, Kani, Aichi-ken, Japan, 0.32-m reflector + CCD);
 
 
COMET C/2018 E1 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Jan.  4.69, 18.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Dec. 13.77, 18.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June 14.35, 15.9, 15" (H. Sato, Tokyo, Japan, 0.51-m astrograph + CCD, remotely at Siding Spring, NSW);
 
 
COMET C/2018 EF9 (Lemmon)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
May  21.12, 11.5, 3'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     16.01, 11.8, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
 
 
COMET C/2018 F1 (GRAUER)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
May   4.75, 17.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Apr.  7.70, 18.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2018 F4 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Sep. 13.73, 14.8, 1'.0 (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
Aug. 20.79, 15.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr. 24.38, 13.9, 0'.7 (C. Wyatt, Walcha, NSW, Australia, 0.40-m reflector);
     22.38, 13.9, 1' (C. Wyatt, Walcha, NSW, Australia, 0.40-m reflector);
     19.38, 13.7, 0'.8 (C. Wyatt, Walcha, NSW, Australia, 0.40-m reflector);
Feb. 29.44, 13.9, 1'.0 (H. Sato, Tokyo, Japan, remotely with 0.51-m astrograph + CCD at Siding Spring);
 
 
COMET P/2018 H2 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
May  21.68, 18.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2018 K1 (Weiland)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
June  7.63, 14.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  26.80, 15.4, 0'.97 (K. Yoshimoto, Yamaguchi, Japan, 0.43-m reflector + CCD; remotely at Siding Spring);
 
 
COMET C/2018 L2 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Nov. 29.67, 18.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 14.71, 17.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 31.76, 16.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June 16.72, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  24.74, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.78, 14.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr. 12.80, 13.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.80, 14.4, 0'.6 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD + green channel);
Mar.  8.82, 12.6, 1'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD + green channel);
Feb.  2.85, 12.2, 1'.5 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD + green channel);
      1.85, 12.6, 1'.2 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD + green channel);
Jan. 27.37, 11.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     25.79, 9.3, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      6.78, 9.4, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.77, 9.3, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.36, 11.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Dec. 29.77, 9.7, 4'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     28.35, 11.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      9.38, 11.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      6.77, 9.2, 4'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.38, 11.7, 1'.3 (S. Yoshida, Gunma, Japan, 0.40-m reflector; low alt.);
Nov. 30.37, 11.3, 1'.3 (S. Yoshida, Gunma, Japan, 0.40-m reflector; low alt.);
     30.36, 11.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     24.35, 11.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      6.72, 9.8, 4' (M. Lehky, Upice observatory, Czech Republic, 20x100 binoculars);
      3.78, 9.1, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Oct. 30.74, 10.5, 1'.0 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     28.38, 11.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     21.38, 11.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      6.39, 11.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.82, 9.8, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
July 29.45, 14.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     13.48, 14.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June 11.49, 15.1, 35" (H. Sato, Tokyo, Japan, 0.51-m astrograph + CCD, remotely at Siding Spring, NSW);
 
 
COMET C/2018 M1 (CATALINA)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Aug.  9.66, 17.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2018 N1 (NEOWISE)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Oct.  6.38, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.81, 10.0, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Sep.  1.86, 9.3, 10' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Aug. 14.89, 8.9, 9' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      9.89, 8.8, 10' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      7.96, 9.2, 8' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      5.52, 10.6, 4'.7 (K. Yoshimoto, Yamaguchi, Japan, 180-mm-f.l. f/2.8 lens + CCD);
      4.46, 11.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.91, 8.5, 11' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
July 31.90, 8.5, 12' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     23.72, 10.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     22.09, 8.3, 15' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     18.19, 11.1, 3' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     18.11, 8.8, 12' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     16.81, 9.7:, 8' (M. Mattiazzo, Swan Hill, Vic., Australia, 25x100 binoculars);
     15.75, 11.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     15.25, 11.7, 3' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     13.72, 12.0, 1'.8 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     12.78, 11.5, 4'.5 (K. Yoshimoto, Yamaguchi, Japan, 0.43-m reflector + CCD; remotely at Siding Spring, NSW);
     10.10, 9.4, 12' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      9.82, 11.2:, 5' (M. Mattiazzo, Swan Hill, Victoria, Australia, 25x100 binoculars);
      8.69, 12.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.82, 12.0, 4' (M. Mattiazzo, Swan Hill, Victoria, Australia, Canon 60Da camera + 200-mm-f.l. lens; moonlight);
 
 
COMET C/2018 N2 (ASASSN)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Nov. 29.81, 14.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 25.38, 14.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 19.48, 13.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 31.48, 12.5, 0'.7 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     16.73, 12.8, 0'.6 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      1.53, 12.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Dec. 27.94, 11.5, 2' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
      3.73, 12.2, 1'.0 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      3.06, 11.1, 1'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Nov. 29.61, 11.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.51, 11.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.40, 11.8, 1'.8 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      1.56, 11.5, 2'.2 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Oct. 31.73, 11.9, 1'.9 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     29.75, 11.9, -- (M. Czepita, Szczecin, Poland, 0.15-m reflector + CCD);
     25.95, 11.3, 1'.3 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      9.73, 12.1, 2'.0 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      9.56, 11.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.73, 12.3, 1'.9 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
Sep. 29.02, 10.8, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     26.71, 12.3, 1'.9 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     25.49, 11.6, 1'.7 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     21.86, 11.5, 0'.9 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      9.70, 11.9, 1'.5 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      7.62, 12.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.27, 12.1, 1' (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
      6.71, 12.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      6.71, 12.5, 1'.8 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      4.02, 11.7, 1'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Aug. 29.67, 12.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     26.99, 11.6, 0'.7 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     16.74, 12.3, 0'.7 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     12.72, 12.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      5.12, 11.7, 1'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      3.71, 13.3, 1'.8 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      2.10, 11.7, 1'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.77, 13.2, 1'.3 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
July 30.14, 11.9, 1'.2 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     29.77, 13.4, 2'.0 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     29.71, 12.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June 16.76, 12.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     13.77, 13.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 27.39, 13.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.83, 12.9, 0'.8 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.38, 14.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Dec. 28.39, 14.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     15.41, 14.1, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
 
 
COMET P/2018 P3 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Jan.  2.41, 18.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Dec.  8.54, 17.6, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
Oct. 29.53, 16.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2018 P5 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Sep. 23.28, 19.3, 8" (H. Sato, Tokyo, Japan, remotely with 0.43-m astrograph + CCD);
 
 
COMET C/2018 R3 (Lemmon)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
July  5.92, 9.3, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
June 26.92, 9.5, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     16.47, 11.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.94, 8.5, 10' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
      3.76, 11.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  30.93, 10.1, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     26.74, 12.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     19.74, 13.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.76, 14.4, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
Apr. 12.78, 15.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2018 U1 (LEMMON)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Nov. 15.37, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct.  1.46, 16.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 25.20, 17.1, 0'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      3.22, 16.7, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Aug. 28.49, 16.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     25.26, 17.0, 0'.5 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     15.32, 16.9, 0'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     12.26, 16.8, 0'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     11.24, 16.7, 0'.5 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      7.28, 17.1, 0'.5 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
May  14.38, 17.3, 0'.38 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
2019
Nov.  9.44, 17.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep.  7.57, 17.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2018 V1 (Machholz-Fujikawa-Iwamoto)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Dec. 15.36, 12.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      9.36, 11.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      8.35, 11.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      6.76, 8.9, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Nov. 22.83, 8.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     18.19, 8.2, 3'.5 (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     17.19, 8.0, 4' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     16.24, 7.7, 6' (J. J. Gonzalez, Asturias, Spain, 25x100 binoculars);
     14.32, 7.8:, 4' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars; alt. 14 deg; clouds);
     14.32, 7.5:, 3' (W. Souza, Sao Paulo, Brazil, 0.10-m refractor);
     13.32, 8.0, 3' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars; alt. 13 deg;
     13.23, 8.0, 5' (J. J. Gonzalez, Asturias, Spain, 25x100 binoculars);
     12.32, 8.0:, 3' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars; comet near 6th-mag star; alt. 14 deg);
     10.49, 9.4, 2'.5 (A. Hale, Cloudcroft, NM, USA, 10x50 binoculars);
      9.84, 10.3, 4'.4 (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      9.22, 9.9, 4' (J. J. Gonzalez, Collada del Fresno, Asturias, Spain, 20-cm reflector; zodiacal light);
 
 
COMET C/2018 W2 (Africano)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Apr. 21.79, 17.5, 15" (H. Sato, Tokyo, Japan, remotely with a 0.51-m astrograph + CCD  at Siding Spring, NSW);
2019
Nov.  2.37, 10.7, 1'.7 (S. Yoshida, Gunma, Japan, 0.40-m reflector; moonlight, low alt.; close to 12th-mag star);
      1.39, 11.4:, 1'.8 (S. Yoshida, Gunma, Japan, 0.40-m reflector; moonlight, low alt.);
Oct. 22.54, 11.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.29, 8.8, 8' (M. Lehky, Upice observatory, Czech Republic, 20x100 binoculars);
      2.95, 8.7, 3' (W. Souza, Sao Paulo, Brazil, 15-cm reflector);
      2.59, 9.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 30.19, 8.4, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     30.12, 8.4, 8' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     28.96, 8.1, 6' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars);
     27.12, 8.6, 6' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     26.71, 9.6, 4'.8 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     25.50, 9.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     25.49, 9.2, 6'.5 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     24.83, 8.1, -- (Y. Mizuno, Kani, Aichi-ken, Japan, 0.32-m reflector + CCD);
     24.16, 8.4, 6' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     23.51, 7.8, -- (Y. Mizuno, Kani, Aichi-ken, Japan, 0.32-m reflector + CCD);
      9.72, 10.6, 2'.5 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      9.69, 9.6, 6' (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      6.72, 10.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.75, 10.3, 3'.7 (K. Yoshimoto, Yamaguchi, Japan, 180-mm-f.l. lens + digital camera);
      4.10, 9.8, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.72, 11.3, 2'.9 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
Aug. 30.46, 11.3, 3'.3 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector + CCD; remotely from Mayhill, NM, USA);
     30.01, 11.2, 1'.1 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     29.66, 11.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     28.05, 9.9, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     27.28, 10.1, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     25.30, 10.1, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     22.90, 9.8, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     21.79, 9.5, 2'.9 (W. Hasubick, Buchloe, Germany, 10-cm refractor);
     16.79, 11.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     16.76, 11.1, 1'.8 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     12.67, 11.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      5.09, 10.2, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      3.78, 12.2, 1'.9 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      2.11, 10.3, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.77, 12.7, 1'.5 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
July 30.03, 10.3, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     29.77, 11.9, 1'.5 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     25.67, 12.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     24.94, 10.4, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      6.10, 11.1, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
June 26.96, 12.7, 0'.6 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     26.74, 13.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.70, 14.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  23.72, 14.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.47, 15.4, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
Apr.  7.48, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb.  6.71, 16.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 13.78, 17.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Dec.  1.86, 18.5, 0'.3 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
 
 
COMET C/2018 Y1 (Iwamoto)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Nov. 16.67, 18.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 13.73, 17.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 16.74, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     12.76, 16.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.75, 16.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May   2.45, 14.5, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
Apr. 24.85, 13.0, 2'.5 (M. Lehky, Hradec Kralove, Czech Republic, 0.30-m reflector);
     20.43, 13.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.44, 12.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      6.43, 12.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.87, 9.8, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.81, 10.5, 3'.5 (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
Mar. 31.44, 11.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     30.80, 10.5, 3'.5 (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     29.78, 10.3, 4' (M. Lehky, Upice observatory, Czech Republic, 25x100 binoculars);
     28.81, 11.5, 0'.8 (W. Hasubick, Buchloe, Germany, 44-cm rreflector);
     28.78, 10.2, 4'.5 (M. Lehky, Upice observatory, Czech Republic, 25x100 binoculars);
     24.41, 11.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     23.86, 9.3, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     23.81, 9.9, 4'.9 (M. Lehky, Upice observatory, Czech Republic, 20x100 binoculars);
     22.78, 9.9, 4'.5 (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     16.53, 10.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     12.78, 9.6, 5' (M. Lehky, Upice observatory, Czech Republic, 20x100 binoculars);
     11.96, 8.7, 8' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
      9.87, 8.2, 10' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
      4.96, 8.6, 2' (W. Souza, Paranapanema, SP, Brazil, 15x70 binoculars);
      2.91, 7.5, 13' (J. J. Gonzalez, Asturias, Spain, 12x45 monocular);
Feb. 27.96, 7.8, 8' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     26.89, 7.8, 8' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     26.43, 8.0, 7' (Y. Nagai, Gunma, Japan, 20x100 binoculars);
     25.77, 7.5, 8' (M. Lehky, Upice observatory, Czech Republic, 20x100 binoculars);
     25.00, 6.8, 15' (J. J. Gonzalez, Leon, Spain, 12x45 monocular);
     23.51, 7.7, 15' (S. Yoshida, Ibaraki, Japan, 10x70 refractor);
     18.77, 7.1, 15' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     17.75, 7.0, 10' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars; moonlight);
     17.08, 6.9, 15' (M. Lehky, Upice observatory, Czech Republic, 12x60 binoculars);
     16.08, 6.9, 15' (M. Lehky, Upice observatory, Czech Republic, 12x60 binoculars);
     14.60, 7.1, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
     13.85, 7.3, 15'.4 (W. Hasubick, Buchloe, Germany, 9x63 binoculars);
     13.14, 5.5, 30' (J. J. Gonzalez, Leon, Spain, naked eye);
     12.91, 7.7, 13'.8 (W. Hasubick, Buchloe, Germany, 10x50 binoculars);
     12.85, 6.4, 15' (M. Lehky, Upice observatory, Czech Republic, 12x60 binoculars);
     12.03, 5.5, 30' (J. J. Gonzalez, Asturias, Spain, naked eye);
     11.03, 6.7, 8' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
     10.29, 6.2, 30' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     10.08, 6.7, 10' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
      9.25, 6.3, 30' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
      9.08, 6.8, 10' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
      8.59, 6.8, 12' (Y. Nagai, Gunma, Japan, 12x50 binoculars);
      8.17, 6.5, 25' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
      7.19, 7.1, 20' (M. Lehky, Upice observatory, Czech Republic, 12x60 binoculars);
      7.12, 6.7, 20' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
      6.04, 5.9, 30' (J. J. Gonzalez, Asturias, Spain, 12x45 monocular);
      3.10, 6.1, 35' (J. J. Gonzalez, Leon, Spain, 12x45 monocular; 3.5-deg tail in p.a. 300 deg);
      1.74, 8.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 29.70, 8.7, 6' (Y. Nagai, Gunma, Japan, 20x100 binoculars);
     29.56, 8.3, 8' (M. Mattiazzo, Swan Hill, Vic., Australia, 25x100 binoculars);
     24.79, 9.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     21.25, 9.3, 6' (M. Goiato, Arašatuba, Brazil, 0.22-m reflector; total lunar eclipse);
     21.22, 7.3, 15' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars; during lunar eclipse);
     18.80, 10.1, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
     17.80, 10.0, 4'.4 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD + green channel);
     15.70, 9.5, 5' (M. Mattiazzo, Swan Hill, Vic., Australia, 25x100 binoculars);
     14.26, 8.2, 10' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
     13.78, 10.1, 4'.6 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD + green channel);
     10.82, 10.6, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
      7.26, 8.9, 8' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      6.83, 11.6, 2'.4 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
      2.25, 9.2, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.84, 11.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Dec. 30.29, 10.9:, 1'.5 (M. Goiato, Arašatuba, Brazil, 0.22-m reflector; moonlight);
     28.84, 11.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET P/2018 Y2 (Africano)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Jan.  4.58, 18.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET P/2019 A2 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Jan. 13.68, 17.8, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
 
 
COMET C/2019 B1 (Africano)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Feb.  3.58, 17.3, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
Jan. 26.72, 17.6, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
 
 
COMET P/2019 B2 (Groeller)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Feb.  6.63, 18.7, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
 
 
COMET C/2019 C1 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Dec. 18.72, 17.9, 12" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
Mar. 14.60, 16.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.70, 16.9, 18" (H. Sato, Tokyo, Japan, remotely with 0.51-m astrograph + CCD at Siding Spring);
Jan. 11.69, 17.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2019 D1 (Flewelling)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Aug. 17.68, 17.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June 29.61, 16.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     26.70, 15.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     16.67, 14.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     13.69, 15.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.65, 14.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  31.10, 13.2, 0'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     16.71, 14.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.75, 14.8, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
Apr.  6.80, 15.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 23.80, 15.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2019 E3 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Apr. 27.44, 18.2, 12" (H. Sato, Tokyo, Japan, remotely with a 0.51-m astrograph + CCD  at Siding Spring, NSW);
 
 
COMET C/2019 F1 (Africano)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
June 14.20, 16.0, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     10.23, 16.1, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      9.22, 15.9, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      7.46, 15.8, 0'.2 (A. Pearce, Nedlands, W. Australia, 0.43-m reflector);
May  21.29, 16.2, 0'.3 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     16.29, 15.8, 0'.68 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     14.29, 15.8, 0'.53 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
2019
Apr. 12.65, 18.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2019 F2 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Mar.  1.77, 18.0, 12" (H. Sato, Tokyo, Japan, remotely with 0.51-m astrograph + CCD at Siding Spring);
2019
May  4.52, 17.1, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
 
 
COMET 380P/2019 G1 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Apr. 12.73, 18.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2019 J2 (Palomar)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
June 13.65, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  23.69, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     16.73, 16.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2019 J3 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
May  26.68, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2019 JU6 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
June  4.37, 18.5, 10" (H. Sato, Tokyo, Japan, remotely with 0.43-m astrograph + CCD);
 
 
COMET C/2019 K1 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Apr. 18.40, 17.1, 15" (H. Sato, Tokyo, Japan, remotely with a 0.51-m astrograph + CCD  at Siding Spring, NSW);
2019
June 13.54, 16.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  25.68, 16.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     24.66, 16.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2019 K4 (Ye)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Oct.  2.57, 16.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 29.67, 16.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 26.40, 16.3, 25" (H. Sato, Tokyo, Japan, remotely with 0.43-m astrograph + CCD);
 
 
COMET C/2019 K5 (Young)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Jan.  1.57, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Dec.  8.48, 16.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov. 15.64, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 31.61, 15.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 29.69, 15.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 30.74, 15.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2019 K6 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Apr. 25.5, 18.5, 5" (E. Guido, remotely with a 0.50-m astrograph at Siding Spring, NSW);
Mar. 20.78, 18.2, 12" (H. Sato, Tokyo, Japan, remotely with 0.51-m astrograph + CCD at Siding Spring, NSW);
2019
Aug. 20.38, 19.6, -- (H. Sato, Tokyo, Japan, remotely with 0.51-m astrograph + CCD at Siding Spring; stellar appearance);
 
 
COMET C/2019 K7 (Smith)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Oct.  1.43, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 25.24, 16.1, 0'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     23.20, 16.1, 0'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      3.20, 14.2, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Aug. 25.21, 16.1, 0'.3 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     15.26, 16.0, 0'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     12.22, 16.2, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     10.23, 16.0, 0'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      8.22, 16.3, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      2.54, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 12.91, [14.5, -- (W. Hasubick, Buchloe, Germany, 44-cm reflector);
June 15.33, 16.1, 0'.3 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     10.36, 16.2, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
2019
Aug. 10.61, 16.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep.  7.50, 16.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug.  2.66, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2019 K8 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Sep. 24.16, 19.5, -- (H. Sato, Tokyo, Japan, remotely with 0.43-m astrograph + CCD; stellar appearance);
Aug.  4.49, 18.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2019 L3 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan.  4.51, 13.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2020
Dec. 20.26, 14.0, 0'.9 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     19.29, 14.2, 1'.0 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     14.49, 14.0, 0'.5 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
      5.22, 14.3, 0'.9 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Oct. 24.75, 14.3, 1'.3 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     20.74, 14.5, 1'.5 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     15.64, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 24.36, 15.6, 0'.7 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     20.33, 15.5, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     19.32, 15.6, 0'.5 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Aug. 27.40, 15.3, 0'.5 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     12.58, 15.3, 0'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
     12.47, 15.7, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      9.48, 15.8, 0'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      2.65, 15.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.43, 15.8, 0'.7 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
July 12.92, [14.5, -- (W. Hasubick, Buchloe, Germany, 44-cm reflector);
June 10.46, 16.4, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Jan.  3.48, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Dec. 15.43, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET P/2019 LD2 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
June 26.64, 17.7, 8" (H. Sato, Tokyo, Japan, remotely with a 0.51-m astrograph + CCD at Siding Spring, NSW);
 
 
COMET P/2019 LM4 (Palomar)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
May  21.32, 18.9, 0'.33 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     16.36, 17.4, 0'.37 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
 
 
COMET P/2019 M2 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Sep. 24.28, 19.1, -- (H. Sato, Tokyo, Japan, remotely with 0.43-m astrograph + CCD; stellar appearance);
Aug. 30.47, 18.8, -- (H. Sato, Tokyo, Japan, remotely with 0.43-m astrograph + CCD; stellar appearance);
     25.24, 18.7, -- (H. Sato, Tokyo, Japan, remotely with 0.43-m astrograph + CCD; stellar appearance);
     10.67, 18.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     10.01, 18.5, -- (A. Sodor and K. Sarneczky. Piszkesteto, Hungary, 0.60-m Schmidt telescope + CCD);
      2.00, 18.1, -- (K. Sarneczky, Piszkesteto, Hungary, 0.60-m Schmidt telescope + CCD);
July 31.68, 18.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     25.72, 18.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2019 M3 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Sep.  6.58, 18.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2019 N1 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 23.27, 11.9, 1' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
2020
Dec. 25.86, 12.5, 2'.6 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     22.86, 12.8, 1'.5 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     19.85, 12.5, 2'.6 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     18.73, 12.7, 2'.2 (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
     16.85, 12.8, 1'.4 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
      3.82, 11.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov. 29.83, 12.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     14.83, 11.9, 3'.4 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
Sep.  8.41, 12.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 28.43, 12.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     13.89, 10.6, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
July 31.47, 13.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     24.92, 11.7, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     12.89, 13.5, 0'.6 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
June 15.29, 15.0, 0'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     14.29, 15.1, 0'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     12.21, 15.2, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     10.31, 15.1, 0'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      8.30, 14.8, 0'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD; involved with a bright star);
      7.23, 15.1, 0'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
May  21.87, 13.3, 0'.5 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
Mar. 12.69, 15.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb.  6.75, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 11.81, 15.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Nov. 30.82, 16.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.83, 16.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 24.17, 17.6, 12" (H. Sato, Tokyo, Japan, remotely with 0.43-m astrograph + CCD);
 
 
COMET C/2019 NJ3 (Lemmon)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Aug. 13.59, 17.9, 12" (H. Sato, Tokyo, Japan; remotely using a 0.51-m astrograph + CCD at Siding Spring);
 
 
COMET C/2019 O3 (Palomar)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Oct. 18.44, 16.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 25.26, 17.2, 0'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     20.25, 17.1, 0'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     19.29, 17.2, 0'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Aug. 26.24, 16.9, 0'.3 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     15.26, 16.6, 0'.3 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     13.61, 16.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 2I/2019 Q4 (Borisov)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Jan.  4.85, 15.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.84, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Dec. 27.84, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     27.55, 17.2, -- (J. Drummond, Patutahi, New Zealand, 41-cm reflector + CCD);
     14.84, 15.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.77, 15.0, 1'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
      4.77, 15.4, 1'.4 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
      2.79, 15.8, 0'.8 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
Nov. 29.79, 15.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     15.78, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      9.82, 15.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      8.78, 15.7, -- (T. Takahashi, Kurihara, Miyagi-ken, Japan, 0.25-m reflector + CCD);
      6.79, 15.6, -- (T. Ikemura, Shinshiro, Aichi-ken, Japan, 0.35-m reflector + CCD);
      5.74, 16.0, -- (T. Takahashi, Kurihara, Miyagi-ken, Japan, 0.25-m reflector + CCD);
      4.79, 15.8, -- (H. Sato, Sukagawa, Fukushima-ken, Japan, 0.25-m reflector + CCD);
      1.80, 15.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 22.76, 16.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     10.48, 16.7, 15" (H. Sato, Tokyo, Japan, remotely with 0.43-m astrograph + CCD);
      9.76, 16.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 26.79, 17.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     24.80, 16.5, -- (Y. Mizuno, Kani, Aichi-ken, Japan, 0.32-m reflector + CCD);
     18.77, 17.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     11.80, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2019 T2 (Lemmon)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Oct.  1.50, 15.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 20.25, 17.1, 0'.2 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Aug. 27.37, 16.6, 0'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     18.65, 16.8, 0'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
     13.71, 16.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June 28.32, 17.9, 10" (E. Guido, Castellammare di Stabia, Italy, 0.6-m astrograph + CCD at El Sauce, Chile);
 
 
COMET C/2019 T3 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan.  4.47, 16.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2020
Dec. 19.19, 16.5, 0'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Oct. 25.53, 16.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 20.41, 17.7, 0'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Aug. 28.54, 16.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  5.55, 18.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2019 T4 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 20.57, 14.6, 25" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
2020
Dec.  3.75, 15.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov.  9.79, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 30.80, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb. 20.48, 18.0, 8" (H. Sato, Tokyo, Japan, remotely with 0.51-m astrograph + CCD at Siding Spring);
 
 
COMET C/2019 T6 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Oct. 23.07, 19.2, 10" (L. Buzzi, Varese, Italy, 0.84-m reflector + CCD);
     19.34, 18.4, -- (R. S. McMillan, Kitt Peak, AZ, USA, 0.9-m reflector + CCD);
 
 
COMET C/2019 U6 (LEMMON)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Oct. 18.39, 13.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     15.81, 11.4, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     11.42, 14.3, 1'.4 (K. Yoshimoto, Kumage, Yamaguchi, Japan, 0.20-m reflector + CCD);
Sep. 25.16, 14.4, 2'.5 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     23.16, 13.6, 3'.0 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     21.44, 12.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     21.16, 13.2, 3'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     19.18, 13.6, 4'.0 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      7.89, 10.2, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      3.16, 12.6, 4'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Aug. 27.17, 12.7, 3'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     26.17, 12.8, 3'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     25.17, 12.6, 3'.2 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     15.19, 12.0, 3'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     13.92, 10.1, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     13.20, 11.7, 4'.1 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     12.53, 11.1, 3'.0 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
     12.20, 11.9, 4'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     11.20, 11.7, 3'.3 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     10.21, 11.6, 3'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      9.21, 11.8, 2'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      8.95, 10.5, 2'.5 (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      8.20, 11.7, 5'.2 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      7.20, 11,5, 4'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      6.92, 10.0, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      5.92, 9.8, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      4.92, 9.7, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      3.91, 9.6, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars; moonlight);
      2.91, 9.5, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars; moonlight);
      2.19, 11.4, 4'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      1.91, 9.5, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars; moonlight);
      1.20, 11.2, 3'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
July 31.91, 9.4, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     31.46, 9.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     30.91, 9.4, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     30.35, 9.3, 5'.4 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector; moonlight);
     29.91, 9.3, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     28.91, 9.3, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     27.92, 9.0:, 3' (W. Souza, Sao Paulo, Brazil, 0.09-m refractor);
     27.91, 9.2, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars; moonlight);
     26.43, 8.5, 5' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     25.91, 9.1, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binocular; moonlight);
     25.43, 8.5, 5' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     24.94, 8.2, 10' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     24.91, 9.0, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     24.42, 8.5, 6' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     23.93, 9.0, 4' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars; moonlight);
     23.92, 8.9, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     23.42, 8.4, 5' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     22.91, 8.9, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     21.92, 8.8, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     21.35, 8.4, 9' (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars);
     20.92, 8.4, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     20.88, 8.0, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     20.41, 8.2, 6' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     19.93, 8.7, 5' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     19.92, 8.4, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     19.41, 8.3, 6' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     19.36, 8.5, 9' (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars);
     18.92, 8.3, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     18.88, 7.8, 8' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     18.41, 8.3, 5' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     17.93, 8.5, 5' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     17.88, 7.7, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     17.83, 8.2, 4' (K. Yoshimoto, Yamaguchi, Japan, 20x100 binoculars);
     17.41, 8.2, 5' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     16.91, 8.2, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     16.88, 7.6, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     16.53, 8.6, 7'.5 (K. Yoshimoto, Yamaguchi, Japan, 0.08-m refractor + digital camera);
     16.46, 8.1, 6' (P. Camilleri, Katherine, NT, Australia, 20x80 Binoculars);
     15.91, 8.1, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     15.88, 7.8, 5' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; X Vir in coma);
     15.41, 8.0, 7' (P. Camilleri, Katherine, NT, Australia, 20x80 Binoculars);
     15.16, 7.7, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
     14.91, 8.1, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     14.88, 7.8, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     14.46, 8.0, 8' (P. Camilleri, Katherine, NT, Australia, 20x80 Binoculars);
     13.91, 8.1, 4' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     13.42, 7.9, 8' (P. Camilleri, Katherine, NT, Australia, 20x80 Binoculars);
     12.95, 7.9, 5' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     12.92, 8.0, 4' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     12.88, 7.6, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     12.87, 7.3, 2'.6 (W. Hasubick, Buchloe, Germany, 10-cm refractor);
     12.42, 7.8, 8' (P. Camilleri, Katherine, NT, Australia, 20x80 Binoculars);
     12.35, 7.8, 9' (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars);
     11.95, 7.8, 5' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     11.91, 8.0, 4' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     10.93, 7.7, 5' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     10.92, 7.9, 4' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      9.92, 7.9, 4' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      9.92, 7.5, 8' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
      9.83, 10.3, 1'.27 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter);
      9.44, 7.7, 7' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
      9.30, 8.1, 5'.0 (C. Stoitsis, Caulfield, Victoria, Australia, 20x80 binoculars);
      8.92, 7.6, 4' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
      8.91, 7.8, 4' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      8.30, 7.6, 6'.0 (C. Stoitsis, Caulfield, Victoria, Australia, 20x80 binoculars);
      7.92, 7.6, 6' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
      7.91, 7.4, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      7.91, 7.6, 4' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      7.44, 7.7, 6' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
      7.36, 7.8, 9' (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars);
      6.88, 7.0, & 5' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
      6.41, 7.8, 6' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
      6.36, 7.5, 7'.2 (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; moonlight);
      5.92, 7.5, 6' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars; moonlight);
      5.91, 7.4, 4' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      5.87, 7.5, 6' (C. Labordena, Castellon, Spain, 11x80 binoculars);
      4.92, 7.4, 6' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars; moonlight);
      4.91, 7.3, 4' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      4.91, 7.2, 6' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars; moonlight);
      3.92, 7.3, 5' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor; moonlight);
      3.91, 7.2, 5' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      3.80, 6.5, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; moonlight);
      3.37, 7.6, 9' (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; moonlight);
      2.96, 7.4, 5' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor; moonlight);
      2.80, 6.2, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; moonlight);
      2.44, 7.5, 5' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
      1.92, 7.0, 6' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
      1.91, 7.1, 5' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      1.90, 6.9, 8' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars; moonlight);
      1.82, 9.8, 1'.27 (T. Scarmato, Calabria, Italy, 25-cm reflector+ CCD + R_c filter; twilight);
      1.80, 6.2, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; moonlight);
June 30.93, 6.7, 6' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars; moonlight);
     30.80, 6.8, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; moonlight);
     30.42, 7.3, 4' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     30.35, 7.1, 8'.5 (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; moonlight);
     29.91, 7.0:, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     29.80, 6.8, 8' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; moonlight);
     29.36, 7.1, 9' (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; moonlight);
     28.91, 6.9, 6' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     28.80, 6.8, 8' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; moonlight);
     28.42, 7.1, 4' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     27.80, 6.7, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; moonlight);
     27.42, 6.9, 5' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     26.46, 6.8, 5' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     26.35, 7.0, 8' (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; moonlight);
     25.80, 6.7, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; moonlight);
     24.94, 6.5, 8' (M. Goiato, Aracatuba, Brazil 7x50 binoculars);
     24.92, 6.8, 8' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
     24.90, 6.8, -- (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     24.89, 6.4, 9' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
     24.80, 6.2, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; moonlight);
     23.90, 6.5, 9' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
     23.80, 6.2, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     22.89, 6.7, 6' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     22.42, 6.7, 5' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     21.92, 6.4, 8' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
     21.91, 6.6, 9' (W. Souza, Sao Paulo, Brazil, 15x70, binoculars);
     21.89, 6.5, 8' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     21.42, 6.6, 5' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     21.35, 6.7, 12' (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars);
     20.95, 6.2, 9' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     20.91, 6.5, 9' (W. Souza, Sao Paulo, Brazil, 15x70, binoculars);
     20.90, 6.4, 8' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     20.89, 6.4, 8' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
     20.42, 6.5, 6' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     19.93, 6.2, 9' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     19.91, 6.5, 8' (W. Souza, Sao Paulo, Brazil, 10x50, binoculars);
     19.90, 6.4, 6' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
     19.89, 6.4, 6' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     19.80, 6.1, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     19.43, 6.3, 7' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     19.36, 6.7, 9' (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars);
     18.80, 6.1, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     18.43, 6.2, 8' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     17.89, 6.3, 6' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     17.36, 6.5, 8' (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars);
     16.91, 6.2, 7' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     16.43, 6.6, 6' (A. Pearce, Nedlands, W. Australia, 0.1-m reflector);
     16.42, 6.2, 6' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     16.35, 6.4, 8'.5 (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars);
     16.35, 6.4, 11'.6 (H. Sato, Tokyo, Japan, 0.13-m refractor + CCD at Siding Spring);
     15.90, 6.3, 8' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     15.43, 6.6, 5' (A. Pearce, Nedlands, W. Australia, 0.1-m reflector);
     15.41, 6.2, 6' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     14.92, 6.2, 8' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     14.41, 6.2, 7' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     13.90, 6.2, 8' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     13.80, 6.2, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     13.41, 6.3, 7' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     12.90, 6.3, 8' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     12.80, 6.2, 8' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; same mag via naked eye);
     12.43, 6.4, 8' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     11.92, 6.1, 8' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars; thin clouds);
     11.80, 6.4, 6' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     11.35, 6.4, 8'.5 (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars);
      9.80, 6.4, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; seen via naked eye);
      9.43, 6.8, 5' (A. Pearce, Nedlands, W. Australia, 0.1-m reflector);
      9.43, 6.6, 6' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
      8.89, 6.4, 8' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
      8.89, 6.3, 5' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
      8.80, 6.6, 8' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; seen via naked eye);
      8.44, 6.8, 5'.5 (A. Pearce, Nedlands, W. Australia, 0.1-m reflector);
      8.43, 6.6, 7' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
      8.35, 6.9, 8' (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars);
      7.92, 6.5, 8' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
      7.91, 6.2, 5' (W. Souza, Sao Paulo, Brazil, 10x50 binoculars);
      7.90, 6.3, 6' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
      7.89, 6.4, 8' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
      7.80, 6.7, 8' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
      7.43, 7.0, 4'.5 (A. Pearce, Nedlands, W. Australia, 0.1-m reflector);
      7.42, 6.7, 6' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
      6.89, 6.2, 5' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
      6.35, 6.9, 7' (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; moonlight);
      5.42, 6.7, 4' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
      5.35, 6.8, 6' (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; moonlight);
      4.42, 6.7, 4' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
      4.36, 6.8, 6'.5 (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; moonlight);
      3.90, 6.5, 8' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars; moonlight);
      3.80, 6.4, 11' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; moonlight);
      3.35, 6.5:, 6'.3 (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; moonlight);
      2.80, 6.2, 11' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; moonlight);
      2.44, 6.8, 5' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
      1.90, 6.8, 8' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
      1.81, 6.5, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; moonlight);
      1.41, 6.8, 5' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
May  31.90, 6.9, 8' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     31.89, 6.7, 5' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars, moonlight);
     31.81, 6.5, 8' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; moonlight);
     31.42, 6.9, 4' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     30.93, 6.6, 8' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars; moonlight);
     30.91, 7.0, 8' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     30.90, 6.8, 5' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars; moonlight);
     30.81, 6.9, 8' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     30.43, 7.0, 4' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     30.35, 7.2, 6'.5 (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; moonlight);
     29.90, 7.0, 8' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     29.90, 6.8, 5' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars; moonlight);
     29.42, 6.9, 5' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     28.93, 6.7, 6' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars; moonlight);
     28.91, 7.0, 8' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     28.90, 6.8, 5' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars; moonlight);
     28.81, 6.9, 6' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; moonlight);
     28.43, 7.4, 5'.5 (A. Pearce, Nedlands, W. Australia, 0.1-m reflector);
     28.42, 7.0, 6' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     28.35, 7.4, 6'.3 (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; moonlight);
     27.93, 6.8, 5' (W. Souza, Sao Paulo, Brazil, 10x50 binoculars);
     27.90, 7.1, -- (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     27.90, 6.9, 6' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
     27.81, 7.1, 6' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     27.43, 7.3, 4'.5 (A. Pearce, Nedlands, W. Australia, 0.1-m reflector);
     27.35, 7.2, 5' (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; moonlight);
     26.90, 6.8, 6' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
     26.90, 7.0, -- (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     26.81, 7.0, -- (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     26.43, 7.0, 6' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     25.94, 6.9, 8' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars; alt. 23 deg);
     25.91, 7.0, 5' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     25.90, 6.8, 6' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
     25.81, 7.2, -- (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     25.42, 7.0, 7' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     24.81, 7.1, -- (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     24.42, 7.2, 8' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     23.92, 7.0, 5' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
     23.81, 7.2, -- (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     23.43, 7.5, 5' (A. Pearce, Nedlands, W. Australia, 0.1-m reflector);
     21.90, 7.4, -- (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     21.81, 7.4, -- (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     21.25, 7.5, 5'.9 (D. D. Balam, 0.15-m reflector + CCD + V filter on NEOSSat satellite);
     20.91, 7.5, 5' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     20.91, 6.9, 8' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
     20.81, 7.4, -- (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     20.19, 7.6, 5'.9 (D. D. Balam, University of Victoria, using the NEO Surveillance Satellite's 15-cm reflector + CCD);
     19.94, 7.4, 7' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     19.91, 7.5, 5' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     19.92, 7.1, 9' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
     18.91, 7.6, 5' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     18.91, 7.4, 5' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
     18.81, 7.5, -- (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     18.44, 7.6, 5' (A. Pearce, Nedlands, W. Australia, 0.1-m reflector);
     18.41, 7.5, 7' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     17.94, 7.4, 7' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     17.91, 7.6, 5' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     17.91, 7.4, 7' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
     17.81, 7.7, -- (S. J. O'Meara, Maun, Botswana, 7.6-cm refractor);
     17.36, 7.8, 8'.6 (C. Wyatt, Walcha, NSW, Australia, 10x50 monocular);
     16.94, 7.4, 6' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     16.92, 7.5, 4' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
     16.91, 7.6, 5' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     16.81, 7.8, -- (S. J. O'Meara, Maun, Botswana, 7.6-cm refractor);
     16.35, 7.9, 5'.2 (C. Wyatt, Walcha, NSW, Australia, 10x50 monocular);
     15.92, 7.5, 5' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars; close to bright star);
     14.91, 7.5, 5' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
     14.45, 7.7, 7' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     14.35, 8.0, 6'.4 (C. Wyatt, Walcha, NSW, Australia, 10x50 monocular);
     13.81, 7.9, -- (S. J. O'Meara, Maun, Botswana, 7.6-cm refractor);
     13.46, 7.9, 6' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     11.92, 7.8, 4' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     11.91, 7.7, 5' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
     11.81, 7.6, -- (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     11.45, 8.2, 5'.5 (A. Pearce, Nedlands, W. Austraiia, 0.1-m reflector);
     11.43, 7.8, 4' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     11.36, 8.2, 6' (C. Wyatt, Walcha, NSW, Australia, 10x50 monocular);
     10.93, 7.8, 6' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     10.92, 7.9, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     10.91, 7.8, 5' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
     10.45, 8.2, 5'.5 (A. Pearce, Nedlands, W. Austraiia, 0.1-m reflector);
     10.36, 8.1, 7'.3 (C. Wyatt, Walcha, NSW, Australia, 11x70 binoculars);
      9.92, 7.7, 5' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
      9.90, 7.8, 4' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      9.43, 8.0, 6' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
      8.91, 8.0, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      8.90, 7.9, 4' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor; close to bright stars);
      8.43, 8.7, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
      7.95, 7.9:, -- (A. Amorim, Florianopolis, Brazil, 0.09-m refractor; moonlight; alt. 20 deg);
      6.91, 7.9, 4' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor; moonlight);
      4.90, 8.3, 4' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor; moonlight);
      3.93, 8.5, 3' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor; moonlight);
      3.43, 8.9, 4' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
      2.90, 8.8, 3' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor; moonlight);
      2.45, 9.0:,3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
      1.45, 8.8, 3' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
Apr. 29.91, 9.2:, -- (A. Amorim, Florianopolis, Brazil, 0.09-m refractor; moonlight);
     28.92, 9.4:, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     28.44, 9.0. 4' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     27.43, 9.0, 4' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     26.93, 9.6, 4' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     25.43, 9.0, 3' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     25.37, 9.3, 5'.5 (C. Wyatt, Walcha, NSW, Australia, 0.25-m reflector);
     24.38, 9.3, 5' (C. Wyatt, Walcha, NSW, Australia, 0.40-m reflector);
     23.43, 9.5, 4' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     22.43, 9.5, 4' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     22.40, 9.6, 5'.3 (C. Wyatt, Walcha, NSW, Australia, 0.40-m reflector);
     22.36, 10.8, 4'.9 (H. Sato, Tokyo, Japan, remotely with a 0.51-m astrograph + CCD  at Siding Spring, NSW);
     20.43, 9.8, 3'.5 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     19.94, 10.3, 2' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     19.43, 10.0, 4' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     19.38, 10.4, 3'.8 (C. Wyatt, Walcha, NSW, Australia, 0.40-m reflector);
     18.46, 10.0, 5' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     17.39, 10.2, 4'.6 (C. Wyatt, Walcha, NSW, Australia, 0.25-m reflector);
     16.43, 10.2, 5' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     15.42, 10.4, 4'.2 (C. Wyatt, Walcha, NSW, Australia, 0.40-m reflector);
     14.43, 10.3, 5' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     14.40, 10.4, 4'.2 (C. Wyatt, Walcha, NSW, Australia, 0.25-m reflector);
     12.44, 10.6, 4' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     11.39, 10.5, 4'.8 (C. Wyatt, Walcha, NSW, Australia, 0.25-m reflector);
Mar. 22.44, 12.7, 2' (M. Mattiazzo, Swan Hill, Victoria, Australia, 20-cm reflector);
     15.12, 13.2, 1'.4 (A. Hale, Cloudcroft, NM, 41-cm reflector);
     14.43, 13.0, 2' (M. Mattiazzo, Swan Hill, Victoria, Australia, 20-cm reflector);
Feb. 20.47, 15.8, 40" (H. Sato, Tokyo, Japan, remotely at Siding Spring, 0.51-m astrograph + CCD);
     11.47, 16.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 24.55, 17.7, & 8" (M. Mattiazzo, Swan Hill, Australia, 28-cm reflector + CCD);
2019
Dec. 27.27, 18.8, & 5" (E. Guido, remotely at El Sauce, Chile, 0.6-m astrograph + CCD);
      6.70, 18.6, 12" (H. Sato, Tokyo, Japan, remotely at Siding Spring, 0.51-m astrograph + CCD);
 
 
COMET P/2019 V2 (Groeller)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Mar.  1.61, 19.5, 6" (H. Sato, Tokyo, Japan, remotely at Siding Spring with 0.51-m astrograph + CCD);
 
 
COMET C/2019 Y1 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
July 11.16, 18.0, 30" (H. Sato, Tokyo, Japan, remotely 0.43-m f/6.8 astrograph + CCD at Mayhill, NM);
June 22.44, 13.6, 1'.5 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     21.46, 13.6, 1' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     20.98, 11.5, 2' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     20.43, 13.5, 1' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     19.46, 13.5, 1' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     18.44, 13.6, 1' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     15.43, 13.6, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     14.42, 13.5, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     14.27, 15.3, 1'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     13.42, 13.6, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     12.47, 13.1, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     10.29, 14.5, 2'.0 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      9.46, 12.0, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
      8.29, 14.4, 2'.2 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      7.42, 12.0, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
May  29.44, 11.2, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     28.43, 11.0, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     26.45, 11.0, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     26.02, 9.8, 5' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     21.86, 10.9, 2'.0 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     18.09, 9.5, 5' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     15.24, 9.7, 6' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     14.26, 9.5, 6' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     13.56, 9.6, 4' (Y. Nagai, Saitama, Japan, 20x100 binoculars);
     12.15, 9.2, 3' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
      2.13, 8.2, 5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
Apr. 30.14, 8.0, 5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     27.13, 7.9, 5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     25.13, 8.0, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     24.70, 8.8, 3'.4 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     23.13, 7.9, 5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     22.83, 8.4, 2'.5 (W. Hasubick, Buchloe, Germany, 10-cm refractor);
     22.15, 8.0, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     21.13, 8.0, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     20.81, 8.0, 6' (K. Saneczky, Budapest, Hungary, 20x60 binoculars);
     19.15, 7.7, 5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     17.13, 7.4, 3' (C. Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
     15.81, 8.2, 5' (K. Sarneczky, Piszkesteto, Hungary, 20x60 binoculars);
     15.50, 8.9, 6' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     15.13, 8.4, 2' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     13.13, 8.6, 2' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     10.12, 8.4, 3' (C. Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
      4.78, 9.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.80, 8.9, 2'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
Mar. 26.81, 9.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     24.81, 9.8, 2'.2 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     20.83, 9.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     16.40, 9.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     15.11, 8.2, 2' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     14.83, 8.4, 3' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
Feb. 24.39, 10.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     20.43, 10.2, 2'.5 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector);
     19.81, 9.6, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     15.75, 11.4, 1'.3 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     15.39, 10.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     11.39, 11.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      9.38, 11.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.38, 11.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.08, 12.2, 1'.9 (H. Sato, Tokyo, Japan, remotely with a 0.43-m astrograph + CCD near Mayhill, NM, USA);
      1.39, 12.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 31.40, 11.4, 1'.4 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     13.38, 14.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.41, 14.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.39, 15.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET P/2019 Y2 (Fuls)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
May  14.24, 17.5, 0'.47 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Jan. 11.75, 17.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET P/2019 Y3 (Catalina)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Jan. 27.53, 19.9, -- (H. Sato, Tokyo, Japan, remotely with 0.43-m astrograph + CCD near Mayhill, NM, USA; stellar appearance);
      8.53, 19.1, 12" (H. Sato, Tokyo, Japan, remotely with 0.43-m astrograph + CCD near Mayhill, NM, USA);
 
 
COMET C/2019 Y4 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
May  18.14, 8.2, 4' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     13.15, 8.8, 3' x 7' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     12.82, 8.2, 15' (T. Scarmato, Calabria, Italy, 20x80 binoculars);
     12.15, 8.8, 3' x 8' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
      2.14, 9.3, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
Apr. 30.15, 8.9, 3' x 8' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     29.19, 9.0, 7' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     28.23, 9.0, 6' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars; involved with stars);
     27.24, 8.9, 9' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     26.22, 8.9, 9' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     25.21, 8.9, 10' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     25.14, 9.1, 3' x 6' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     24.70, 9.6, 5'.9 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     24.21, 8.8, 10' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     23.14, 9.2, 3' x 6 (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     22.85, 9.9, 6'.8 (W. Hasubick, Buchloe, Germany, 10-cm refractor);
     22.21, 8.9, 9' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     22.16, 9.4, 3' x 6' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     21.13, 9.4, 3' x 5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     16.92, 9.7  2'.5 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     19.16, 9.4, 3' x 5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     17.14, 9.2, 3' x 6' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     16.21, 8.5, 13' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     15.23, 8.4, 13' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     15.14, 9.1, 3' x 5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     14.23, 8.4, 13' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     13.14, 9.1, 6' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     11.19, 8.0, 13' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     10.13, 8.8, 8' (C. Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
     15.83, 9.0, 6' (K. Sarneczky, Piszkesteto, Hungary, 20x60 binoculars);
      5.48, 9.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.46, 9.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.72, 10.0, 3'.0 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      2.39, 8.0, 9' (C. Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
      2.22, 7.3, 15' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
      2.12, 7.8, 9' (M. Meyer, Limburg, Germany, 12-cm reractor);
      1.10, 7.8, 9' (M. Meyer, Limburg, Germany, 12-cm reractor);
Mar. 30.28, 8.0, 10' (C. Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
     30.23, 7.0, 19' (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars);
     29.90, 7.6, 10'.5 (M. Meyer, Limburg, Germany, 12-cm reractor);
     28.97, 7.9, 7' (T. Scarmato, Calabria, Italy, 7x50 binoculars);
     28.86, 7.5, 9'.5 (M. Meyer, Limburg, Germany, 12-cm reractor);
     28.13, 7.2, 15' (C. Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
     27.82, 7.6, 10'.5 (M. Meyer, Limburg, Germany, 12-cm reractor);
     26.71, 8.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     25.16, 8.0, 8' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     24.82, 7.6, 10'.5 (M. Meyer, Limburg, Germany, 12-cm reractor);
     24.72, 9.7, 3'.3 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     24.14, 7.9, 9' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     22.81, 7.7, 12' (M. Meyer, Limburg, Germany, 12-cm reractor);
     22.13, 7.9, 9' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     21.43, 8.9, 6'.5 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     20.72, 10.3, 2'.6 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     20.61, 9.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     20.17, 8.1, 8' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     19.81, 7.9, 13' (M. Meyer, Limburg, Germany, 12-cm reractor);
     19.21, 8.0, 15' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     18.80, 8.6, 4'.5 (W. Hasubick, Buchloe, Germany, 10-cm refractor);
     17.54, 9.1, 9'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + V filter + CCD);
     16.55, 9.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     15.83, 10.5, 3'.8 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     15.19, 9.3, 7'.5 (A. Hale, Cloudcroft, NM, 10x50 binoculars);
     15.12, 8.4, 9' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     14.85, 8.2, 12' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars);
     14.57, 9.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     12.64, 9.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     11.46, 10.2, 7'.0 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + V filter + CCD);
      5.77, 11.7, 2'.5 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      5.67, 11.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb. 29.72, 12.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     27.76, 13.2, 1'.3 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     23.77, 13.5, 1'.4 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     23.63, 13.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     22.84, 13.1, 1'.5 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     22.56, 13.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     19.94, 11.7, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     19.83, 13.7, 0'.6 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     10.68, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2020 A2 (IWAMOTO)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Feb. 21.46, [12.2, ! 1'.0 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
      5.77, 14.4, 1'.3 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     27.77, 12.2, 2'.0 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     23.78, 11.5, 2'.0 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     23.74, 12.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     22.84, 12.1, 2'.0 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     14.77, 11.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.20, 11.4, 1'.3 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      6.79, 11.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      6.54, 10.0, 2' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
      3.78, 10.7, 1'.7 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      1.77, 10.9, 1'.8 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
Jan. 31.83, 11.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     31.83, 10.9, 2'.8 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     31.77, 11.8, 1'.9 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     18.84, 13.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     17.23, 12.0, 1'.0 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     15.82, 13.4, 2'.0 (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2020 A3 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Jan.  1.68, 19.1, 8" (H. Sato, Tokyo, Japan, remotely with 0.51-m astrograph + CCD at Siding Spring);
     29.67, 18.7, 8" (H. Sato, Tokyo, Japan, remotely with 0.51-m astrograph + CCD at Siding Spring);
 
 
COMET C/2020 B3 (Rankin)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
      1.69, 19.3, 8" (H. Sato, Tokyo, Japan, remotely with 0.51-m astrograph + CCD at Siding Spring);
 
 
COMET C/2020 F2 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Apr. 25.71, 17.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2020 F3 (NEOWISE)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Sep.  8.43, 10.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.86, 8.9:, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      6.93, 9.2, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      6.93, 9.5, 3' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      6.43, 9.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      6.41, 10.9, 5'.5 (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD
      5.93, 9.2, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      4.92, 9.1, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      3.93, 9.0, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      2.93, 8.8, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      1.92, 8.7, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars; moonlight);
Aug. 30.92, 8.7, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     29.91, 8.5, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     28.91, 8.4, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     28.46, 8.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     27.15, 9.2, 7'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     26.15, 10.0, 7'.2 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     25.15, 10.8, 7'.0 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     21.89, 7.2, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     20.89, 7.2, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     19.89, 7.2, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     19.50, 7.7, 5' (K. Yoshimoto, Yamaguchi, Japan, 20x100 binoculars; 15' tail);
     18.89, 7.0, 8' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     18.17, 7.4, 11' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     17.17, 7.3, 11' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     16.79, 8.6, 1'.7 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter);
     16.17, 7.2, 10' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     15.89, 6.9, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; 1-deg tail);
     15.45, 7.5, 4' (Y. Nagai, Saitama, Japan, 20x100 binoculars);
     15.18, 7.1, 9'.5 (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     14.89, 6.6, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     14.18, 6.7, 10' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     13.91, 7.1, 7' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars; 1.2-deg tail);
     13.89, 6.6, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     13.18, 6.5, 10' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     12.89, 6.6, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     12.50, 6.5, 8'.5 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + V filter + CCD);
     12.19, 6.0, 10' (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars);
     11.92, 6.9, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     11.19, 6.7, 8' (C. S. Morris, Fillmore, CA, U.S.A., 20x80 binoculars);
     11.14, 6.7, 7' (C. Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
     10.95, 6.4, 4' (M. Goiato, Aracatuba, 7x50 binoculars);
     10.92, 6.8, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     10.89, 6.5, 10' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     10.19, 6.4, 9' (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars; 7-deg ion tail);
     10.14, 6.7, 7' (C. Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
      9.18, 6.3, 12' (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars; 8-deg ion tail);
      9.14, 6.7, 7' (C. Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
      8.94, 6.2, 5' (M. Goiato, Aracatuba, 7x50 binoculars);
      8.89, 5.7, -- (S. J. O'Meara, Maun, Botswana, naked eye);
      8.18, 5.9, 11' (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars; 10-deg ion tail);
      7.94, 6.1, 5' (M. Goiato, Aracatuba, 7x50 binoculars);
      7.92, 6.6, 5' (W. Souza, Sao Paulo, Brazil 15x70 binoculars);
      7.19, 6.4, 8' (C. Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
      7.18, 5.8, 11' (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars; 8-deg ion tail);
      6.92, 6.3, 5' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
      6.92, 6.3, 6' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      6.92, 6.0, 5' (M. Goiato, Aracatuba, 7x50 binoculars);
      6.89, 5.5, -- (S. J. O'Meara, Maun, Botswana, naked eye);
      6.19, 5.8, 11' (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars; 10-deg ion tail);
      6.15, 6.1, 8' (C. Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
      5.92, 6.0, 5' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
      5.91, 6.1, 5' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      5.89, 5.3, -- (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
      5.48, 5.8, 7' (K. Yoshimoto, Yamaguchi, Japan, 8x42 binoculars);
      5.45, 6.1, 6' (Y. Nagai, Saitama, Japan, 20x100 binoculars);
      5.18, 5.5, 11' (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars; 10-deg ion tail);
      5.14, 6.0, 8' (C. Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
      4.92, 5.8, 5' (M. Goiato, Aracatuba, 7x50 binoculars);
      4.91, 5.8, 5' (W. Souza, Sao Paulo, Brazil 15x70 binoculars);
      4.91, 5.9, 5' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      4.87, 5.3, -- (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; full moonlight);
      4.84, 5.7:, 5' (V. Gonano, Udine, Italy, 10x50 binoculars; moonlight);
      4.18, 5.8, 9' (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars; 12-deg ion tail; bright moon);
      3.93, 5.7, 4' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars; moonlight);
      3.92, 5.5, 5' (W. Souza, Sao Paulo, Brazil 15x70 binoculars);
      3.90, 5.7, 5' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars; moonlight);
      3.87, 5.3, -- (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; moonlight);
      3.83, 5.8, 6' (T. Scarmato, Calabria, Italy, 20X80 binoculars; moonlight);
      3.18, 5.8, -- (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars; 12-deg ion tail; bright moon);
      2.94, 5.6, 5' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars; moonlight);
      2.87, 5.2, -- (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; moonlight);
      2.47, 5.8, 6' (Y. Nagai, Saitama, Japan, 20x100 binoculars; 1-deg tail);
      2.18, 5.7, 8' (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars; 12-deg ion tail; bright moon);
      1.95, 5.5, 4' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars; moonlight);
      1.90, 5.3, 5' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars; 1.2-deg tail; moonlight);
      1.87, 5.2, -- (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; moonlight);
      1.18, 5.4, 9' (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars; 15-deg ion tail; bright moon);
      1.16, 5.3, 8' (C. Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
July 31.93, 5.3, 5' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars; moonlight);
     31.90, 5.1, 6' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars; 1-deg tail);
     31.87, 5.2, -- (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; moonlight);
     31.50, 5.0, 5' (K. Yoshimoto, Yamaguchi, Japan, 8x42 binoculars);
     31.19, 5.0, 10' (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars; 15-deg ion tail; bright moon);
     31.15, 4.9, 7' (C. Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
     30.90, 5.0, 6' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars; 1.2-deg tail);
     30.87, 4.6, -- (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; moonlight);
     30.49, 4.5, 7' (K. Yoshimoto, Yamaguchi, Japan, 8x42 binoculars; 1-deg tail);
     30.34, 5.2, 8' (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; moonlight; alt. 17 deg);
     30.19, 4.8, 9' (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars; 12-deg ion tail; bright moon);
     30.16, 4.9, 7' (C. Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
     29.90, 4.9, 6' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     29.87, 4.6, -- (S. J. O'Meara, Maun, Botswana, naked eye; 3-deg tail);
     29.53, 5.4, 10'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
     29.35, 5.0, 6'.4 (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; moonlight; alt. 14 deg);
     29.23, 4.9, 7' (C. Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
     29.19, 4.7, 10' (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars; 10-deg ion tail; bright moon);
     28.94, 4.7*, 6' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars; moonlight; alt. 16 deg);
     28.90, 4.8, 5' (W. Souza, Sao Paulo, Brazil, 10x50 binoculars);
     28.89, 4.7, 3' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars; 1-deg tail);
     28.87, 4.1, -- (S. J. O'Meara, Maun, Botswana, naked eye; 4-deg tail);
     28.83, 4.8, 6' (T. Scarmato, Calabria, Italy, 20X80 binoculars, 1-deg tail; moonlight);
     28.19, 4.4, 10' (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars; 10-deg ion tail; bright moon);
     27.93, 4.5*, 6' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars; moonlight; alt. 15 deg);
     27.90, 4.5, 4' (W. Souza, Sao Paulo, Brazil 10x50 binoculars);
     27.89, 4.5, 3' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars; 1-deg tail);
     27.85, 4.5, 7'.5 (W. Hasubick, Buchloe, Germany, 10x50 binoculars; 4.8-deg tail);
     27.21, 4.2, -- (C. S. Morris, Lockwood Valley, CA, U.S.A., 10x50 binoculars; 16-deg tail; bright moonlight);
     26.87, 3.7, -- (S. J. O'Meara, Maun, Botswana, naked eye; 6-deg tail and 5' coma in 8x42 binoculars);
     26.85, 3.2, 10' (T. Scarmato, Calabria, Italy, 7x50 binoculars; 2-deg tail; moonlight);
     26.41, 3.6, 3' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     26.20, 3.7*, -- (C. S. Morris, Fillmore, CA, U.S.A., naked eye; bright moonlight);
     25.91, 4.2, -- (W. Hasubick, Buchloe, Germany, 10x50 binoculars; 6.8-deg tail);
     25.91, 4.2*, 5' (W. Souza, Mairipora, Brazil, 15x70 binoculars; 1.5-deg tail);
     25.91, 4.0, 12' (K. Hornoch, Ondrejov, Czech Republic, 10x50 binoculars; 6-deg tail);
     25.90, 3.6, 13' (K. Hornoch, Ondrejov, Czech Republic, naked eye; 7-deg tail);
     25.89, 4.5, 3' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars; 1.7-deg tail);
     25.87, 3.8, -- (S. J. O'Meara, Maun, Botswana, naked eye; 4-deg tail and 5' coma in 8x42 binoculars);
     25.53, 4.5, -- (M.-T. Hui, Pubei, Guangxi, China, 8x42 binoculars; 2-deg tail; city lights, moonlight; cirrus);
     25.41, 3.3, -- (P. Camilleri, Katherine, NT, Australia, naked eye);
     25.20, 3.6*, -- (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars; moonlight);
     24.96, 4.3, 6' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars; 9-deg tail);
     24.92, 4.0, 5' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars; 4-deg tail; alt. 8 deg);
     24.90, 3.9*, 4' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars; 0.25-deg tail);
     24.89, 4.4, 3' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars; 2-deg tail);
     24.83, 2.7, 6' (T. Scarmato, Calabria, Italy, naked eye; 1-deg tail; haze; moonlight);
     24.53, 4.1, -- (M.-T. Hui, Pubei, Guangxi, China, 8x42 binoculars; 3-deg tail; city lights, moonlight; cirrus);
     24.41, 3.1, -- (P. Camilleri, Katherine, NT, Australia, naked eye);
     24.20, 3.3*, 10' (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars);
     23.91, 4.3*, 4' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars; alt. 7 deg);
     23.87, 3.3*, -- (S. J. O'Meara, Meno A Kwena, Botswana, 8x42 binoculars; alt. 10 deg);
     23.83, 2.4, 8' (T. Scarmato, Calabria, Italy, naked eye, 2-deg tail; haze);
     23.53, 4.1, -- (M.-T. Hui, Pubei, Guangxi, China, 8x42 binoculars; 2-deg tail; city lights, moonlight);
     23.41, 3.0, 2' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     23.20, 3.1*, -- (C. S. Morris, Fillmore, CA, U.S.A., naked eye; 24-deg tail);
     22.90, 3.4, 11' (K. Hornoch, Ondrejov, Czech Republic, 10x50 binoculars; 8-deg tail);
     22.89, 3.1, 12' (K. Hornoch, Ondrejov, Czech Republic, naked eye; 11-deg tail);
     22.82, 2.3, 8' (T. Scarmato, Calabria, Italy, naked eye; 3-deg tail; haze);
     22.20, 2.8, -- (C. S. Morris, Fillmore, CA, U.S.A., naked eye; 20-deg tail);
     21.83, 1.8, 25' (T. Scarmato, Calabria, Italy, naked eye; 7-deg tail);
     21.52, 3.3*, & 4' (K. Yoshimoto, Yamaguchi, Japan, 8x42 binoculars; tail > 5 deg long0;
     21.20, 2.8*, -- (C. S. Morris, Fillmore, CA, U.S.A., naked eye; 20-deg tail);
     21.09, 3.1, -- (D. W. E. Green, Gloucester, MA, USA, naked eye; 10-deg tail);
     20.91, 3.5, -- (J. J. Gonzalez Suarez, Alto del Castro, Aralla, Leon, Spain, naked eye; 12-deg tail);
     20.83, 2.0, 10' (T. Scarmato, Calabria, Italy, naked eye; 2-deg tail; haze);
     20.83, 3.7, -- (W. Hasubick, Buchloe, Germany, 10x50 binoculars; 4.0-deg tail);
     20.20, 2.6*, -- (C. S. Morris, Fillmore, CA, U.S.A., naked eye; 24-deg tail);
     19.89, 3.2, 9' (K. Hornoch, Ondrejov, Czech Republic, 10x50 binoculars; 7-deg tail; low alt., cirrus clouds);
     19.88, 2.9, 10' (K. Hornoch, Ondrejov, Czech Republic, naked eye; 8-deg tail; low alt., cirrus clouds);
     19.83, 1.9, 10' (T. Scarmato, Calabria, Italy, naked eye; 3-deg tail; haze);
     19.48, 3.3:, -- (S. Yoshida, Kanagawa, Japan, 10x66 refractor);
     19.46, 3.2, 8' (Y. Nagai, Saitama, Japan, 7x35 binoculars; 2-deg tail);
     19.19, 2.5*, -- (C. S. Morris, Castaic, CA, U.S.A., naked eye; 24-deg tail);
     18.83, 1.9, 10' (T. Scarmato, Calabria, Italy, naked eye; 3-deg tail; haze);
     18.46, 2.8, 7' (Y. Nagai, Saitama, Japan, 15x70 binoculars; 2-deg tail);
     18.19, 2.2*, -- (C. S. Morris, Castaic, CA, U.S.A., naked eye; 30-deg tail);
     17.93, 2.7, 8' (K. Hornoch, Ondrejov, Czech Republic, naked eye; 12-deg tail);
     17.91, 2.5:, -- (J. J. Gonzalez, Asturias, Spain, naked eye; 15-deg tail);
     17.84, 3.1, 2'.5 (K. Sarneczky, Balatonakali, Hungary, 8x42 binoculars; 6-deg dust tail);
     17.83, 1.7, 20' (T. Scarmato, Calabria, Italy, naked eye; 4-deg tail);
     17.19, 1.9*, -- (C. S. Morris, Castaic, CA, U.S.A., naked eye; 24-deg tail);
     16.84, 1.7, 20' (T. Scarmato, Calabria, Italy, naked eye; tail 4-deg tail);
     16.53, 2.8*, -- (M.-T. Hui, Mulan, Heilongjiang, China, naked eye; 3-deg tail; city light, haze and light fog);
     16.51, 1.6*, &2' (K. Yoshimoto, Yamaguchi, Japan, 8x42 binoculars; 5-deg tail);
     16.19, 1.5:*, -- (C. S. Morris, Castaic, CA, U.S.A., naked eye; 20-deg tail);
     16.08, 1.5:*, -- (D. W. E. Green, Gloucester, MA, USA, naked eye; 5-deg tail);
     15.84, 2.9, 2'.7 (K. Sarneczky, Balatonakali, Hungary, 8x42 binoculars; 8-deg dust tail);
     15.19, 1.6,* -- (C. S. Morris, Castaic, CA, U.S.A., 10x50 binoculars; 6-deg tail);
     15.14, 2.9:, 1' (C. Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
     15.05, 2.0, 3' (K. Sarneczky, Balatonakali, Hungary, naked eye; 13-deg dust tail);
     14.89, 2.4, 6' (K. Hornoch, Ondrejov, Czech Republic, naked eye; 12-deg tail);
     14.13, 2.5:, 1' (C. Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
     13.74, 1.7*, -- (M.-T. Hui, Shangzhi, Heilongjiang, China, naked eye; 15-deg tail; twilight and moonlight);
     13.50, 2.3:*, -- (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars; 4-deg tail; bright twilight);
     13.06, 1.4, -- (W. Hasubick, Buchloe, Germany, naked eye);
     13.04, 1.7, 3' (K. Sarneczky, Balatonakali, Hungary, naked eye; 14-deg dust tail);
     12.76, 1.7:*, -- (M.-T. Hui, Shangzhi, Heilongjiang, China, naked eye; 10-deg tail; twilight and moonlight);
     12.48, 2.3:, 1' (C. Hergenrother, Tucson, AZ, U.S.A., naked eye);
     12.17, 2.1:, 9' (V. Gonano, Udine, Italy, 10x50 binoculars; twilight);
     12.05, 1.3, -- (W. Hasubick, Buchloe, Germany, naked eye);
     12.03, 2.0, 7' (K. Hornoch, Ondrejov, Czech Republic, naked eye; 9-deg tail);
     11.49, 2.2:*, -- (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars; 4-deg tail; bright twilight);
     11.45, 1.9, -- (A. Hale, near Dunken, NM, USA, naked eye);
     11.04, 1.4, 3'.5 (K. Sarneczky, Balatonakali, Hungary, 8x42 binoculars; 7-deg dust tail);
     10.74, 1.1:*, -- (M.-T. Hui, Tangwang, Heilongjiang, China, naked eye; 6-deg tail; twilight and moonlight);
     10.49, 1.8:*, -- (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars; 4-deg tail; bright twilight; high clouds);
     10.13, 1.8*, 10' (T. Scarmato, Calabria, Italy, naked eye; twilight);
     10.10, 1.4*, 3' (R. Haver, Rome, Italy, 10x50 binoculars; 2.0-deg tail);
     10.07, 1.4, 3'.0 (W. Hasubick, Buchloe, Germany, 10x50 binoculars; 3-deg tail);
     10.05, 1.8, 7' (K. Hornoch, Ondrejov, Czech Republic, naked eye; 4-deg tail in p.a. 320 deg);
      9.50, 1.6*, -- (C. S. Morris, Fillmore, CA, U.S.A., naked eye; bright twilight);
      9.47, 1.7:, 1' (C. Hergenrother, Tucson, AZ, U.S.A., naked eye);
      9.37, 1.7*, -- (P. Creed, near Marshallville, OH, USA, naked eye; 1-deg tail);
      9.33, 1.5:*, -- (D. W. E. Green, Parker River NWR, MA, USA, 10x50 binoculars);
      8.50, 1.4*, -- (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars; 4.5-deg tail; bright twilight);
      8.48, 1.8:, & 1' (C. Hergenrother, Tucson, AZ, U.S.A., naked eye);
      8.36, 1.5*, -- (P. Creed, Canal Fulton, OH, USA, naked eye; 1-deg tail);
      8.15, 2.5:, 1' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars; 2.5-deg tail in p.a. 310 deg);
      8.10, 1.3*, 3' (R. Haver, Rome, Italy, 10x50 binoculars; approx. 2.0-deg tail);
      7.50, 1.3:*, -- (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars; 3-deg tail; bright twilight);
      7.14, 1.2, 3' (C. Labordena, Castellon, Spain, naked eye; 150' tail);
      6.50, 0.9:*, -- (C. S. Morris, Fillmore, CA, U.S.A., 10x50 binoculars; 3-deg tail; bright twilight);
      6.14, 1.1, 3' (C. Labordena, Castellon, Spain, naked eye; 100' tail);
      6.08, 1.4, -- (W. Hasubick, Buchloe, Germany, 10x50 binoculars; 1.2-deg tail);
      5.49, 1.4:, & 1' (C. Hergenrother, Tucson, AZ, U.S.A., naked eye);
      5.14, 1.6, 3' (C. Labordena, Castellon, Spain, 11x80 binoculars; 80' tail);
      5.07, 1.4:*, & 1' (M. Biely, Brno, Czech Republic, 20x80 binoculars; alt. 6 deg);
      5.06, 1.3, 8' (K. Hornoch, Vohancice, Czech Republic, naked eye; 0.4-deg tail);
      4.49, 1.7:*, 1' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
      3.49, 1.4*, 1' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars; alt. 7-8 deg; 0.3-deg tail);
      3.46, 0.6:*, -- (A. Hale, southern rural NM, USA, 10x50 binoculars);
      3.16, 2.5:, 0'.3 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; 0.1-deg tail);
      1.49, 1.0:, 1' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
June  6.34, 7.6, 5' (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; moonlight; twilight; alt. 7 deg);
      5.34, 7.5, 4' (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; moonlight; twilight; alt. 9 deg);
      4.34, 7.5, 4'.4 (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; moonlight; twilight; alt. 12 deg);
      3.34, 7.7, 4'.5 (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; moonlight; alt. 10 deg);
May  30.92, 7.3, 8' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars; alt. 16 deg; moonlight);
     30.41, 7.9, 4' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     30.35, 8.1, 5' (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; moonlight);
     29.41, 8.0, 4' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     28.92, 7.7, 8' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars; alt. 15 deg; moonlight);
     28.81, 7.7, -- (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; moonlight);
     28.90, 8.1, 2' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     28.35, 8.1, 5'.6 (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; moonlight);
     27.91, 8.3, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     27.89, 8.2, 3' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
     27.81, 7.6, 8' (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     27.35, 8.4, 6'.6 (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; moonlight);
     26.91, 8.3, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     26.89, 8.2, 3' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
     25.92, 8.0, 10' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars; alt. 19 deg);
     25.91, 8.4, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     25.89, 8.5, 3' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
     24.41, 8.0, 8' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     23.91, 8.6, 3' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
     20.90, 8.9, 3' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
     19.93, 9.1, 6' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     19.90, 8.9, 3' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
     18.91, 9.2, 2' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
     18.42, 8.7, 6' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     17.93, 9.2, 4' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     17.90, 9.1, 3' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
     17.37, 9.2, 5'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     16.93, 9.5, 3' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector; near a star of mag 10.5);
     16.91, 9.6:, -- (A. Amorim, Florianopolis, Brazil, 0.09-m refractor; close to bright star);
     16.35, 9.1, 4'.2 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     15.90, 9.7, 2' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
     14.90, 9.6, 2' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
     14.46, 9.3, 8' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     14.36, 9.7, 5' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     13.47, 9.5, 8' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     11.90, 9.8, 2' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
     11.45, 10.3, 2' (A. Pearce, Nedlands, W. Austraiia, 0.25-m reflector);
     11.44, 9.5, 4' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     11.38, 9.8, 5'.2 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     10.95, 10.0, 3' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     10.45, 10.6, 2' (A. Pearce, Nedlands, W. Austraiia, 0.25-m reflector);
     10.37, 9.9, 4'.6 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      9.91, 9.8, -- (A. Amorim, Florianopolis, Brazil, 0.09-m refractor);
      9.44, 9.5, 5' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
      8.44, 10.0, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
      3.45, 10.1, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
      2.46, 10.3, 5' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
      1.46, 10.1, 4' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
Apr. 28.46, 10.2, 6' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     27.45, 10.0, 4' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     27.43, 12.1, 3'.3 (H. Sato, Tokyo, Japan, remotely with a 0.51-m astrograph + CCD at Siding Spring, NSW);
     26.94, 11.3, 2' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     25.45, 10.3, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     25.43, 12.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     25.38, 10.3, 6' (C. Wyatt, Walcha, NSW, Australia, 0.25-m reflector);
     24.40, 10.8, 4'.9 (C. Wyatt, Walcha, NSW, Australia, 0.40-m reflector);
     23.44, 10.5, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     22.45, 10.3, 5' (C. Wyatt, Walcha, NSW, Australia, 0.40-m reflector);
     22.44, 10.5, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     21.94, 11.8, 1' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     20.44, 11.0:,3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     19.46, 11.6, 4' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     19.39, 11.4, 3'.2 (C. Wyatt, Walcha, NSW, Australia, 0.40-m reflector);
     18.47, 12.0, 5' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     16.44, 12.6, 5' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     15.43, 11.0:, 4'.3 (C. Wyatt, Walcha, NSW, Australia, 0.40-m reflector);
     14.45, 13.0, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     12.45, 13.2, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     11.38, 13.5, 0'.7 (C. Wyatt, Walcha, NSW, Australia, 0.25-m reflector);
 
 
COMET C/2020 F5 (MASTER)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Nov. 15.45, 15.0, 0'.3 (C. Wyatt, Walcha, NSW, Australia, 40-cm reflector);
     14.44, 14.8, 0'.3 (C. Wyatt, Walcha, NSW, Australia, 40-cm reflector);
June  6.55, 16.0, 0'.1 (A. Pearce, Nedlands, W. Australia, 0.5-m reflector);
Apr. 24.65, 15.6, 18" (H. Sato, Tokyo, Japan, remotely with a 0.51-m astrograph + CCD at Siding Spring, NSW);
     22.44, 15.4, 0'.3 (C. Wyatt, Walcha, NSW, Australia, 0.40-m reflector);
     15.45, 15.3, 0'.5 (C. Wyatt, Walcha, NSW, Australia, 0.40-m reflector);
 
 
COMET C/2020 F8 (SWAN)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
June  1.93, 8.0:, 4'.1 (W. Hasubick, Buchloe, Germany, 10-cm refractor);
May  26.12, 6.8, 4' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     20.47, 6.2, 5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     19.46, 6.0, 5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     18.46, 5.9, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     18.13, 5.7, 6' (J. J. Gonzalez, Asturias, Spain, 25x100 binoculars);
     18.07, 6.2, 7'.5 (W. Hasubick, Buchloe, Germany, 10-cm refractor);
     17.46, 5.8, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     14.46, 5.6:, 5' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     13.83, 5.5, 3' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     13.46, 5.7, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     12.47, 5.7, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
     12.36, 5.8, 8' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars; moonlight; alt. 13 deg);
     12.35, 5.7, 8' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
     12.29, 6.0, -- (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; 0.5-deg tail);
     11.79, 5.7, 8'.5 (C. Wyatt, Walcha, NSW, Australia, 10x50 monocular; alt. 8 deg);
     11.36, 5.7, 7' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars; moonlight; alt. 15 deg);
     11.35, 5.9, 7' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     11.35, 5.8, 8' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
     11.29, 5.9, -- (S. J. O'Meara, Maun, Botswana, 8x42 binoculars);
     10.82, 5.8, 4' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     10.36, 5.8, 6' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     10.35, 5.8, 8' (W. Souza, Sao Paulo, Brazil, 7x50 binoculars);
     10.29, 5.7, -- (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; 0.5-deg tail);
      9.81, 5.3, 5' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
      9.47, 6.6, -- (D. D. Balam, Victoria, BC, Canada, NEOSSat 14-cm reflector + CCD + V filter; 95% of visible coma included in photometry aperture);
      9.35, 5.7, 8' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars; moonlight);
      9.35, 5.6, 8' (W. Souza, Sao Paulo, Brazil, 7x50 binoculars);
      9.35, 5.6, 6' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
      9.3, 5.6, -- (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; 0.5-deg tail);
      8.36, 5.5, 6' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
      8.3, 5.7, -- (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; 1-deg tail);
      7.78, 5.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.12, 5.7, -- (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; 1.5-deg tail; full moon);
      6.82, 5.6, 5' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
      6.79, 6.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      6.79, 5.5, 5' (C. Wyatt, Walcha, NSW, Australia, 10x50 monocular);
      6.12, 5.8, -- (S. J. O'Meara, Maun, Botswana, 8x42 binoculars; 2-deg tail);
      5.81, 5.5, -- (P. Camilleri, Katherine, NT, Australia, naked eye);
      5.48, 5.6:, 4' (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
      5.35, 5.2, 10' (W. Souza, Sao Paulo, Brazil, 8x42 Binoculars);
      5.35, 5.3, 8' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
      5.35, 5.1, 10' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
      5.12, 5.2, -- (S. J. O'Meara, Maun, Botswana, naked eye);
      4.82, 5.5, 8' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
      4.79, 6.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.79, 5.7, 8'.5 (C. Wyatt, Walcha, NSW, Australia, 10x50 monocular);
      4.36, 5.0, 10' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
      4.35, 5.1, 8' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
      4.35, 5.0, 10' (W. Souza, Sao Paulo, Brazil, 8x42 binoculars);
      4.12, 5.1, -- (S. J. O'Meara, Maun, Botswana, naked eye);
      3.75, 5.6, 9' (C. Wyatt, Walcha, NSW, Australia, 10x50 monocular);
      3.35, 5.0, 8' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
      3.34, 4.8, -- (M. Goiato, Aracatuba, Brazil, naked eye);
      3.12, 5.1, -- (S. J. O'Meara, Maun, Botswana, naked eye; 5-deg tail faint w/ averted vision);
      2.88, 5.2, 6' (A. Pearce, Nedlands, W. Australia, 0.1-m reflector);
      2.83, 5.0, 10' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
      2.35, 5.0, 8' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
      2.35, 4.8, -- (M. Goiato, Aracatuba, Brazil, naked eye);
      2.33, 5.1, 10' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
      2.12, 4.9, -- (S. J. O'Meara, Maun, Botswana, naked eye; 7-deg tail);
      1.84, 5.0, -- (P. Camilleri, Katherine, NT, Australia, naked eye);
      1.35, 4.8, -- (M. Goiato, Aracatuba, Brazil, naked eye);
      1.35, 5.1, 10' (W. Souza, Sao Paulo, Brazil, 8x42 binoculars);
      1.34, 5.1, 8' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
      1.12, 5.0, -- (S. J. O'Meara, Maun, Botswana, naked eye; 1-deg tail);
Apr. 30.88, 5.4, 6' (A. Pearce, Nedlands, W. Australia, 0.1-m reflector);
     30.35, 5.2, 8' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     30.35, 5.1, 10' (W. Souza, Sao Paulo, Brazil, 10x50 binoculars);
     29.87, 5.5, 6' (A. Pearce, Nedlands, W. Australia, 0.1-m reflector);
     29.75, 5.4, 8'.5 (C. Wyatt, Walcha, NSW, Australia, 10x50 Monocular);
     29.35, 5.2, 10' (W. Souza, Sao Paulo, Brazil, 8x42 binoculars);
     29.35, 5.3, 8' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     29.31, 5.6, 9' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     28.85, 5.6, 4'.5 (A. Pearce, Nedlands, 0.1-m reflector);
     28.82, 5.8, -- (P. Camilleri, Katherine, NT, Australia, naked eye);
     28.76, 5.6, 7' (C. Wyatt, Walcha, NSW, Australia, 10x50 Monocular);
     28.35, 6.1, 6' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     28.35, 5.9, 8' (W. Souza, Sao Paulo, Brazil, 8x42 binoculars);
     28.31, 5.9, 9' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     27.82, 6.0, -- (P. Camilleri, Katherine, NT, Australia, naked eye);
     27.35, 6.3, 8' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     27.35, 6.4, 6' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     27.35, 6.3, 8' (W. Souza, Sao Paulo, Brazil, 10x50 binoculars);
     26.82, 6.5, 8' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     26.35, 6.6, 6' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     26.35, 6.6, 8' (M. Goiato, Aracatuba, Brazil, Brazil, 7x50 binoculars);
     26.34, 6.9, 6' (W. Souza, Sao Paulo, Brazil, 10x50 binoculars);
     25.82, 7.1, 4' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     25.75, 7.2, 10' (C. Wyatt, Walcha, NSW, Australia, 10x50 Monocular);
     25.35, 7.0, 5' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
     25.33, 6.8, 5' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     24.82, 7.2, 4' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     24.75, 7.3, 9' (C. Wyatt, Walcha, NSW, Australia, 10x50 Monocular);
     24.33, 7.1, 5' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     23.83, 7.3, 5' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     23.35, 7.3, 7' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     23.33, 7.2, 5' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     22.83, 7.3, 4' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     22.76, 7.7, 5'.5 (C. Wyatt, Walcha, NSW, Australia, 0.25-m reflector);
     22.76, 7.7, 10' (C. Wyatt, Walcha, NSW, Australia, 7x50 Binoculars);
     22.33, 7.3, 5' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     22.32, 7.5, 4' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);=
     21.83, 7.3, 4' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     21.79, 7.6, 9' (C. Wyatt, Walcha, NSW, Australia, 10x50 Monocular);
     21.35, 7.2, 4' (W. Souza, Sao Paulo, Brazil, 10x50 binoculars);
     20.82, 7.6, 5' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     20.35, 7.5, 5' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
     20.35, 7.4, 7' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     20.33, 7.4, 4' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     19.82, 7.6, 5' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     19.33, 7.5:, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars; moonlight);
     18.82, 7.6, 4' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     18.71, 8.1, 4'.5 (C. Wyatt, Walcha, NSW, Australia, 0.25-m reflector);
     18.34, 7.6, 4' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars; moonlight);
     18.33, 7.8, 5' (W. Souza, Sao Paulo, Brazil, 0.15-m reflector);
     17.34, 7.7, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars; moonlight);
     17.33, 7.8, 4' (W. Souza, Sao Paulo, Brazil, 0.15-m reflector);
     16.82, 7.8, 5' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     16.79, 8.2, 3.3' (A. Pearce, Nedlands, W. Australia, 0.1-m refractor);
     16.34, 7.9, 5' (W. Souza, Sao Paulo, Brazil, 0.15-m reflector);
     15.82, 7.8, 5' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     15.79, 8.4, 3' (A. Pearce, Nedlands, W. Australia, 0.1-m refractor);
     14.82, 7.8, 5' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     14.79, 8.4, 2.8' (A. Pearce, Nedlands, W. Australia, 0.1-m refractor);
     13.81, 7.8, 4' (P. Camilleri, Katherine, NT, Australia, 0.08-m refractor);
     13.79, 8.2, 2'.5 (A. Pearce, Nedlands, 0.1-m refractor);
     13.34, 7.8, 3' (J. Guilherme de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     12.75, 7.9, 3'.7 (C. Wyatt, Walcha, NSW, Australia, 0.25-m reflector);
     12.35, 8.1, 3' (J. Guilherme de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     12.34, 8.1, 4' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor; moonlight);
     11.73, 8.0, 4' (C. Wyatt, Walcha, NSW, Australia, 0.25-m reflector);
 
 
COMET P/2020 G1 (Pimentel)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
May  21.18, 17.0, 0'.42 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     16.19, 16.6, 0'.47 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     11.35, 16.4, 25" (H. Sato, Tokyo, Japan, 0.51-m astrograph + CCD, Siding Spring, NSW);
      3.14, 16.5, 18" (H. Sato, Tokyo, Japan, remotely with a 0.43-m astrograph + CCD at Mayhill, NM, USA);
      1.18, 16.2, 0'.60 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Apr. 30.45, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     25.47, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     24.40, 15.6, 0'.2 (C. Wyatt, Walcha, NSW, Australia, 0.40-m reflector);
     23.45, 15.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     22.37, 15.6, 18" (H. Sato, Tokyo, Japan, remotely with a 0.51-m astrograph + CCD at Siding Spring, NSW);
     19.44, 14.5, 0'.5 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     19.40, 15.0, 0'.4 (C. Wyatt, Walcha, NSW, Australia, 0.40-m reflector);
     18.44, 14.5, 0'.5 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     18.37, 16.0, 0'.15 (A. Pearce, Nedlands, W. Australia, 0.43-m reflector);
     15.41, 15.1, 0'.3 (C. Wyatt, Walcha, NSW, Australia, 0.40-m reflector);
 
 
COMET C/2020 H2 (Pruyne)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
May  14.43, 15.4, 1'.1 (H. Sato, Tokyo, Japan, remotely from Mayhill, NM, USA, 0.43-m astrograph + CCD);
      2.81, 13.0, 1'.5 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
      1.83, 13.2, 1'.3 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
Apr. 29.81, 13.0, 1'.5 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     29.73, 14.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     28.78, 13.3, 0'.7 (C. Wyatt, Walcha, NSW, Australia, 0.25-m reflector);
     28.46, 12.5, 4'.7 (C. Hergenrother, Tucson, AZ, remotely with a 0.1-m f/5 astrograph + CCD at Mayhill, NM, USA);
     28.44, 13.5, 2'.9 (H. Sato, Tokyo, Japan, remotely with a 0.43-m astrograph + CCD at Mayhill, NM, USA);
     28.43, 13.2, 1'.4 (A. Hale, Cloudcroft, NM, USA, 41-cm reflector);
     27.81, 13.0, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
 
 
COMET C/2020 H5 (Robinson)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Dec. 18.72, 18.1, 15" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
 
 
COMET C/2020 H6 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 20.74, 17.4, 12" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
 
 
COMET C/2020 H7 (Lemmon)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
July 11.15, 20.4, -- (H. Sato, Tokyo, Japan, remotely 0.43-m f/6.8 astrograph + CCD at Mayhill, NM; stellar appearance);
 
 
COMET C/2020 J1 (SONEAR)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 20.75, 14.4, 18" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
2020
Aug. 26.43, 14.8, 35" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD);
June 15.74, 16.2, 0'.11 (A. Pearce, Nedlands, W. Australia, 0.5-m reflector);
 
 
COMET C/2020 K3 (Leonard)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
June 28.92, 18.3, 10" (E. Guido, Castellammare di Stabia, Italy, 0.5-m reflector + CCD at Pianillo, Italy);
 
 
COMET C/2020 K8 (Catalina-ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Aug. 20.78, 14.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     18.80, 14.3, 0'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
      9.46, 13.3, 0'.7 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      1.45, 16.6, 0'.7 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
July 24.14, 15.6, 0'.9 (K. Yoshimoto, Yamaguchi, Japan, 0.32-m reflector + CCD; remotely at Nerpio);
 
 
COMET C/2020 M3 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 18.78, 13.2, 1'.7 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     18.23, 13.7, 2'.5 (H. Sato, Tokyo, Japan, remotely w/ 0.43-m astrograph + CCD at Mayhill, NM, USA);
     16.85, 10.5, 4' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     13.83, 10.3, 5' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     13.79, 13.0, 1'.8 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
      7.89, 10.5, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
2020
Dec. 25.77, 11.4, 2'.8 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     22.79, 11.6, 2'.2 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     21.22, 11.9, 2'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     20.32, 11.4, 4'.2 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     19.79, 10.9, 2'.8 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     19.77, 11.5, 1'.1 (W. Hasubick, Buchloe, Germany, 10-cm refractor);
     19.27, 11.8, 2'.3 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     18.46, 10.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     16.81, 9.7, 6' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     16.79, 10.4, 3'.4 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     15.29, 11.3, 3'.1 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     14.50, 10.3, 2'.9 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
      9.12, 8.5, 7' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
      8.96, 9.6, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      5.23, 10.9, 2'.9 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Nov. 26.12, 8.5:, -- (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector; moonlight, clouds);
     25.10, 8.5, 3' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector; moonlight);
     24.11, 8.5, 3' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector; moonlight);
     23.10, 8.4, 3' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector; moonlight);
     22.28, 7.7, 12' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     22.12, 8.2, 4' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars; moonlight);
     22.07, 8.0, 3' (W. Souza, Sao Paulo, Brazil, 0.15-m reflector);
     21.77, 8.3, 6'.3 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     21.66, 7.5, 20' (K. Yoshimoto, Kumage, Yamaguchi, Japan, 0.20-m reflector + CCD);
     21.52, 8.6, 4'.5 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     21.07, 8.1, 4' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     20.14, 7.9, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     20.12, 7.6, 12' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     18.00, 7.2, 15' (J. J. Gonzalez, Asturias, Spain, 10x50 binoculars);
     17.13, 7.8, 5' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     17.08, 8.4, 3' (W. Souza, Sao Paulo, Brazil, 0.15-m reflector);
     16.74, 8.2, 7'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     15.50, 7.7, 9'.3 (C. Wyatt, Walcha, NSW, Australia, 10x50 refractor);
     15.16, 7.4, 14' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     15.13, 7.7, 5' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     14.76, 7.9, 11'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     14.60, 8.3, 9' (Y. Nagai, Saitama, Japan, 20x100 binoculars);
     14.52, 7.6, 12'.5 (C. Wyatt, Walcha, NSW, Australia, 10x50 refractor);
     14.24, 7.7, 13' (J. J. Gonzalez, Asturias, Spain, 25x100 binoculars);
     13.75, 8.1, 7'.4 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     10.70, 7.6, 20'.6 (K. Yoshimoto, Yamaguchi, Japan, 180-mm-f.l. lens + digital camera);
     10.47, 8.1, 8' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector; alt. 18 deg);
      9.12, 7.9, 5' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
      8.13, 7.7, 5' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
      8.13, 7.6, 6' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
      7.12, 7.3, 18' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
      7.11, 7.7, 5' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      6.10, 7.9, 5' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binocular);
      6.08, 7.7, 12' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
      4.09, 8.0, 5' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars; moonlight);
      2.70, 9.1, 6'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector; moonlight);
Oct. 28.16, 8.1, 5' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     26.17, 8.1, 10' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars; moonlight);
     24.75, 8.7, 9'.0 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     23.16, 8.4, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     22.29, 8.5, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     21.29, 8.7, 4' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     20.74, 8.3, 9'.7 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     18.29, 8.8, 4' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     18.17, 8.6, 7' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     17.29, 8.9, 4' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     17.21, 8.8, 5' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     16.14, 8.3, 9' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     14.22, 9.0, 4' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     13.21, 9.0, 4' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     12.71, 9.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     12.25, 8.9, 5' (M. Goiato, Aracatuba, Brazil 0.22-m reflector);
     12.21, 9.1, 4' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     11.20, 9.3, 4' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     11.08, 8.9, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     10.21, 9.3, 3' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
      1.74, 10.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 29.21, 10.3, 3' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     27.20, 10.4, 3' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     26.29, 10.2, 4' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     26.21, 10.5, 3' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     25.15, 10.6, 3' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     24.21, 10.3, 3' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     24.14, 10.5, 2' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     21.76, 11.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     13.73, 11.8, 4'.3 (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
      8.74, 12.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 28.76, 11.4, 5' (M. Mattiazzo, Swan Hill, Vic., Australia, 20-cm reflector);
     28.75, 12.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     13.77, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 15.74, 18.0, 8" (H. Sato, Tokyo, Japan; remotely using a 0.51-m astrograph + CCD at Siding Spring);
      1.63, 18.1, 10" (A. Valvasori, Padulle, Italy, 0.50-m reflector + CCD at Siding Spring);
June 30.77, 18.8, 0'.2 (K. Yoshimoto, Yamaguchi, Japan, 0.50-m reflector + CCD; remotely at Siding Spring);
 
 
COMET C/2020 M5 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Dec. 16.46, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 25.41, 17.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2020 N1 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan.  1.49, 15.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2020
Dec. 20.24, 16.7, 0'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     19.72, 14.3, 0'.4 (W. Hasubick, Buchloe, Germany, 10-cm refractor);
      3.45, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 25.59, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2020 N2 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Sep. 15.38, 20.1, 8" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD);
Aug. 24.47, 19.5, 12" (H. Sato, Tokyo, Japan; remotely using a 0.51-m astrograph + CCD at Siding Spring);
July 18.58, 17.3, 0'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.50-m reflector + CCD; remotely at Siding Spring);
 
 
COMET C/2020 O2 (Amaral)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Sep.  7.40, 17.6, 10" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD
 
 
COMET P/2020 O3 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Aug. 11.27, 20.3, -- (H. Sato, Tokyo, Japan, remotely 0.43-m f/6.8 astrograph + CCD at Mayhill, NM; stellar appearance);
 
 
COMET C/2020 P1 (NEOWISE)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Sep. 24.91, 10.7, -- (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     23.91, 10.6, -- (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     15.38, 14.9, 30" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD
Sep.  6.40, 15.2, 30" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD
Aug. 26.44, 16.5, 15" (H. Sato, Tokyo, Japan; remotely using a 0.51-m astrograph + CCD at Siding Spring);
 
 
COMET C/2020 P3 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 10.59, 17.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2020
Oct. 25.68, 18.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 19.63, 18.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2020 Q1 (Borisov)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
Sep. 12.71, 15.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep.  8.78, 14.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 28.77, 15.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 24.70, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 19.47, 15.8, 35" (H. Sato, Tokyo, Japan, remotely 0.43-m f/6.8 astrograph + CCD at Mayhill, NM);
C/2020 Q1



2020
Sep. 20.37, 14.8, 2'.2 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     19.39, 14.9, 2'.2 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      7.92, 10.8, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Aug. 19.73, 15.8, 0'.8 (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     18.78, 16.3, 0'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
 
 
COMET C/2020 Q2 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Aug. 24.49, -- (H. Sato, Tokyo, Japan; remotely using a 0.51-m astrograph + CCD at Siding Spring; stellar appearance);
 
 
COMET C/2020 R4 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan.  7.77, 9.5, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      3.37, 13.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.37, 12.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2020
Dec. 28.39, 13.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     26.38, 13.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     25.40, 12.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     21.36, 12.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     16.78, 10.7, 4' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     16.71, 12.0, 0'.9 (W. Hasubick, Buchloe, Germany, 10-cm refractor);
     11.46, 14.1, 1'.7 (K. Yoshimoto, Kumage, Yamaguchi, Japan, 0.50-m reflector + CCD);
     11.44, 14.2, 3'.0 (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
Oct. 18.55, 17.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2020 R7 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 15.52, 18.2, 12" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
2020
Dec. 11.44, 18.3, 6" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
 
 
COMET C/2020 S2 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan.  2.08, 19.9, -- (H. Sato, Tokyo, Japan, remotely with a 0.43-m astrograph + CCD at Mayhill, NM; stellar appearance);
 
 
COMET C/2020 S3 (Erasmus)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Dec.  9.32, 5.6, 1' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars; alt. 5 deg);
Nov. 27.85, 6.7*, 4' (K. Yoshimoto, Yamaguchi, Japan, 20x100 binoculars);
     27.28, 7.1, 6' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     26.30, 7.1, 4' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
     26.28, 7.1, 7' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     25.28, 7.2, 7' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     24.86, 7.1, 4'.7 (K. Yoshimoto, Yamaguchi, Japan, 180-mm-f.l. lens + digital camera);
     24.28, 7.3, 7' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     23.85, 6.8, 4' (K. Yoshimoto, Yamaguchi, Japan, 8x42 binoculars);
     23.29, 7.3, 5' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     23.28, 7.1, 5' (W. Souza, Sao Paulo, Brazil, 10x50 binoculars);
     22.30, 7.2, 5' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     22.30, 7.3, 5' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     21.87, 7.6, 4'.1 (K. Yoshimoto, Kumage, Yamaguchi, Japan, 0.20-m reflector + CCD);
     21.84, 7.3, 7'.0 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     21.83, 6.9, 3' (S. Yoshida, Ibaraki, Japan, 10x70 refractor);
     21.30, 7.2, 3' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
     21.30, 7.4, 5' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     20.32, 7.6, 4' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     20.30, 7.3, 5' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     20.30, 7.4, 3' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
     18.24, 6.8, 8' (J. J. Gonzalez, Asturias, Spain, 10x50 binoculars);
     17.29, 7.6:, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     16.83, 7.7, 7'.4 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     15.70, 7.7, 3'.8 (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; alt. 14 deg);
     15.32, 7.8, 6' (J. G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars);
     15.30, 7.8, 4' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     14.76, 8.6, 5'.7 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     14.23, 6.9, 8' (J. J. Gonzalez, Asturias, Spain, 10x50 binoculars);
     13.85, 7.6, -- (K. Yoshimoto, Yamaguchi, Japan, 8x42 binoculars);
     13.76, 8.6, 4'.0 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
      9.83, 9.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      8.32, 10.1, 2' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
      7.30, 10.0, 3' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
      6.30, 9.9, 4' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
      4.30, 10.0, 4' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
      3.31, 10.0, 4' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
      2.69, 10.1, 2' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector; moonlight);
Oct. 28.31, 10.1, 3' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     25.32, 9.9, 4' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     24.81, 10.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     23.30, 10.7, 2' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     22.30, 10.9, 2' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     21.30, 11.0, 2' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     20.75, 11.1, 3'.0 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     18.74, 11.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     18.31, 11.2, 2' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     16.21, 10.1, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     12.79, 12.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 21.80, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET P/2020 S6 (Leonard)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 18.45, 18.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2020 T2 (Palomar)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 10.71, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2020
Dec. 15.73, 16.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET P/2020 T3 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan.  2.07, 17.0, 10" x 18" (H. Sato, Tokyo, Japan, remotely with a 0.43-m astrograph + CCD at Mayhill, NM);
2020
Oct. 11.60, 20.7, -- (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD; stellar appearance);
 
 
COMET P/2020 U2 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan.  4.11, 15.6, 1'.5 (H. Sato, Tokyo, Japan, remotely with a 0.43-m astrograph + CCD at Mayhill, NM);
 
 
COMET C/2020 U3 (Rankin)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan.  1.06, 19.0, 15" (H. Sato, Tokyo, Japan, remotely with a 0.43-m astrograph + CCD at Mayhill, NM);
 
 
COMET C/2020 V2 (ZTF)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 13.72, 18.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2020
Dec. 28.76, 18.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET P/2020 V4 (Rankin)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 15.53, 19.0, 8" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
     13.59, 18.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2020 X2 (ATLAS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan.  9.60, 18.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2020
Dec. 15.64, 18.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2021 A1 (Leonard)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 15.53, 18.6, 8" (H. Sato, Tokyo, Japan, remotely w/ 0.43-m astrograph + CCD at Mayhill, NM, USA);
     10.75, 18.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2021 A2 (NEOWISE)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 25.57, 11.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     23.21, 10.8, 3' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      8.58, 11.9, 2' (M. Mattiazzo, Swan Hill, Victoria, Australia, 20-cm reflector);
      6.50, 12.8, 1' (M. Mattiazzo, Swan Hill, Victoria, Australia, 20-cm reflector);
 
 
COMET C/2021 A4 (NEOWISE)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 18.70, 17.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET C/2021 A7 (NEOWISE)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 20.58, 16.7, 18" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
 
 
COMET 2P/Encke
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Sep.  7.39, 17.4, 12" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD
Aug. 20.43, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     19.43, 14.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      8.97, 10.9, 2' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      6.93, 10.1, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      5.93, 9.9, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      4.93, 9.6, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      3.92, 9.6, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars; moonlight);
      1.92, 9.4, 2' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars; moonlight);
July 31.92, 9.4, 2' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     30.92, 9.3, 2' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     30.36, 10.2, 4'.6 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector; moonlight);
     29.92, 9.2, 2' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     28.92, 9.2, 2' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     27.92, 9.0, 1' (W. Souza, Sao Paulo, Brazil, 0.09-m refractor);
     27.91, 9.1, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars; moonlight);
     25.91, 9.1, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     24.91, 9.1, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     24.41, 9.2, 3' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     23.92, 9.2, 4' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars; moonlight);
     23.91, 9.0, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     23.41, 9.0, 3' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     22.91, 8.8, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     21.91, 8.7, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     21.34, 9.2, 4'.3 (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; twilight);
     20.91, 8.5, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     20.41, 8.6, 3' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     19.92, 8.6, 3' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     19.91, 8.5, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     19.41, 8.5, 3' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     19.35, 8.8, 5'.5 (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars);
     18.90, 8.4, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     18.41, 8.5, 3' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     17.92, 8.6, 3' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     17.41, 8.3, 3' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     16.90, 8.4, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     16.44, 8.2, 3' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     15.90, 8.3, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     15.41, 8.1, 3' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     14.90, 8.2, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     13.90, 8.0, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     13.41, 8.0, 3' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     12.90, 7.9, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     12.41, 8.0, 2' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     12.34, 8.4, 3'.5 (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; twilight; alt. 16 deg);
     11.90, 7.5, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     10.92, 7.9, 2'.5 (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     10.90, 7.8, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      9.90, 7.7, 2' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor; alt. 15 deg);
      9.41, 7.8, 2' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
      9.30, 7.8, 1'.8 (C. Stoitsis, Caulfield, Victoria, Australia, 20x80 binoculars; alt. 9 deg);
      8.89, 7.7, 1' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
      8.30, 7.8, 1'.5 (C. Stoitsis, Caulfield, Victoria, Australia, 20x80 binoculars);
      7.91, 7.6*, 3' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars; twilight; alt. 14 deg);
      7.35, 7.8, 3'.4 (C. Wyatt, Walcha, NSW, Australia, 15x70 binoculars; twilight; alt. 7 deg);
      6.41, 7.6, 1' (P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
      6.34, 7.8, 1'.3 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector; moonlight; twilight; alt. 10 deg);
      5.91, 7.5*, 3' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars; twilight; alt. 12 deg);
      4.90, 7.5, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      4.89, 7.8:, 1' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor; alt. 11 deg; moonlight)
      3.89, 7.9:, 1' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor; alt. 11 deg; moonlight)
      3.43, 7.3, 1' (A. Pearce, City Beach, W. Australia, 0.2-m reflector);
      1.89, 7.5:, 1' (A. Amorim, Florianopolis, Brazil, 0.09-m refractor; alt. 8 deg; moonlight)
June 30.34, 7.3, 0'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector; alt. 4 deg);
     29.33, 7.5, (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector; moonlight; twilight; alt. 5 deg);
2019
Sep. 24.29, 19.5, -- (H. Sato, Tokyo, Japan, remotely with 0.43-m astrograph + CCD; stellar appearance);
2017
July 18.65, 17.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June  2.75, 16.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr.  1.87, 9.6, 4'.5 (A. Pearce, Nedlands, W. Australia, 0.1-m reflector);
Feb. 31.87, 9.6, 3'.5 (A. Pearce, Nedlands, W. Australia, 0.2-m reflector);
     30.36, 8.9:, 2' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars; twilight; sun alt. -11 deg);
     26.88, 8.3, 3'.5 (A. Pearce, Nedlands, W. Australia, 0.1-m reflector);
     26.35, 7.7, 2' (W. Souza, Sao Paulo, Brazil, 0.09-m refractor);
     25.35, 7.4, 3' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars; twilight; alt. 16 deg);
     24.87, 7.9, 4' (A. Pearce, Nedlands, W. Australia, 0.1-m reflector);
     24.35, 7.2, 3' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars; twilight; alt. 14 degrees);
      4.39, 8.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     27.76, 7.9, 2'.0 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     25.40, 9.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     24.83, 8.4, 2'.0 (J. J. Gonzalez, Leon, Spain, 10x50 binoculars; alt. 8 deg);
     22.83, 8.4, 2'.0 (J. J. Gonzalez, Asturias, Spain, 10x50 binoculars; alt. 11 deg);
     19.41, 10.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     18.43, 9.0, 4' (K. Yoshimoto, Yamaguchi, Japan, 26x100 binoculars);
     16.82, 9.2, 3' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars; alt. 16 deg);
     16.77, 9.2, 2'.1 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     16.75, 8.8, 4'.8 (M. Lehky, Upice Observatory, Czech Republic, 20x100 binoculars);
     15.74, 9.0, 5' (M. Lehky, Upice Observatory, Czech Republic, 20x100 binoculars);
     15.74, 9.3, -- (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     15.43, 9.6, 3' (K. Yoshimoto, Yamaguchi, Japan, 26x100 binoculars);
     14.74, 9.2, 5' (M. Lehky, Upice Observatory, Czech Republic, 20x100 binoculars);
     13.74, 9.2, 5' (M. Lehky, Upice Observatory, Czech Republic, 20x100 binoculars);
     13.43, 9.7, 3' (K. Yoshimoto, Yamaguchi, Japan, 26x100 binoculars);
     11.40, 10.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.41, 11.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 28.75, 12.8, 1'.1 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     28.37, 12.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     24.39, 12.2, 1'.7 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     21.41, 12.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     19.79, 11.1, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.44, 14.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
Dec. 31.72, 13.8, 2'.0 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     29.43, 14.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     28.43, 14.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     26.82, 11.5, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     10.46, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov.  3.46, 17.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.47, 17.3, 0'.5 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
2013
Nov. 20.86, 9.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     19.85, 8.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     19.54, [6.9, 1' (Carl Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     17.84, 9.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     17.24, 8.1, 1'.7 (T. Lehmann, Weimar, Germany, 6-cm telephoto lens + CCD via DSLR green);
     17.23, [7.8, -- (B. H. Granslo, Roverkollen, Oslo, Norway, 8.0-cm refractor; alt. 3 deg, twilight);
     16.84, 8.2, -- (S. Yoshida, Mt. Tsukuba, Ibaraki, Japan, 0.40-m reflector; low alt. haze);
     14.52, 7.7, 2' (Carl Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
     14.24, 8.0, 2' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
     13.42, 8.1, -- (D. W. E. Green, Nelson Island, MA, 20x80 binoculars; highly condensed, very small coma);
     13.24, 8.3, 2' (N. Biver, Pico Veleta, Spain, 0.20-m reflector; twilight, strongly condensed);
     13.22, 7.9, 2' (B. H. Granslo, Roverkollen, Oslo, Norway, 8.0-cm refractor; alt. 7 deg; twilight);
     12.22, 8.0:, & 1' (A. Kammerer, St. Leon-Rot, Germany, 0.20-m reflector);
     12.22, 8.3, 3'.5 (T. Lehmann, Weimar, Germany, 6-cm telephoto lens + CCD via DSLR green);
     11.85, 7.7, 3' (K. Yoshimoto, Yamaguchi, Japan, 20x100 binoculars);
     11.24, 7.5, 3' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
     11.22, 8.0:, 2'.5 (B. H. Granslo, Roverkollen, Oslo, Norway, 8.0-cm refractor);
     10.84, 8.0, 3' (K. Yoshimoto, Yamaguchi, Japan, 20x100 binoculars);
     10.52, 7.7, 4' (Carl Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
      8.83, 7.5, & 4' (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
      8.52, 7.3, 5' (Carl Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
      8.18, 6.6, 3' (T. Karhula, Vasteras, Sweden, 10x50 binoculars);
      7.51, 6.7, 10' (Carl Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
      7.21, 7.4:, 8' (J. J. Chambo, Valencia, Spain, 20x60 binoculars; light pollution; low alt.);
      6.24, 6.9, 10' (J. J. Gonzalez, Asturias, Spain, 10x50 binoculars);
      5.82, 8.9, 4'.2 (Y. Nagai, Niigata, Japan, 300-mm camera lens + CCD);
      5.20, 7.5, 3'.0 (A. Kammerer, St. Leon-Rot, Germany, 0.20-m reflector);
      4.84, 7.5, 6' (K. Yoshimoto, Yamaguchi, Japan, 20x100 binoculars);
      4.50, 7.3, 8' (Carl Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
      4.42, 7.6, 4' (D. W. E. Green, Nelson Island, MA, U.S.A., 20x80 binoculars);
      1.49, 7.8, 9' (Carl Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
      1.16, 7.2, 4'.2 (M. L. Paradowski, Lublin, Poland, 6.8-cm refractor + CCD + V filter; twilight; alt. 21 deg);
Oct. 31.22, 7.4, 10' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars);
     31.21, 8.4, 5' (U. Pilz, Leipzig, Germany, 32-cm reflector);
     31.18, 8.0, 2'.0 (A. Kammerer, St. Leon-Rot, Germany, 0.30-m reflector);
     31.17, 8.1, 8' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     31.17, 8.0, 5' (A. Scholten, Eerbeek, Netherlands, 15x80 binoculars; alt. 15 deg);
     30.53, 7.8, 7' (Carl Hergenrother, Tucson, AZ, U.S.A., 10x50 binoculars);
     29.84, 8.3, 6' (K. Yoshimoto, Yamaguchi, Japan, 20x100 binoculars);
     27.18, 8.0, 7' (A. Scholten, Eerbeek, Netherlands, 15x80 binoculars; moonlight);
     23.16, 7.5, 2'.2 (M. L. Paradowski, Lublin, Poland, 6.8-cm refractor + CCD + V filter; twilight and moonlight);
     19.16, 8.6, 12' (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     16.51, 8.3, 7' (Carl Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     16.18, 7.9, 13' (J. J. Gonzalez, Asturias, Spain, 10x50 binoculars);
     14.15, 8.3:, 14' (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     14.09, 8.6, 9' (B. H. Granslo, Steinbruvann, Oslo, Norway, 8.0-cm refractor);
     13.78, 9.4, 3'.4 (Y. Nagai, Niigata, Japan, 0.32-m reflector);
     13.75, 8.4, 8' (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     12.99, 8.4, 9' (B. H. Granslo, Hakadal, Norway, 10.0-cm refractor);
     12.83, 9.0, 7' (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector);
     12.75, 8.5, 7'.5 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     12.13, 8.8, 4'.5 (A. Kammerer, St. Leon-Rot, Germany, 0.30-m reflector);
     11.74, 8.3, 7' (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     11.49, 9.1, 4' (C. W. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     11.07, 9.3, 7' (B. H. Granslo, Steinbruvann, Oslo, Norway, 8.0-cm refractor);
      7.15, 9.3, 10' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
      6.01, 10.7, 5' (C. Labordena, Castellon, Spain, 23.5-cm reflector);
      4.74, 10.5, 3'.7 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector; low alt.);
      3.74, 10.8, 4' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector; low alt.);
      3.13, 9.9, 13' (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
      3.13, 9.6, 9' (A. Scholten, Eerbeek, Netherlands, 20-cm reflector);
      2.16, 10.0, 3'.5 (A. Kammerer, St. Leon-Rot, Germany, 0.30-m reflector);
      1.11, 9.8, 6' (A. Scholten, Eerbeek, Netherlands, 20-cm reflector);
Sep. 30.76, 10.8, 5'.3 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + V filter + CCD)
     30.15, 10.3, 11' (T. Lehmann, Weimar, Germany, 6-cm telephoto lens + CCD via DSLR green);
     29.94, 9.8, 7' (A. Scholten, Eerbeek, Netherlands, 20-cm reflector);
     28.12, 10.5, 9' (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     26.88, 11.6, 1'.2 (U. Pilz, Leipzig, Germany, 32-cm reflector);
     13.74, 15.4, 0'.7 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
     13.02, 11.0, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      4.99, 17.4, 0'.2 (Sergey Shurpakov, Baran', Belarus, 0.20-m reflector + CCD);
Aug. 16.00, 18.3, 0'.2 (Sergey Shurpakov, Baran', Belarus, 0.20-m reflector + CCD);
 
 
COMET 4P/Faye
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2014
Nov. 29.79, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     29.78, 14.0, 0'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Oct. 29.75, 15.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     25.78, 14.3, 0'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Sep. 27.80, 14.8, 0'.8 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD0;
     27.79, 14.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     22.79, 14.3, 0'.4 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     16.80, 14.5*, 1'.0 (M. Tsumura, Wakayama, Japan, 18-cm reflector + CCD);
Aug.  6.78, 13.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb.  2.38, 14.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2013
Nov. 30.40, 15.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     17.38, 15.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 6P/d'Arrest
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2015
July 18.76, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 7P/Pons-Winnecke
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2014
Dec. 22.86, 16.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 9P/Tempel
      7.60, 15.0, 0'.5 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
2016
Aug.  7.48, 13.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.89, 9.9, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
July 27.90, 9.8, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      9.54, 12.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      8.94, 10.8, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      2.92, 10.8, 3'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
June 27.93, 10.9, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      7.92, 11.4, 1'.4 (M. Lehky, Upice Observatory, Czech Republic, 0.31-m reflector);
      6.92, 11.4, 1'.5 (M. Lehky, Upice Observatory, Czech Republic, 0.31-m reflector);
      3.49, 13.0, 0'.9 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      1.53, 12.8, 1'.7 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + V filter CCD);
May  31.94, 11.3, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     22.55, 13.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.50, 13.8, 1'.1 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      2.48, 13.9, 0'.8 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      1.46, 14.6, 0'.4 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     11.52, 13.6, 1'.3 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
Apr. 30.58, 13.5, 1'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
     29.97, 12.1, 1'.1 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     23.91, 14.5, 0'.46 (Sergey E. Shurpakov, Baran', Belarus, 15-cm reflector + CCD);
     15.97, 14.7, 0'.42 (Sergey E. Shurpakov, Baran', Belarus, 15-cm reflector + CCD);
     15.71, 14.0, 0'.5 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector; near limit);
     15.65, 13.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      8.71, 14.4, 0'.3 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     22.70, 14.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 10P/Tempel
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
Feb. 11.40, 13.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 24.40, 12.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2015
Dec. 26.40, 12.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov. 30.79, 9.2, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; alt. 9 deg);
      7.96, 11.1, 1'.5 (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      7.78, 9.5, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; alt. 11 deg);
      6.96, 11.2:, 1'.5 (M. Goiato, Aracatuba, Brazil, 0.22-m reflector; clouds);
      3.39, 12.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 24.40, 13.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     18.41, 12.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     14.81, 9.5, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; alt. 11 deg);
      6.95, 10.6,2' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
Sep. 12.43, 14.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 11.47, 16.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 11P/Tempel-Swift-LINEAR
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan.  5.08, 16.4, 20" (H. Sato, Tokyo, Japan, remotely w/ 0.43-m astrograph + CCD at Mayhill, NM, USA);
      1.56, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2020
Dec. 21.18, 16.6, 0'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     19.24, 16.5, 0'.7 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     17.72, 13.2, 1'.0 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     16.83, 10.9, 6' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     15.27, 16.6, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     14.47, 13.3, 1'.4 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
      8.82, 10.9, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      5.18, 15.9, 1'.0 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      3.55, 15.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov. 21.55, [14.0, ! 0'.5 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     14.36, 15.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.56, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 18.53, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     11.49, 16.5, 0.'6 (K. Yoshimoto, Kumage, Yamaguchi, Japan, 0.20-m reflector + CCD);
Sep. 24.38, 16.9, 0'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
 
 
COMET 15P/Finlay
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2015
Feb. 21.39, 12.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     13.75, 11.4, 3'.0 (U. Pilz, Leipzig, Germany, 32-cm reflector);
     11.39, 11.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 31.39, 9.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     24.96, 9.2:, -- (A. Amorim, Florianopolis, Brazil, 0.18-m reflector; light pollution; moonlight);
     24.38, 9.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     21.73, 9.6, 1'.3 (U. Pilz, Leipzig, Germany, 32 cm reflector);
     19.44, 8.8:, 5' (K. Yoshimoto, Yamaguchi, Japan, 26x100 binoculars);
     18.37, 7.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     17.98, 7.0, 3' (W. Souza, Sao Paulo, Brazil, 7x50 binoculars);
     17.41, 7.5, 5' (K. Yoshimoto, Yamaguchi, Japan, 26x100 binoculars);
     16.99, 7.0, 4' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars; outburst);
     11.38, 10.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.70, 9.8, 3'.0 (U. Pilz, Leipzig, Germany, 32-cm reflector);
      2.37, 10.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2014
Dec. 26.97, 9.2, 3'.5 (M. Goiato, Aracatuba, Brazil, 22-cm reflector; moonlight);
     24.97, 9.2, 3' (M. Goiato, Aracatuba, Brazil, 22-cm reflector; clouds; near Mars; moonlight);
     23.42, 10.1, 2' (K. Yoshimoto, Yamaguchi, Japan, 37x100 binoculars);
     23.36, 10.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     19.97, 8.8, 3' (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
     19.46, 8.7, 4' (David A. J. Seargent, Cowra, NSW, Australia, 25x100 binoculars);
     18.96, 8.5, 2' (A. Amorim, Florianopolis, Brazil, 0.18-m reflector);
     18.46, 8.9, 2' (M. Mattiazzo, Swan Hill, Vic., Australia, 25x100 binoculars);
     18.42, 9.0, 3' (P. Camilleri, Warners Bay, Australia, 0.40-m reflector);
     18.40, 9.9, 1'.4 (Y. Fukunaga, Yamaguchi, Japan, 0.18-m reflector + Nikon D700 Digital camera);
     14.96, 10.4, -- (A. Amorim, Florianopolis, Brazil, 0.18-m reflector);
     13.36, 12.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     12.47, 11.7, 2' (M. Mattiazzo, Swan Hill, Vic., Australia, 20-cm reflector);
      6.36, 12.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 16P/Brooks
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Dec. 12.43, 19.0, 8" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
2015
Jan. 24.61, 18.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2014
Dec. 14.68, 18.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 18.76, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 27.75, 17.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     23.78, 16.9 -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 28.76, 15.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 17P/Holmes
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan.  4.37, 15.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2020
Dec. 11.43, 15.9, 18" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
Nov.  5.39, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2015
Mar. 18.82, 16.8, 0'.6 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
Feb. 25.80, 16.3, 0'.8 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     18.14, 16.0, 0'.9 (T. Lehmann, Weimar, Germany, 11-cm refractor + CCD + G filter, remotely from Mayhill, NM, USA);
     11.84, 14.9, 1'.1 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     11.18, 15.8:, 0'.9 (T. Lehmann, Weimar, Germany, 0.43-m reflector + CCD + G filter, remotely from Mayhill, NM, USA);
      8.11, 14.7, 1'.8 (T. Lehmann, Weimar, Germany, 11-cm refractor + CCD + G filter, remotely from Mayhill, NM, USA);
      6.24, 14.5, 1'.7 (T. Lehmann, Weimar, Germany, 11-cm refractor + CCD + G filter, remotely from Mayhill, NM, USA);
      5.08, 14.2, 1'.6 (T. Lehmann, Weimar, Germany, 11-cm refractor + CCD + G filter, remotely from Mayhill, NM, USA);
      3.28, 14.6, 1'.8 (T. Lehmann, Weimar, Germany, 11-cm refractor + CCD + G filter, remotely from Mayhill, NM, USA);
Jan. 31.44, 14.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     29.73, 13.2, 0'.2 (U. Pilz, Leipzig, Germany, 32-cm reflector);
     28.9, 14.6 +30" (N. D. James, Chelmsford, UK, 0.28-m reflector + CCD);
     28.25, 14.3, +20" (R. Miles, Haleakala, HI, U.S.A., 2.0-m reflector + r'-band filter + CCD; outburst);
     22.36, 18.1, +20" (R. Miles, Haleakala, HI, U.S.A., 2.0-m reflector + r'-band filter + CCD);
      2.65, 16.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2014
Oct. 19.59, 16.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 30.36, 15.6, 0'.8 (T. Lehmann, Weimar, Germany, 11-cm refractor + CCD + G filter, remotely near Mayhill, NM, USA);
     27.75, 16.1, 0'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
     22.66, 14.3, 0'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Aug. 20.11, 15.2, 0'.8 (T. Lehmann, Weimar, Germany, 15-cm refractor + CCD + V filter, remotely from Nerpio, Spain);
     18.72, 14.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     10.13, 14.2, 1'.0 (T. Lehmann, Weimar, Germany, 15-cm refractor + CCD + V filter, remotely from Nerpio, Spain);
      1.04, 13.5, -- (U. Pilz, Leipzig, Germany, 32-cm reflector; stellar);
July 26.73, 14.8, 0'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
     23.98, 15.1, 0'.5 (Sergey Shurpakov, Baran', Belarus, 0.20-m reflector + CCD);
     12.73, 14.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June  2.43, 12.5, 2'.0 (A. Hale, Cloudcroft, NM, 0.41-mreflector; low alt.; zodiacal light; early twilight);
2013
Dec. 14.36, 13.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov. 30.37, 14.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     17.36, 14.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 19P/Borrelly
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
Feb. 16.74, 16.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2015
Dec. 19.77, 14.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 15.22, 10.2, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     13.84, 14.0, 0'.9 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
      3.81, 13.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 19.14, 13.3, 0'.6 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     12.80, 13.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 21P/Giacobini-Zinner
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Mar. 24.46, 17.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 27.47, 15.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.58, 14.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Nov. 30.65, 11.3, 1'.3 (S. Yoshida, Gunma, Japan, 0.40-m reflector; diffuse, hard to see);
      3.74, 11.7, 1'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Oct. 20.17, 10.1, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     16.17, 10.0, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     15.75, 9.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     13.23, 9.0, 4' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
      7.72, 8.9, 5'.5 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      6.76, 9.0, 5' (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      6.24, 8.8, 5' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
      4.11, 8.5, 3' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars; moonlight);
      1.71, 8.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.10, 7.8, 8' (M. Lehky, Hradec Kralove, Czech Republic, 10x50 binoculars);
Sep. 30.08, 7.8, 8' (M. Lehky, Hradec Kralove, Czech Republic, 10x50 binoculars);
     24.30, 7.9, 3' (W. Souza, Sao Paulo, Brazil, 0.10-m refractor);
     23.20, 7.8, 5' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
     22.79, 7.6, 7' (Y. Nagai, Gunma, Japan, 11x80 binoculars);
     22.30, 7.8, 3' (W. Souza, Sao Paulo, Brazil, 0.10-m refractor);
     20.09, 7.6, 9'.6 (W. Hasubick, Buchloe, Germany, 9x63 binoculars);
     20.08, 7.3, 10' (M. Lehky, Hradec Kralove, Czech Republic, 10x50 binoculars);
     19.26, 7.3, 5' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
     19.18, 7.6, 6' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars);
     19.15, 7.8:, 5' (V. Gonano, Udine, Italy, 15x10 binoculars);
     19.08, 7.3, 10' (M. Lehky, Hradec Kralove, Czech Republic, 10x50 binoculars);
     18.08, 7.3, 10' (M. Lehky, Hradec Kralove, Czech Republic, 10x50 binoculars);
     17.71, 6.8, 13' (S. Yoshida, Gunma, Japan, 10x70 refractor);
     16.76, 7.1, 10' (Y. Nagai, Gunma, Japan, 12x50 binoculars);
     16.72, 7.8, 6'.5 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera + green channel);
     16.67, 6.9, 11' (S. Yoshida, Gunma, Japan, 10x70 refractor);
     12.17, 7.1, 10' (A. Kammerer, Karlsruhe, Germany, 9x63 binoculars;);
     11.34, 7.3, 6' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     10.16, 7.2, 7' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars);
      9.48, 7.3, 7' (C. S. Morris, Fillmore, CA, 20x80 binoculars; 2-deg tail in p.a. 280 deg);
      9.33, 7.2, 6' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
      9.07, 7.4, 7'.0 (W. Hasubick, Buchloe, Germany, 10x50 binoculars);
      8.27, 7.3, 5' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
      5.76, 7.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      5.35, 7.3, 6' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars; moonlight);
      3.33, 7.1, 7' (C. S. Morris, Fillmore, CA, 20x80 binoculars; at moonrise);
      2.37, 7.1, 7' (C. S. Morris, Fillmore, CA, 20x80 binoculars);
      1.93, 7.4, 5' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars);
Aug. 25.68, 7.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     22.86, 7.4, 8' (M. Lehky, Hradec Kralove, Czech Republic, 10x50 binoculars);
     21.86, 7.4, 8' (M. Lehky, Hradec Kralove, Czech Republic, 10x50 binoculars);
     21.72, 7.6, 5' (K. Yoshimoto, Yamaguchi, Japan, 26x100 binoculars);
     21.71, 8.1, 6'.0 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera + green channel);
     21.07, 8.2, 7'.6 (W. Hasubick, Buchloe, Germany, 9x63 binoculars);
     20.86, 7.5, 8' (M. Lehky, Hradec Kralove, Czech Republic, 10x50 binoculars);
     20.03, 7.5, 6' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars);
     19.86, 7.5, 8' (M. Lehky, Hradec Kralove, Czech Republic, 10x50 binoculars);
     18.86, 7.7, 9' (M. Lehky, Hradec Kralove, Czech Republic, 10x50 binoculars);
     18.67, 7.9, 5' (K. Yoshimoto, Yamaguchi, Japan, 26x100 binoculars);
     18.33, 7.4, 9.5' (C. S. Morris, Fillmore, CA, 10x50 binoculars);
     17.86, 7.7, 9' (M. Lehky, Hradec Kralove, Czech Republic, 10x50 binoculars);
     16.86, 7.8, 9' (M. Lehky, Hradec Kralove, Czech Republic, 10x50 binoculars);
     16.34, 7.7, 8' (C. S. Morris, Fillmore, CA, 20x80 binoculars);
     14.93, 7.8, 8' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars);
     14.70, 8.4, 5'.2 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera + green channel);
     13.44, 7.9, 7' (M.-T. Hui, Mt. Pinos, CA, USA, 20x80 binoculars);
     12.91, 8.4, 5'.4 (W. Hasubick, Buchloe, Germany, 9x63 binoculars);
     12.91, 7.8, 8' (A. Kammerer, Karlsruhe, Germany, 9x63 binoculars);
     12.86, 7.7, 9' (M. Lehky, Hradec Kralove, Czech Republic, 10x50 binoculars);
     12.34, 7.7, 11' (C. S. Morris, Lockwood Valley, CA, 10x50 binoculars);
     11.95, 8.6, 5'.0 (W. Hasubick, Buchloe, Germany, 9x63 binoculars);
     11.95, 7.9, 7' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars);
     11.86, 7.8, 9' (M. Lehky, Hradec Kralove, Czech Republic, 10x50 binoculars);
      9.93, 8.6, 6' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
      9.86, 7.8, 8' (M. Lehky, Hradec Kralove, Czech Republic, 10x50 binoculars);
      8.32, 7.9, 11' (C. S. Morris, Fillmore, CA, 20x80 binoculars);
      7.94, 8.0, 12' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars);
      7.86, 8.0, 8' (M. Lehky, Hradec Kralove, Czech Republic, 10x50 binoculars);
      7.31, 7.9, 11' (C. S. Morris, Fillmore, CA, 20x80 binoculars);
      6.86, 8.0, 8' (M. Lehky, Hradec Kralove, Czech Republic, 10x50 binoculars);
      6.27, 7.9, 10' (C. S. Morris, Fillmore, CA, 20x80 binoculars);
      5.86, 8.1, 8' (M. Lehky, Hradec Kralove, Czech Republic, 10x50 binoculars);
      5.63, 8.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.30, 7.9, & 15' (C. S. Morris, Fillmore, CA, 10x50 binoculars);
      1.92, 9.3, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
July 31.92, 9.7, 2'.3 (W. Hasubick, Buchloe, Germany, 10-cm refractor);
     31.76, 9.4, 3'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
     23.48, 9.4, 5' (M.-T. Hui, Mt. Pinos, CA, USA; 20x80 binoculars; twilight);
     22.10, 9.5, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     18.04, 9.9, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     15.64, 10.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     14.58, 11.3, 1'.5 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
     13.95, 11.2, 0'.7 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     13.57, 10.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     13.50, 10.0, 4' (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      9.97, 10.3, 3'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      4.94, 10.7, 2'.2 (M. Lehky, Hradec Kralove, Czech Republic, 0.20-m reflector);
      3.97, 10.2, 3'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      3.94, 10.7, 2'.5 (M. Lehky, Hradec Kralove, Czech Republic, 0.20-m reflector);
      2.94, 10.9, 2'.5 (M. Lehky, Hradec Kralove, Czech Republic, 0.20-m reflector);
      2.59, 11.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June 20.88, 11.8, 0'.8 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     13.76, 13.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     13.02, 12.2, 1'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     11.33, 14.0, 1'.3 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector + CCD; remotely at Mayhill, NM);
      7.72, 13.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  15.68, 15.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     12.68, 15.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 24.80, 18.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2012
Feb. 11.42, 9.5, 3'.2 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector);
Jan. 26.72, 8.1, 5' (U. Pilz, Leipzig, Germany, 32-cm reflector);
     10.78, 8.8, 9' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
2011
Dec. 27.69, 11.5, 2'.8 (J. Qvam, Borrevannet, Horten, Norway, 0.10-m refractor + CCD + V filter; moonlight);
     22.78, 9.3, 9' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector; alt. 11 deg);
Nov. 25.72, 13.4, 0'.8 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     25.37, 12.2, 1'.3 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     24.38, [12.1, ! 1'.3 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     17.78, 12.2, 1'.5 (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
 
 
COMET 22P/Kopff
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
Jan.  1.36, 13.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2015
Dec. 26.36, 13.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     19.38, 13.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov. 30.77, 9.7, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; alt. 8 deg);
     28.37, 12.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.95, 10.0, 3' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector; near star of mag 11.2);
      7.77, 9.2, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; alt. 10 deg);
      3.38, 12.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 24.38, 12.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     14.80, 9.0, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; alt. 10 deg);
     14.94, 9.5, 4' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     12.40, 12.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      6.94, 9.6,4' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      1.81, 9.5, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Sep. 12.41, 12.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug.  7.94, 11.7, 2' (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
July 10.47, 14.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  19.56, 14.9, 1'.0 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
     15.89, 12.7, 1'.2 (U. Pilz, Leipzig, Germany, 32-cm reflector);
     10.93, 11.0, 2'.0 (U. Pilz, Leipzig, Germany, 32-cm reflector);
Mar. 20.60, 15.6, 0'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
Feb. 14.80, 16.7, 0'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
Jan. 24.75, 16.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 24P/Schaumasse
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Apr. 22.69, 17.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 26.76, 16.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     11.81, 16.8, 0'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
      2.80, 15.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb. 13.77, 14.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     12.76, 13.5, 2'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
Jan. 26.78, 12.8, 3'.2 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     18.25, 11.2, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     13.78, 12.7, 2'.5 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     12.77, 12.5, 2'.5 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      6.86, 12.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Dec. 29.78, 11.6, 3'.5 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     22.77, 12.2, 2'.5 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     21.86, 12.3, 3'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
     20.20, 10.0, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     18.81, 12.0, 2'.1 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     16.82, 12.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.85, 12.4, 3'.0 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
Nov. 26.49, 11.2, 2' (C. Hergenrother, Tucson, AZ, U.S.A., 0.35-m reflector);
     26.24, 10.1, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     25.80, 12.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     24.83, 11.4, 3'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     24.79, 11.5, 1'.4 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     20.79, 11.3, 3'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     16.21, 9.7, 6' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
     14.24, 10.1, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     11.81, 12.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.50, [10.5, -- (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
Oct. 30.79, 12.0, 3'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     29.83, 12.4, 2'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + V filter + CCD);
     28.47, [10.5, -- (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     26.82, 12.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     26.80, 12.8, 1'.2 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     23.20, 10.6, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     17.82, 12.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.83, 13.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.15, 10.9, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Sep. 30.82, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     26.77, 14.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     25.76, [12.2, ! 0'.7 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      2.77, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 26P/Grigg-Skjellerup
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2013
July  8.42, 13.3, 0'.9 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      6.41, 13.5, 0'.9 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      3.37, 13.9, 0'.4 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
 
 
COMET 27P/Crommelin
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2011
July  8.43, 12.1*, 1'.7 (A. Hale, Cloudcroft, NM, U.S.A., 0.41-m reflector);
      5.43, 12.3*, 1'.7 (A. Hale, Cloudcroft, NM, U.S.A., 0.41-m reflector);
      5.10, 10.1, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; alt. 8 deg);
      1.42, 12.9*, 1'.3 (A. Hale, Cloudcroft, NM, U.S.A., 0.41-m reflector);
      1.11, 10.3, 3'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; alt. 11 deg);
 
 
COMET 28P/Neujmin
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Apr. 25.65, 17.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb. 29.73, 18.5, -- (H. Sato, Tokyo, Japan, remotely with 0.51-m astrograph + CCD at Siding Spring; stellar appearance);
 
 
COMET 29P/SCHWASSMANN-WACHMANN
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 13.82, 10.8, 6' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
      7.82, 11.0, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
2020
Dec. 21.20, 13.6, 4'.0 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     20.14, 13.5, 3'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     19.26, 13.5, 4'.2 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     18.11, 13.4, 3'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     15.23, 13.2, 3'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     14.48, 13.6, 1'.0 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     12.26, 14.1, 2'.0 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     11.11, 13.3, 3'.1 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      8.98, 10.8, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      6.09, 13.2, 2'.7 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      5.14, 12.2, 4'.0 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Nov. 21.52, 12.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     21.50, 12.8, 0'.9 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     18.20, 10.8, 6' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     14.47, [15.4, -- (C. Wyatt, Walcha, NSW, Australia, 40-cm reflector);
     10.45, [14.7, -- (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
Sep. 25.28, 14.7, 1'.3 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     24.29, 14.3, 1'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     20.39, 14.1, 2'.0 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     19.37, 14.0, 2'.0 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     12.77, 12.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.32, 14.9, 1'.2 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Aug. 28.32, 13.2, 2'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     27.36, 13.3, 3'.2 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     15.43, 13.5, 2'.2 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     12.45, 13.5, 2'.1 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      9.45, 13.3, 1'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      2.46, 13.5, 1'.1 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      1.47, 13.4, 1'.0 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
July 28.02, 12.8, 0'.1 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     27.81, 12.5, 0.4'(P. Camilleri, Katherine, NT, Australia, 20x80 binoculars);
     19.77, [14.6, -- (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     16.45, 14.4, 1'.4 (H. Sato, Tokyo, Japan, remotely 0.43-m f/6.8 astrograph + CCD at Mayhill, NM);
      2.77, [14.0, -- (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
June 21.78, [14.4, (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
Feb. 19.82, 11.3, 1'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      3.10, 13.4, 15" (H. Sato, Tokyo, Japan, remotely with a 0.43-m astrograph + CCD near Mayhill, NM, USA);
Jan.  2.43, 14.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Nov.  1.55, 14.2, 0'.9 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Oct. 31.56, 13.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     25.87, 11.0:, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Sep. 25.53, 12.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      9.72, [14.0, ! 1'.0 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      6.59, 13.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 27.96, 11.0, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     22.95, 11.5, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      5.00, 12.3, 1'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      3.64, 13.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.03, 12.2, 1'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
July 29.69, 14.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June 26.72, 14.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  31.11, 11.2, 2' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     23.76, 13.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb.  2.39, 13.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 25.80, 10.0, 7' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      6.80, 10.1, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.81, 10.1, 7' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.47, 12.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Dec.  6.78, 10.3, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.39, 12.8, 1'.2 (S. Yoshida, Gunma, Japan, 0.40-m reflector; thin clouds);
      1.38, 12.3, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
Nov. 30.39, 12.5, 1'.3 (S. Yoshida, Gunma, Japan, 0.40-m reflector; new outburst, condensed, easy to see);
     30.37, 12.3, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
     28.81, 12.3, 2' (M. Lehky, Hradec Kralove, Czech Republic, 0.20-m reflector);
      6.79, 12.4, 2' (M. Lehky, Upice observatory, Czech Republic, 0.20-m reflector);
      3.84, 10.4, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Oct. 20.10, 10.0, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     16.02, 10.2, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     10.76, 12.0, 2'.0 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      7.44, 12.2, 1'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      6.86, 13.1, 0'.59 (S. E. Shurpakov, Baran, Belarus, 25-cm reflector + CCD);
      6.53, 12.2, 1'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      6.45, 11.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.87, 10.3, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Sep. 23.18, 12.4, 0'.3 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; outburst);
Aug. 15.00, 13.2, 0'.9 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     13.65, 13.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     12.92, 14.2, 0'.3 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      8.12, 13.5, 0'.7 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
July 22.11, 12.0, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     21.74, 13.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     18.06, 12.3, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     13.71, [13.5, ! 0'.8 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
June  2.76, 14.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  4.37, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Dec. 17.41, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov.  5.43, 15.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 26.38, 12.9, 0'.9 (S. Yoshida, Gunma, Japan, 0.40-m reflector; moonlight;
     22.88, 11.5, 2' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     16.77, 12.2, 1'.1 (M. L. Paradowski, Jablonna, Poland, 20.3-cm reflector);
     13.81, 11.7, 2'.0 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Sep. 25.78, 12.6, 0'.7 (W. Hasubick, Buchloe, Germany, 44 cm reflector);
     25.49, [13.4, ! 0'.8 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     15.87, 11.5, 2'.0 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     10.58, 12.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.94, 11.2, 2' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      1.04, 11.7, 0'.6 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; outburst);
Aug. 25.00, 12.5, 0'.7 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; outburst);
July  8.73, 13.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.06, 12.2, 1'.8 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; outburst);
June 15.70, 14.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  20.73, 13.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.76, 12.5, 1'.2 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Apr. 28.15, 13.1, 0'.4 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; alt. 11 deg);
2016
Nov. 16.77, 12.5, 0'.9 (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
      4.40, 12.3, 0'.9 (S. Yoshida, Kita-karuizawa, Gunma, Japan, 0.40-m reflector);
      3.39, 12.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 26.80, 12.7, 0'.2 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; outburst);
Sep.  4.60, [14.0, -- (A. Pearce, Nedlands, W. Australia, 0.41-m reflector);
      1.49, [14.4, ! 0'.8 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Aug. 11.01, 12.0, 1'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      7.52, 12.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.91, 12.3, 0'.8 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; outburst);
      1.54, 13.0, 0'.8 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
July 30.53, 13.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     29.00, 12.9, 0'.4 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; outburst);
      3.60, 14.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.63, [13.5, -- (A. Pearce, Nedlands, W. Australia, 0.41-m reflector);
June 30.81, [13.5, -- (A. Pearce, Nedlands, W. Australia, 0.41-m reflector);
     13.81, 14.2, 0'.4 (A. Pearce, Nedlands, W. Australia, 0.41-m reflector);
     10.82, [13.0, -- (A. Pearce, Nedlands, W. Australia, 0.41-m reflector);
      7.81, 13.5, 0'.3 (A. Pearce, Nedlands, W. Australia, 0.41-m reflector);
      5.81, [13.0, -- (A. Pearce, Nedlands, W. Australia, 0.41-m reflector);
      2.83, [13.0, -- (A. Pearce, Nedlands, W. Australia, 0.41-m reflector);
May  31.85, [13.0, -- (A. Pearce, Nedlands, W. Australia, 0.41-m reflector);
     22.70, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 30.81, 14.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2015
Aug.  8.91, 12.3, 1'.1 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
July 26.58, 11.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     13.95, 13.5, 0'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; new outburst);
     11.53, 13.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  16.21, 11.3, 1'.5 (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
     16.09, 11.6, 1'.0 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     12.14, 11.2, 1'.25 (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
     11.35, 11.8, 1' (A. Amorim, Florianopolis, Brazil, 0.18-m reflector; moonlight);
     10.67, 11.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2014
May  31.69, 13.9, 1'.0 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
     27.10, 12.4, 1'.5 (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     17.63, 12.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.70, 13.0, -- (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      2.71, 13.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr. 14.72, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 10.21, 12.2, 1'.5 (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
Feb. 12.79, 16.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2013
July  6.42, 12.4, 1'.6 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      3.43, 12.5, 2'.4 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      2.43, 12.6, 1'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
June 30.94, 10.4, 3'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     18.45, 12.5, 0'.7 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     14.99, 11.5, 2'.2 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      3.95, 12.8, 0'.6 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Jan. 20.22, 10.5, 7' (J. J. Gonzalez, Zamora, Spain, 0.20-m reflector);
      8.24, 11.0, 7' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
2012
Dec. 23.26, 12.2, 1'.5 (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
June 13.97, 10.8, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
May  24.88, 13.8, 1'.6 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     23.90, 13.8, 1'.7 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     19.88, 13.7, 1'.7 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     19.88, 12.1, 1'.3 (M. L. Paradowski, Dabrowa, Poland, 0.20-m reflector);
     18.89, 13.5, 1'.8 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     17.90, 13.5, -- (U. Pilz, Leipzig, Germany, 32-cm reflector);
     17.88, 13.7, 1'.7 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     14.95, 11.0, 3'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Apr. 27.96, 13.5, 1'.6 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
      8.90, 12.0, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Mar. 26.99, 13.6, 1'.5 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     25.99, 13.6, 1'.5 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     24.99, 13.6, 1'.8 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     21.99, 13.4, 1'.8 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     21.03, 13.4, 1'.7 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     19.98, 13.4, 1'.7 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     16.01, 13.5, 1'.8 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     15.03, 13.8, 0'.8 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     14.42, [14.9, -- (John Drummond, Gisborne, New Zealand, 41-cm reflector);
Jan.  3.24, 14.2, 0'.3 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
2011
Dec.  7.22, 10.3, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; zodiacal light);
Nov. 25.85, 13.6, 0'.7 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     24.22, 10.0, 7' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      8.24, 10.2, 8' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector; fading from outburst);
June 23.37, 12.5, 3'.8 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     20.37, 12.4, 3'.3 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     19.38, 12.1, 3'.3 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      6.43, 12.2, 2'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      6.00, 11.0, 3' (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
      4.94, 11.7, 1'.5 (A. Amorim, Florianopolis, Brazil, 0.20-m reflector, ASAS-3 magnitudes);
      3.42, 11.9, 2'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      1.94, 10.2, 3'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
May  31.89, 12.8, 1'.3 (J. Cerny, Korcula, Croatia, 0.35-m reflector);
     30.88, 12.8, 1'.4 (J. Cerny, Korcula, Croatia, 0.35-m reflector);
     29.86, 12.7, 1'.5 (J. Cerny, Korcula, Croatia, 0.35-m reflector);
     25.88, 12.8, 1'.3 (J. Cerny, Senohraby, Czech Republic, 0.35-m reflector);
     23.89, 13.2, 1'.4 (J. Cerny, Senohraby, Czech Republic, 0.35-m reflector);
     22.96, 11.8, 1'.5 (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     14.97, 12.7, 0'.3 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; new outburst; moonlight interference);
      9.01, 13.2, 1'.5 (J. J. Gonzalez, Zamora, Spain, 0.20-m reflector);
      7.93, 13.9, 1'.4 (J. Cerny, Senohraby, Czech Republic, 0.35-m reflector);
      7.84, 13.4, 1'.0 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      7.83, 13.6, 1'.2 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
      6.83, 13.7, 1'.0 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
      5.86, 13.7, 1'.0 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
      1.92, 14.0, 2'.1 (J. Cerny, Senohraby, Czech Republic, 0.35-m reflector);
Apr. 30.88, 14.1, -- (U. Pilz, Leipzig, Germany, 32-cm reflector; stellar appearance);
     27.02, 11.3, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     23.88, 13.7, 2'.0 (J. Cerny, Senohraby, Czech Republic, 0.35-m reflector);
     22.92, 14.1, 1'.5 (J. Cerny, Senohraby, Czech Republic, 0.35-m reflector);
      7.91, 13.5, 1'.9 (J. Qvam, Borrevannet, Horten, Norway, 0.10-m refractor + CCD + V filter; moonlight);
      5.02, 11.2, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      2.84, 12.7, 2' (U. Pilz, Leipzig, Germany, 32-cm reflector);
      1.15, 11.2, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Mar. 29.89, 13.8, 1'.5 (J. Cerny, Senohraby, Czech Republic, 0.20-m reflector);
     28.92, 12.2, 0'.4 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     28.88, 13.4, 1'.2 (J. Cerny, Senohraby, Czech Republic, 0.20-m reflector);
     28.74, 12.2, 2'.7 (M.-T. Hui, Mt. Guizi, Wuchang, China, 21.0-cm reflector; city lights);
     24.93, 13.4, 1'.4 (J. Qvam, Borrevannet, Horten, Norway, 0.10-m refractor + CCD + V filter);
     24.80, 12.8, 1' (U. Pilz, Leipzig, Germany, 32-cm reflector);
     23.83, 13.2, 0'.8 (J. Cerny, Senohraby, Czech Republic, 0.20-m reflector);
     21.83, 13.5, 1' (U. Pilz, Leipzig, Germany, 32-cm reflector);
Jan. 29.00, 14.4, 0'.9 (J. Cerny, Jizerka, Czech Republic, 0.30-m reflector);
2010
Dec.  4.82, 14.3, 0'.5 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Nov. 14.17, 14.1, 2'.0 (J. Cerny, Senohraby, Czech Republic, 0.20-m reflector);
      6.80, [13.7, ! 0'.7 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      5.81, [13.1, ! 1'.3 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
June  8.42, 12.9, 3' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      6.41, 12.5, 1'.3 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      5.35, 13.5, 0'.7 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      3.93, 11.8, 1'.8 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
May  16.98, 11.2, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     11.42, 12.4, 1'.2 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     10.40, 12.4, 2'.4 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      9.78, 12.2, 1'.1 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter);
      9.49, 12.3, 1'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      7.49, 12.4, 1'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      6.41, 11.3, 1'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      5.40, 11.3, 2'.2 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      3.46, 11.3, 2'.3 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      3.39, 11.8, 1'.2 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      2.48, 11.5, 2'.2 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      1.94, 12.0, 2' (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
      1.47, 11.4, 2'.2 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Apr. 25.59, 13.1*, -- (M. Tsumura, Wakayama, Japan, 35-cm reflector + CCD);
     20.40, 11.9, 1' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     19.93, [11.6, -- (A. Novichonok, Konchezero, Russia, 13-cm reflector);
     17.88, 13.3, 0'.3 (J. Qvam, Borrevannet, Horten, Norway, 0.46-m reflector + CCD + V filter; moonlight);
     18.98, 12.3, 0'.7 (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
     17.83, 11.6, 4' (U. Pilz, Leipzig, Germany, 32-cm reflector);
     17.00, 11.7, 2'.0 (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector; new outburst);
     16.96, 12.5, 0'.5 (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
     11.27, [12.0, (M. Linnolt, Dillingham, Hawaii, 0.20-m reflector);
      8.02, 12.4, 1'.5 (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
      4.89, 11.8, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Mar. 21.56, 11.7*, 5' (M. Tsumura, Wakayama, Japan, 35-cm reflector + CCD);
     19.86, 11.8, 1'.7 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter);
     19.58, 11.1*, 5'.8 (K. Yoshimoto, Hirao, Yamaguchi, Japan, 16-cm reflector + CCD);
     19.50, 11.9, 5'.4 (C. Wyatt, Walcha, NSW, Australia, 20cm Reflector);
     18.44, 11.1, 6'.4 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     17.79, 13.1, 0'.7 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter);
     17.41, 11.4, 5'.1 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     15.45, 11.8, 4' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     15.12, 11.7, 1'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     14.27, [12.0, -- (M. Linnolt, Dillingham, HI, U.S.A., 0.20-m reflector);
     13.98, 11.5, 2' (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
     11.12, 11.2, 2' (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
      9.83, 11.5, 2' (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
      9.50, 11.4, 5'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      8.89, 11.2, 2'.5 (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
      8.47, 11.4, 6'.4 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      7.27, [12.5, -- (M. Linnolt, Dillingham, HI, U.S.A., 0.20-m reflector);
      7.00, 11.0, 2'.5 (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
      5.88, 10.6, 2' (U. Pilz, Leipzig, Germany, 32-cm reflector);
      1.81, 10.8, 1'.5 (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
Feb. 21.17, 10.7, 2'.5 (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
     19.61, 10.6, 1'.5 (M. Mattiazzo, Castlemaine, Victoria, Australia, 20-cm reflector);
     17.80, 11.0, 1'.8 (A. Novichonok, Konchezero, Russia, 13-cm reflector);
     16.85, 10.7, 2'.1 (A. Novichonok, Konchezero, Russia, 13-cm reflector);
     15.08, 10.8, 2' (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
     15.04, 11.7, 2' (U. Pilz, Leipzig, Germany, 32-cm reflector);
     14.28, 10.8, 2'.5 (M. Linnolt, Dillingham, Hawaii, 0.20-m reflector);
     13.73, 10.9, 2'.0 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector);
     10.50, 10.7, 0'.7 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     10.04, 11.1, 1'.2 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      8.10, 10.8, 1'.25 (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
      7.25, 11.0, 1' (M. Goiato, Aracatuba, Brazil, 22-cm reflector; moonlight);
      6.54, 10.8, 0'.5 (M. Mattiazzo, Castlemaine, Victoria, Australia, 20-cm reflector);
      6.35, 11.5, 1'.14 (S. E. Shurpakov, Baran, Belarus, 36-cm reflector + CCD);
      6.12, 11.3, 1' (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
      5.66, 11.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      5.57, 11.0, 0'.4 (D. Chestnov, remotely from Moorook, S. Australia, 0.15-m refractor + CCD);
 
 
COMET 30P/Reinmuth
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Apr. 21.70, 18.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 13.74, 18.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  6.83, 17.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Dec. 21.87, 17.1, 0'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
Nov. 25.84, 17.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
Dec. 24.42, 17.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     18.48, 17.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 31P/Schwassmann-Wachmann
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Feb.  2.63, 18.5, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
 
 
COMET 32P/Comas Sola
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2015
May  19.54, 16.0, 0'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
Mar. 27.30, 14.3, 1'.7 (T. Lehmann, Weimar, Germany, 11-cm refractor + CCD + G filter, remotely from Mayhill, NM, USA);
     23.85, 13.7, 0'.7 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     18.89, 14.2, 1'.5 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     11.37, 13.5, 2'.2 (T. Lehmann, Weimar, Germany, 11-cm refractor + CCD + G filter, remotely from Mayhill, NM, USA);
Feb. 25.92, 14.0, 1'.3 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     14.74, 14.4, 0'.9 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
     11.92, 14.5, 0'.8 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
      3.44, 14.3, 1'.0 (T. Lehmann, Weimar, Germany, 11-cm refractor + CCD + G filter, remotely from Mayhill, NM, USA);
Jan. 25.40, 14.2, 1'.3 (T. Lehmann, Weimar, Germany, 11-cm refractor + CCD + G filter, remotely from Mayhill, NM, USA);
     17.67, 13.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     11.40, 14.4, 0'.9 (T. Lehmann, Weimar, Germany, 11-cm refractor + CCD + G filter, remotely from Mayhill, NM, USA);
      4.47, 14.1, 0'.9 (T. Lehmann, Weimar, Germany, 11-cm refractor + CCD + G filter, remotely from Mayhill, NM, USA);
2014
Dec. 20.46, 14.2, 1'.0 (T. Lehmann, Weimar, Germany, 11-cm refractor + CCD + G filter, remotely from Mayhill, NM, USA);
      5.47, 14.5, 1'.0 (T. Lehmann, Weimar, Germany, 11-cm refractor + CCD + G filter, remotely from Mayhill, NM, USA);
Nov. 29.82, 14.5, 0'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
     29.80, 13.9, 0'.7 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     29.77, 14.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     26.49, 14.3, 1'.0 (T. Lehmann, Weimar, Germany, 11-cm refractor + CCD + G filter near Mayhill, NM, USA);
     18.48, 14.8, 0'.6 (T. Lehmann, Weimar, Germany, 0.25-m reflector + CCD + G filter near Mayhill, NM, USA);
     10.51, 14.5, 0'.8 (T. Lehmann, Weimar, Germany, 11-cm refractor + CCD + G filter near Mayhill, NM, USA);
      2.18, 14.8, 0'.7 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR);
      2.17, 13.3, 1'.6 (U. Pilz, Leipzig, Germany, 32-cm reflector);
Oct. 29.77, 14.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     25.77, 14.1, 0'.7 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     23.46, 14.5, 0'.9 (T. Lehmann, Weimar, Germany, 11-cm refractor + CCD + G filter near Mayhill, NM, USA);
     12.48, 14.6, 0'.7 (T. Lehmann, Weimar, Germany, 11-cm refractor + CCD + G filter near Mayhill, NM, USA);
      1.44, 14.4, 1'.0 (T. Lehmann, Weimar, Germany, 11-cm refractor + CCD + G filter near Mayhill, NM, USA);
Sep. 27.78, 14.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     28.13, 12.4, 1'.5 (U. Pilz, Leipzig, Germany, 32-cm reflector);
     22.78, [14.2, ! 0'.7 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     10.46, 14.8, 0'.8 (T. Lehmann, Weimar, Germany, 11-cm refractor + CCD + G filter near Mayhill, NM, USA);
Aug. 18.77, 14.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.76, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar.  9.77, [16.5, -- (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
Jan. 31.75, 17.4, -- (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     27.74, 17.2:, -- (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     15.74, 17.4, 0'.3 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
      5.73, 17.5, 0'.3 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
2013
Nov. 23.44, 17.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 33P/Daniel
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
Dec.  9.70, 17.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov.  3.72, 18.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 37P/Forbes
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Oct. 28.52, 17.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 19.06, 11.0, 7' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     17.75, [13.1, ! 0'.7 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     16.74, [13.5, ! 0'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      9.97, 11.0, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Aug. 20.10, 10.5, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     15.01, 11.2, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     13.67, 14.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     10.04, 11.2, 3'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
July 22.12, 10.5, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     18.09, 11.0, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     14.67, 13.0, 1'.2 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
     13.68, 13.5, 1'.0 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     10.07, 10.6, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      8.65, 12.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June 19.11, 10.3, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     17.33, 12.7:, 1' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector; very near 12.8-mag star);
     13.11, 10.5, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
May  21.14, 10.7, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     16.12, 11.5, 1'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     11.78, 13.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr. 20.79, 13.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 38P/Stephan-Oterma
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
May  24.54, 16.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.56, 15.6, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
Apr. 23.92, 16.6, 0'.4 (J. Qvam, Nykirke, Norway, 0.5-m reflector + CCD + V filter);
      3.55, 14.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 16.58, 14.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     10.88, 14.8, 0'.7 (J. Qvam, Nykirke, Norway, 0.5-m reflector + CCD + V filter; moonlight);
Feb. 26.83, 11.7, 2' (M. Lehky, Upice observatory, Czech Republic, 0.20-m reflector);
     25.79, 11.7, 2' (M. Lehky, Upice observatory, Czech Republic, 0.20-m reflector);
     24.92, 11.5, 2' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     23.50, 12.6, 1'.8 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     14.69, 11.7, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
     12.81, 11.1, 2' (M. Lehky, Upice observatory, Czech Republic, 0.16-m refractor);
     11.83, 13.6, 0'.9 (J. Qvam, Nykirke, Norway, 0.5-m reflector + CCD + V filter; moonlight);
Jan. 25.82, 10.5, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     19.71, 11.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     14.08, 10.3, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     13.77, 11.4, 2'.6 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD + green channel);
      6.84, 9.9, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      6.82, 10.5, 3' (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
      4.87, 9.9, 5' (J. J. Gonzalez, Asturias, Spain,0.20-m reflector);
      2.81, 10.7, 1'.8 (A. Kammerer, Karlsruhe, Germany, 0.20-m reflector);
      1.85, 9.9, 5' (J. J. Gonzalez, Leon, Spain,0.20-m reflector);
2018
Dec. 31.62, 10.1, 5' (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     30.19, 10.1, 3'.5 (M. Goiato, Arašatuba, Brazil, 0.22-m reflector);
     29.84, 9.7, 6' (J. J. Gonzalez, Leon, Spain,0.20-m reflector);
     14.23, 9.5, 5' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector; near 9th-mag star);
     14.05, 10.2, 4' (J. J. Gonzalez, Leon, Spain,0.20-m reflector);
      9.64, 10.5, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
      9.25, 9.5, 5' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      7.58, 10.4, 6' (Y. Nagai, Gunma, Japan, 20x100 binoculars);
      7.14, 9.4, 5' (J. J. Gonzalez, Leon, Spain,0.20-m reflector);
      1.81, 11.0, 2'.2 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + V filter + CCD);
      1.75, 10.5, 3'.3 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Nov. 30.62, 9.8, 3'.0 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     24.77, 10.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     17.94, 9.4, 4'.5 (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     16.94, 9.6, 4' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     16.13, 9.5, 5' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     13.15, 9.4, 5' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
      9.17, 9.3, 5' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
      6.98, 9.5, 4' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
      4.00, 9.0, 6' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
      3.71, 10.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.65, 10.0, 6' (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Oct. 16.08, 9.1, 7' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     15.74, 11.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     13.31, 10.1, 3' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector; clouds; comet near stars of similar brightness);
     13.00, 12.8, 0'.57 (S. E. Shurpakov, Baran, Belarus, 20-cm reflector + CCD);
     12.12, 12.5, 0'.44 (S. E. Shurpakov, Baran, Belarus, 25-cm reflector + CCD);
      7.71, 11.4, 3'.2 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      6.77, 10.9, 2'.4 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      6.23, 10.5, 3' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      4.99, 13.2, 0'.37 (S. E. Shurpakov, Baran, Belarus, 25-cm reflector + CCD);
      4.02, 9.9, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.70, 11.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 19.17, 10.0, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     17.68, 11.5, 1'.3 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     16.74, 12.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     16.72, 11.6, 3'.8 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera + green channel);
     16.69, 11.4, 2'.3 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     10.17, 9.9, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      9.07, 12.5, 0'.9 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      5.77, 12.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 21.71, 13.8, 1'.2 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera + green channel);
     20.15, 10.5, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     17.78, 13.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     17.73, 13.7, 1'.2 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera + green channel);
     15.17, 10.9, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     10.17, 11.5, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      9.78, 13.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 31.74, 14.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     18.74, 14.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     14.78, 15.4, 0'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
     10.80, 15.9, 0'.41 (K. Yoshimoto, Yamaguchi, Japan, 0.50-m reflector + CCD; remotely at Siding Spring, NSW);
     13.76, 14.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      8.75, 14.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June 21.83, 16.4, 0'.25 (K. Yoshimoto, Yamaguchi, Japan, 0.50-m reflector + CCD; remotely at Siding Spring, NSW);
May  25.81, 16.4, 12" (H. Sato, Tokyo, Japan, 0.51-m astrograph + CCD, remotely at Siding Spring, NSW);
 
 
COMET 40P/Vaisala
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2015
Jan.  2.83, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2014
Dec. 22.84, 15.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov. 29.84, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 41P/Tuttle-Giacobini-Kresak
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2017
July 18.58, 13.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     14.97, 10.6, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      7.55, 14.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.05, 10.7, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
June 20.94, 10.2, 6' (M. Lehky, Upice Observatory, Czech Republic, 10x50 binoculars);
     19.94, 10.4, 4'.5 (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     18.94, 10.4, 4' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     15.63, 10.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     14.95, 9.5, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     12.94, 9.8, 5' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
      4.64, 10.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.99, 9.4, 8' (M. Lehky, Upice Observatory, Czech Republic, 25x100 binoculars);
May  31.96, 9.4, 8' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     30.02, 9.2, 6' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     29.69, 11.0, 2'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     28.95, 9.2, 6' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     28.00, 8.7, 18' (M. L. Paradowski, Dabrowa, Poland, 3.4-cm camera lens + CCD);
     27.98, 9.3, 4'.5 (A. Kammerer, Karlsruhe, Germany, 9x63 binoculars);
     27.95, 9.0, 7' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     26.92, 9.0, 7' (M. Lehky, Upice Observatory, Czech Republic, 25x100 binoculars);
     26.88, 8.5, 4'.0 (W. Hasubick, Buchloe, Germany, 10x50 binoculars);
     26.02, 8.8, 8' (M. Lehky, Upice Observatory, Czech Republic, 25x100 binoculars);
     25.01, 8.8, 8' (M. Lehky, Upice Observatory, Czech Republic, 25x100 binoculars);
     24.09, 7.8, 9' (J. J. Gonzalez, Leon, Spain, 0.08-m refractor);
     23.90, 8.7, 8' (M. Lehky, Upice Observatory, Czech Republic, 25x100 binoculars);
     22.94, 8.7, 8' (M. Lehky, Upice Observatory, Czech Republic, 25x100 binoculars);
     22.69, 10.9, 2'.5 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     19.91, 8.4, 9' (M. Lehky, Upice Observatory, Czech Republic, 25x100 binoculars);
     19.64, 9.7, 6' (Y. Nagai, Gunma, Japan, 20x100 binoculars);
     18.96, 8.4, 9' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     18.72, 10.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      6.57, 9.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.73, 10.6, 5'.5 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      4.71, 9.0, 3'.6 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
      3.07, 7.0, 15' (J. J. Gonzalez, Leon, Spain, 12x45 monocular);
      3.02, 8.4, 9' (M. Lehky, Hradec Kralove, Czech Republic, 10x80 binoculars);
      1.77, 8.4, 11' (Y. Nagai, Gunma, Japan, 20x100 binoculars);
      1.71, 9.0, 4'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
Apr. 30.95, 8.3, 10' (M. Lehky, Hradec Kralove, Czech Republic, 10x80 binoculars);
     29.56, 8.9, 6'.5 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     28.07, 7.1, 15' (J. J. Gonzalez, Leon, Spain, 12x45 monocular);
     25.03, 8.0, 10' (M. Lehky, Hradec Kralove, Czech Republic, 10x80 binoculars);
     23.87, 7.3, 10'82 (W. Hasubick, Buchloe, Germany, 10x50 binoculars);
     23.72, 8.0, 11' (K. Yoshimoto, Yamaguchi, Japan, 26x100 binoculars);
     22.26, 6.8, 18' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     21.92,  7.8, 17' (A. Kammerer, Karlsruhe, Germany, 9x63 binoculars);
     21.86, 7.5, 13'.2 (W. Hasubick, Buchloe, Germany, 10x50 binoculars);
     21.11, 6.9, 15' (J. J. Gonzalez, Leon, Spain, 12x45 monocular);
     15.50, 7.5, 14' (Y. Nagai, Gunma, Japan, 20x100 binoculars);
     13.73, 8.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     12.85, 6.2, 17' (J. J. Gonzalez, Leon, Spain, 12x45 monocular);
      7.60, 7.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.15, 6.0, 25' (J. J. Gonzalez, Leon, Spain, 12x45 monocular; some moonlight);
      2.82, 7.4, 16' (K. Yoshimoto, Yamaguchi, Japan, 8x42 binoculars);
      2.56, 8.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.70, 7.2, 16' (K. Yoshimoto, Yamaguchi, Japan, 8x42 binoculars);
      1.16, 6.5, 20' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars);
Mar. 31.98, 6.8, 20' (M. Lehky, Hradec Kralove, Czech Republic, 10x80 binoculars);
     30.94,  6.5, 30' (A. Kammerer, Karlsruhe, Germany, 9x63 binoculars);
     30.85, 6.9, 20' (M. Lehky, Hradec Kralove, Czech Republic, 10x80 binoculars);
     28.85, 6.9, 25' (M. Lehky, Upice Observatory, Czech Republic, 20x100 binoculars);
     28.10, 6.5, 25' (J. J. Gonzalez, Asturias, Spain, 5x30 monocular);
     27.88,  7.2, 30' (A. Kammerer, Karlsruhe, Germany, 9x63 binoculars);
     27.85, 7.0, 18' (M. Lehky, Hradec Kralove, Czech Republic, 20x100 binoculars);
     26.85, 7.0, 18' (M. Lehky, Hradec Kralove, Czech Republic, 20x100 binoculars);
     26.85, 7.0, 26'.5 (W. Hasubick, Buchloe, Germany, 9x63 binoculars)
     25.81, 7.1, 14' (M. Lehky, Upice Observatory, Czech Republic, 20x100 binoculars);
     24.88, 7.1, 15' (M. Lehky, Upice Observatory, Czech Republic, 20x100 binoculars);
     22.58, 7.3, 16' (S. Yoshida, Mt. Hanadate, Ibaraki, Japan, 10x70 refractor);
     20.02, 7.5, 20' (J. J. Gonzalez, Asturias, Spain, 10x50 binoculars);
     17.69, 8.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     15.89, 7.8, 17' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars);
     15.79, 8.8, 10' (M. Lehky, Upice Observatory, Czech Republic, 20x100 binoculars);
      4.51, 10.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.72, 10.4, 5' (S. Yoshida, Mt. Hanadate, Ibaraki, Japan, 0.40-m reflector);
      2.10, 10.2, 6' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      1.01, 9.1, 7' (J. J. Gonzalez, Asturias, Spain, 25x100 binoculars);
Feb. 27.80, 10.0, 6' (M. Lehky, Upice Observatory, Czech Republic, 20x100 binoculars);
     26.83, 10.8, 1'.8 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     25.89, 9.5, 7'.8 (M. L. Paradowski, Lublin, Poland, 6.8-cm refractor + CCD);
     25.74, 10.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     24.90, 9.4, 6' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
     24.55, 10.1, 9' (K. Yoshimoto, Yamaguchi, Japan, 26x100 binoculars);
     22.12, 11.3, 3' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     21.12, 11.6, 2'.5 (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     19.58, 11.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     19.47, 11.9, 3'.0 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector);
     16.84, 10.9, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     16.81, 12.0, 0'.8 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     16.02, 11.8, 2' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      6.78, 13.4, 0'.8 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
      6.68, 12.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      5.17, 12.7, 0'.6 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
Jan. 28.85, [13.5, -- (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     28.57, 13.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     24.78, 13.8, 0'.7 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     24.23, 11.5, 4' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     16.67, 15.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
Dec. 28.72, 17.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      9.76, 19.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 43P/Wolf-Harrington
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2017
Mar. 19.65, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb.  6.72, 14.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 24.80, 13.6, 0'.6 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
      6.80, 13.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
Dec. 29.80, [13.0, -- (A. Pearce, Nedlands, W. Australia, 0.41-m reflector);
     26.19, 12.0, 2' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
      5.22, 10.5, 3' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
      2.82, 13.3, 1'.0 (S. Yoshida, Kita-karuizawa, Gunma, Japan, 0.40-m reflector);
Nov. 30.22, 10.3, 4' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     22.80, 13.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     17.77, 13.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.82, 12.7, 0'.7 (S. Yoshida, Kita-karuizawa, Gunma, Japan, 0.40-m reflector);
      3.77, 12.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.81, 13.1, 1'.0 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
Oct. 27.21, 10.1, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     20.82, 12.9, 0'.4 (S. Yoshida, Kita-karuizawa, Gunma, Japan, 0.40-m reflector);
     14.82, 12.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      5.79, 12.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.19, 9.5, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.84, 12.4, 0'.9 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
Sep. 29.19, 9.5, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      9.82, 12.4, 0'.8 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
      9.16, 9.5, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      6.16, 9.6, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.80, 11.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 31.12, 12.8, 0'.5 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     30.17, 9.8, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     22.77, 12.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     11.15, 10.9, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; zodiacal light);
      7.79, 12.5, 0'.9 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
July 30.77, 12.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     28.77, 12.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     14.79, 12.9, 0'.8 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
      6.76, 13.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.76, 13.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 45P/Honda-Mrkos-Pajdusakova
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2017
Apr. 13.66, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 22.61, 13.6, 1'.0 (S. Yoshida, Mt. Hanadate, Ibaraki, Japan, 0.40-m reflector; close to 14th-mag star);
     20.05, 11.0, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     17.65, 12.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.75, 10.5, 6'.4 (K. Harikae, Chiba, Japan, 0.15-m reflector + DSLR green channel);
      4.59, 10.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.73, 10.7, 6' (S. Yoshida, Mt. Hanadate, Ibaraki, Japan, 0.40-m reflector);
      2.14, 8.2, 12' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
Feb. 28.86, 8.2, 8' (J. J. Gonzalez, Asturias, Spain, 25x100 binoculars);
     27.78, 8.6, 14' (M. Lehky, Upice Observatory, Czech Republic, 20x100 binoculars);
     26.83, 10.2, 5'.4 (W. Hasubick, Buchloe, Germany, 10-cm refractor);
     25.96, 10.0, 7'.8 (M. L. Paradowski, Lublin, Poland, 6.8-cm refractor + CCD; DSLR green channel);
     25.83, 10.0, 7'.5 (K. Harikae, Chiba, Japan, 0.15-m reflector + DSLR green channel);
     25.77, 9.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     24.91, 7.8, 12' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars);
     24.57, 9.2, 14' (K. Yoshimoto, Yamaguchi, Japan, 26x100 binoculars);
     22.85, 7.7, 12' (J. J. Gonzalez, Asturias, Spain, 10x50 binoculars);
     22.19, 8.6, 10' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     21.22, 7.8, 12' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars);
     19.72, 7.8, 20' (K. Yoshimoto, Yamaguchi, Japan, 26x100 binoculars);
     16.96, 7.5, 15' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars.);
     16.04, 8.1, 10' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     15.91, 7.1, 16'.4 (W. Hasubick, Buchloe, Germany, 10-cm refractor);
     15.72, 8.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     15.04, 7.9, 10' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     11.80, 7.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     10.78, 7.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      8.24, 6.7, 22' (J. J. Gonzalez, Leon, Spain, 6x40 monocular);
      6.85, 7.8, 6'.9 (K. Harikae, Funabashi, Chiba, Japan, 0.15-m reflector + digital camera + green channel);
      6.83, 6.9, 16' (S. Yoshida, Ibaraki, Japan, 10x70 refractor);
      5.19, 7.0, 15'.7 (W. Hasubick, Buchloe, Germany, 9x63 binoculars);
      3.86, 7.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.85, 7.9, 7'.1 (K. Harikae, Funabashi, Chiba, Japan, 0.15-m reflector + digital camera + green channel);
      2.86, 7.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.86, 7.2, 10'.2 (K. Yoshimoto, Yamaguchi, Japan, 180-mm f/2.8 lens + Nikon D5100 digital camera G channel);
      1.86, 8.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 15.37, 7.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      9.36, 7.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.37, 7.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      6.77, 6.5, 3' (J. J. Gonzalez, Asturias, Spain, 10x50 binoculars; alt. 9 deg; moonlight);
      6.39, 6.6, 4' (K. Yoshimoto, Yamaguchi, Japan, 26x100 binoculars);
      4.37, 7.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.77, 6.8, 2'.5 (J. J. Gonzalez, Asturias, Spain, 10x50 binoculars; alt. 9 deg; moonlight);
      1.37, 7.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.36, 7.2, 3' (Y. Nagai, Saitama, Japan, 0.32-m reflector);
      1.71 7.4, 2'.2 (W. Hasubick, Buchloe, Germany, 10-cm refractor);
2016
Dec. 31.77, 6.9, 2'.5 (J. J. Gonzalez, Asturias, Spain, 10x50 binoculars; alt. 10 deg);
     31.71, 7.4, 2'.2 (W. Hasubick, Buchloe, Germany, 10-cm refractor);
     31.40, 6.9, 5' (K. Yoshimoto, Yamaguchi, Japan, 26x100 binoculars);
     30.77, 7.0, 2'.5 (J. J. Gonzalez, Asturias, Spain, 10x50 binoculars; alt. 10 deg);
     30.70, 7.5, 1'.6 (W. Hasubick, Buchloe, Germany, 10-cm refractor);
     30.52, 7.4, 2'.5 (A. Pearce, Nedlands, W. Australia, 0.1-m reflector);
     29.77, 7.1, 2'.5 (J. J. Gonzalez, Asturias, Spain, 10x50 binoculars; alt. 10 deg);
     29.70, 7.6, 1'.6 (W. Hasubick, Buchloe, Germany, 10-cm refractor);
     29.52, 7.5, 2'.2 (A. Pearce, Nedlands, W. Australia, 0.1-m reflector);
     29.38, 7.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     28.98, 7.6, & 3' (K. Wierzchos, Tampa, FL, USA, 0.15-m reflector);
     28.95, 7.3, 3' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
     28.77, 7.2, 3' (J. J. Gonzalez, Asturias, Spain, 10x50 binoculars; alt. 10 deg);
     28.52, 7.6, 2'.5 (A. Pearce, Nedlands, W. Australia, 0.1-m reflector);
     28.37, 7.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     26.77, 7.3, 4' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars; alt. 9 deg);
     26.00, 8.0, & 3' (K. Wierzchos, Tampa, FL, USA, 0.15-m reflector);
     25.52, 7.9, 2'.5 (A. Pearce, Nedlands, W. Australia, 0.1-m reflector);
     25.37, 8.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     24.98, 8.2, & 3' (K. Wierzchos, Tampa, FL, USA, 0.15-m reflector);
     24.37, 8.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     23.40, 8.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     22.99, 8.4, & 3' (K. Wierzchos, Tampa, FL, USA, 0.15-m reflector);
     22.70, 8.5, 1'.8 (W. Hasubick, Buchloe, Germany, 10-cm refractor);
     22.52, 8.2, 2' (A. Pearce, Nedlands, W. Australia, 0.1-m reflector);
     21.52, 8.2, 2'.5 (A. Pearce, Nedlands, W. Australia, 0.1-m reflector);
     20.52, 8.5, 2'.5 (A. Pearce, Nedlands, W. Australia, 0.1-m reflector);
     19.52, 8.5, 3' (A. Pearce, Nedlands, W. Australia, 0.1-m reflector);
     18.37, 8.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     17.77, 8.5, 2' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars; alt. 8 deg);
     17.36, 9.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     16.39, 8.3, 4' (K. Yoshimoto, Yamaguchi, Japan, 26x100 binoculars);
     11.36, 10.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     10.38, 10.9, -- (H. Abe, Matsue-shi, Shimane-ken, Japan, 0.26-m reflector + CCD);
     10.36, 10.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      6.39, 10.9, 1'.2 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector);
      3.38, 12.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.36, 11.0, 1'.7 (S. Yoshida, Kita-karuizawa, Gunma, Japan, 0.40-m reflector; diffuse but easy to see);
      2.37, 12.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2011
Dec.  7.23, 10.5, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; zodiacal light);
Nov. 25.83, 13.5, 0'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      8.22, 9.5, 5' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
Oct. 30.19, 9.2, 3'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     26.84, 9.6, 2'.5 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector);
      9.22, 7.5, 4' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars; zodiacal light);
      9.14, 8.2, 2'.7 (M. L. Paradowski, Dabrowa, Poland, 0.20-m reflector);
      8.81, 8.0, 3'.5 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      7.83, 7.3, 4' (K. Yoshimoto, Yamaguchi, Japan, 20x100 binoculars);
      7.80, 8.0, 1'.9 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      7.33, 7.6, 4' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars; alt. 10 deg);
      4.33, 7.3, 4' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars; alt. 9 deg);
      2.15, 7.3, 6' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
      1.21, 7.2, 4' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars; 0.6-deg tail in p.a. 290 deg);
      1.16, 6.8, -- (A. Kammerer, St. Leon-Rot, Germany, 9x63 binoculars);
      1.14, 7.2, 6' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
Sep. 30.17, 7.8, 2'.1 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     30.13, 7.2, 6' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     30.12, 6.4, 3' (U. Pilz, Leipzig, Germany, 15x70 binoculars);
     27.82, 6.7, 4' (K. Yoshimoto, Yamaguchi, Japan, 20x100 binoculars);
     27.14, 7.4, 3' (B. H. Granslo, Fjellhamar, Norway, 0.10-m refractor; alt. 9 deg; clouds);
     26.16, 7.1, 2' (A. Kammerer, St. Leon-Rot, Germany, 0.20-m reflector);
     26.14, 6.8, 5' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     25.18, 6.6, 5' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars);
     25.13, 6.7, 5' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     24.82, 6.6, 3' (K. Yoshimoto, Yamaguchi, Japan, 20x100 binoculars);
     24.14, 7.2, 3' (B. H. Granslo, Fjellhamar, Norway, 0.10-m refractor; alt. 9 deg; twilight);
     23.82, 6.9, 3' (K. Yoshimoto, Yamaguchi, Japan, 20x100 binoculars);
Aug. 14.36, 8.0, 3' (W. Souza, Sao Paulo, Brazil, 20x80 binoculars; full moon at low alt.);
     13.36, 8.1, 3' (W. Souza, Sao Paulo, Brazil, 20x80 binoculars; full moon at low alt.);
     11.35, 8.9, 12' (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
      8.07, 9.2, 8' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; alt. 6 deg);
      8.05, 10.0, -- (A. Amorim, Florianopolis, Brazil, 0.18-m reflector; moonlight);
      7.12, 10.5:, -- (A. Amorim, Florianopolis, Brazil, 0.18-m reflector; moonlight);
      6.04, 10.7, 2' (A. Amorim, Florianopolis, Brazil, 0.18-m reflector; moonlight);
      5.14, 11.0:, -- (A. Amorim, Florianopolis, Brazil, 0.18-m reflector);
      4.44, 11.0, 2'.6 (S. T. Rae, Hamilton, New Zealand, 0.25-m reflector);
      4.16, 11.5, 1' (A. Amorim, Florianopolis, Brazil, 0.18-m reflector);
      4.08, 9.8, 8' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      3.08, 11.2:, -- (A. Amorim, Florianopolis, Brazil, 0.18-m reflector);
      2.80, 10.6, 3'.4 (M.-T. Hui, Canton, China, 20.0-cm reflector; city lights);
      1.80, 10.4, 2'.8 (M.-T. Hui, Canton, China, 20.0-cm reflector; city lights; smog);
      1.67, 11.5, 1'.5 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector);
      1.10, 10.7, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
July 31.44, 10.6, 3' (S. T. Rae, Hamilton, New Zealand, 0.25-m reflector);
     29.58, 13.1, 1'.1 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     28.83, 12.4:, & 2' (M.-T. Hui, Canton, China, 20.0-cm reflector; city lights);
     28.04, 11.3, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
 
 
COMET 46P/Wirtanen
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
May  11.48, 16.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr.  2.91, 11.2, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Mar. 29.86, 13.0, 0'.3 (W. Hasubick, Buchloe, Germany, 44-cm rreflector);
     23.87, 10.8, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Feb. 26.82, 10.5, 3'.5 (M. Lehky, Upice observatory, Czech Republic, 0.20-m reflector);
     25.78, 10.5, 3'.5 (M. Lehky, Upice observatory, Czech Republic, 0.20-m reflector);
     24.85, 8.8, 8' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
     23.49, 10.2, 4'.3 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     14.70, 9.1, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
     13.17, 7.7, 18' (J. J. Gonzalez, Leon, Spain, 12x45 monocular);
     12.79, 8.4, 8' (M. Lehky, Upice observatory, Czech Republic, 25x100 binoculars);
      8.48, 9.4, 4' (Y. Nagai, Gunma, Japan, 20x100 binoculars);
      7.17, 8.1, 10' (M. Lehky, Upice observatory, Czech Republic, 12x60 binoculars);
      6.01, 6.7, 25' (J. J. Gonzalez, Asturias, Spain, 12x45 monocular);
      3.00, 6.5, 30' (J. J. Gonzalez, Matadeon de los Oteros, Leon, Spain, 12x45 monocular);
      2.78, 9.7, 5'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD + green channel);
Jan. 30.21, 7.0, 15' (M. Lehky, Velichovky, Czech Republic, 10x50 binoculars);
     29.67, 8.3, 8' (Y. Nagai, Gunma, Japan, 20x100 binoculars);
     25.84, 6.2, 35' (J. J. Gonzalez, Leon, Spain, 12x45 monocular);
     19.73, 8.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     18.75, 6.9, 15' (M. Lehky, Hradec Kralove, Czech Republic, 10x50 binoculars);
     14.75, 6.7, 20' (M. Lehky, Velichovky, Czech Republic, 10x50 binoculars);
     14.10, 5.6, 45' (J. J. Gonzalez, Leon, Spain, 12x45 monocular);
     13.77, 6.7, 18'.0 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD + green channel);
      7.16, 5.4, 40' (J. J. Gonzalez, Leon, Spain, 12x45 monocular);
      6.85, 5.5, 35' (J. J. Gonzalez, Leon, Spain, 12x45 monocular);
      6.82, 5.5, 26' (S. Yoshida, Ibaraki, Japan, 10x70 refractor);
      3.47, 6.0, 17' (Y. Nagai, Gunma, Japan, 12x50 binoculars);
      2.79, 5.5, 20' (A. Kammerer, Karlsruhe, Germany, 9x63 binoculars;);
      1.80, 5.0, 40' (J. J. Gonzalez, Leon, Spain, naked eye);
      1.76, 5.5, 30' (M. Lehky, Hradec Kralove, Czech Republic, naked eye);
      1.47, 5.5, 20' (Y. Nagai, Gunma, Japan, 12x50 binoculars);
2018
Dec. 31.72, 5.4, 35' (M. Lehky, Pavlovice, Czech Republic, naked eye);
     31.61, 5.0, 40' (S. Yoshida, Ibaraki, Japan, naked eye);
     30.71, 5.4, 30' (M. Lehky, Pavlovice, Czech Republic, naked eye);
     29.82, 5.1, 45' (J. J. Gonzalez, Leon, Spain, 12x45 monocular);
     28.90, 5.6, -- (W. Hasubick, Buchloe, Germany, naked eyes);
     28.50, 5.2, 25' (Y. Nagai, Gunma, Japan, 12x50 binoculars);
     26.72, 5.4, 26' (W. Hasubick, Buchloe, Germany, 8x32 binoculars);
     23.68, 6.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     20.08, 4.2, 45' (M. Goiato, Arašatuba, Brazil, 7x50 binoculars; moonlight);
     19.12, 4.1:, 50' (M. Goiato, Arašatuba, Brazil, 7x50 binoculars; moonlight);
     18.12, 3.8:, 70' (M. Goiato, Arašatuba, Brazil, naked eye; moonlight);
     18.08, 3.9:, 60' (M. Goiato, Aracatuba, Brazil, 4x50 binoculars; moonlight);
     16.19, 3.6, > 90' (M. Goiato, Aracatuba, Brazil, naked eye);
     16.06, 4.1, 60' (W. Souza, Sao Paulo, Brazil, 10x42 binoculars);
     15.80, 4.1, 30' (R. Haver, Frasso Sabino, Italy, naked eye);
     15.43, 4.4, 40' (Y. Nagai, Gunma, Japan, 12x50 binoculars);
     15.31, 4.0, & 30' (S. J. O'Meara, Maun, Botswana, naked eye; moonlight);
     14.31, 3.9, & 1 deg (S. J. O'Meara, Maun, Botswana, naked eye; crescent moon);
     14.13, 3.7, > 90' (M. Goiato, Aracatuba, Brazil, naked eye);
     14.00, 4.1, 75' (J. J. Gonzalez, Leon, Spain, 12x45 monocular);
     13.98, 4.6, 30' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
     13.79, 4.6, 56' (W. Hasubick, Buchloe, Germany, naked eyes);
     13.57, 4.2, 45' (Y. Nagai, Gunma, Japan, 12x50 binoculars);
     13.26, 4.5, 54' (M.-T. Hui, Kitt Peak, AZ, USA, naked eye);
     12.70, 5.0, 28' (W. Hasubick, Buchloe, Germany, 8x32 binoculars);
     12.47, 4.3, 40' (Y. Nagai, Gunma, Japan, 12x50 binoculars);
     12.35, 4.4, 30' (S. J. O'Meara, Maun, Botswana, naked eye; crescent moon);
     11.86, 4.1, 70' (J. J. Gonzalez, Leon, Spain, 12x45 monocular);
     11.85, 4.7, 25' (R. Haver, Roma, Italy, 10x50 binoculars);
     11.38, 4.5, 1 deg (S. J. O'Meara, Maun, Botswana, naked eye);
     11.07, 3.9, 90' (M. Goiato, Aracatuba, Brazil, naked eye);
     11.01, 4.5:, 60' (W. Souza, Santa Rita do Sapucai, Brazil, naked eye);
     10.54, 4.4, 80' (Y. Nagai, Gunma, Japan, naked eye);
     10.46, 5.6, 25' (Y. Nagai, Gunma, Japan, 135-mm camera lens + CCD);
     10.01, 5.0: 20' (W. Souza, Sao Paulo, Brazil, 10x42 binoculars);
      9.21, 4.3, 60' (M. Goiato, Aracatuba, Brazil, 4x50 binoculars);
      8.55, 5.8, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
      7.81, 4.4, 60' (T. Scarmato, Calabria, Italy, 7x50 binoculars);
      7.72, 5.1, 20'.7 (W. Hasubick, Buchloe, Germany, 10x50 binoculars);
      7.49, 5.4, 25' (Y. Nagai, Gunma, Japan, 12x50 binoculars);
      7.04, 4.4, 60' (M. Goiato, Aracatuba, Brazil, 4x50 binoculars);
      6.85, 5.3, & 15' (S. J. O'Meara, Maun, Botswana, naked eye);
      6.83, 5.0, 65' (J. J. Gonzalez, Leon, Spain, 12x45 monocular);
      6.04, 4.5, 60' (M. Goiato, Aracatuba, Brazil, 4x50 binoculars);
      3.48, 5.0, 65' (A. Kammerer, Arthurs Pass, New Zealand, naked eyes);
      2.86, 4.9, 40' (T. Scarmato, Calabria, Italy, 7x50 binoculars; light pollution);
      1.50, 5.6, 28' (S. Yoshida, Gunma, Japan, 10x70 refractor);
Nov. 30.80, 4.8, 110' (J. J. Gonzalez, Asturias, Spain, 12x45 monocular);
     30.59, 6.3, 35' (K. Yoshimoto, Yamaguchi, Japan, 0.11-m astrograph + CCD; remotely from Siding Spring);
     30.43, 5.6, 28' (S. Yoshida, Gunma, Japan, 10x70 refractor);
     28.88, 6.8, 11' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     28.44, 5.2, 28' (A. Kammerer, Mt. Taranaki, New Zealand, naked eyes);
     28.08, 5.3, 45' (M. Goiato, Aracatuba, Brazil, 4x50 binoculars);
     27.03, 5.4, 45' (M. Goiato, Aracatuba, Brazil, 4x50 binoculars; visible to naked eye);
     26.96, 6.4, 15' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
     26.00, 5.4, 40' (M. Goiato, Aracatuba, Brazil, 4x50 binoculars);
     25.47, 6.9, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
     16.00, 5.7, 32' (J. J. Gonzalez, Asturias, Spain, 12x45 monocular);
     14.08, 6.7, 28' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     13.98, 6.8, 10' (W. Souza, Sao Paulo, Brazil, 0.10-m refractor);
     13.08, 6.8, 25' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     13.00, 6.2, 27' (J. J. Gonzalez, Asturias, Spain, 12x45 monocular);
     12.04, 6.8, 25' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
      6.89, 8.4, 10' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
      6.06, 7.8, 20' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
      4.01, 7.4, 15' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars);
      3.63, 8.5, 7' (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      3.59, 8.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 31.09, 8.1, 14' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     30.09, 8.2, 12' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     29.56, 9.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     29.06, 8.6, 8' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars; clouds);
     28.59, 9.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     20.66, 10.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     20.11, 9.2, 8' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     18.59, 10.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     16.07, 9.6, 7' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     15.73, 9.8, 9'.8 (K. Yoshimoto, Yamaguchi, Japan, 0.50-m reflector + CCD; remotely from Siding Spring, NSW);
     13.21, 10.3, 4' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      7.71, 11.9, 3'.0 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      6.63, 11.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      6.61, 11.4, 1'.7 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      6.21, 11.4, 2' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      4.00, 10.6, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      2.66, 11.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.59, 12.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 20.05, 13.7, 0'.5 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     19.12, 11.6, 2'.0 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     17.70, [13.4, ! 0'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     16.70, [13.6, ! 0'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     16.68, 13.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     10.10, 12.4, 1'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      5.75, 14.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 26.71, 15.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     17.73, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 14.72, 18.8, 0'.3 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
June 21.74, 19.7, 8" (H. Sato, Tokyo, Japan, 0.51-m astrograph + CCD, remotely at Siding Spring, NSW);
 
 
COMET 47P/Ashbrook-Jackson
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Jan.  1.52, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Dec. 17.54, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 29.61, 15.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 30.65, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 18.69, 16.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June 15.73, 16.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 48P/Johnson
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Feb.  2.43, 15.6, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
Jan. 27.42, 15.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.46, 15.0, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
2018
Dec.  8.42, 14.6, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
Nov.  3.86, 10.4, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Oct. 21.46, 13.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     16.00, 11.1, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      7.45, 13.5, 0'.7 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      3.93, 10.6, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Sep. 19.02, 10.3, 7' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     17.65, 13.3, 1'.0 (S. Yoshida, Gunma, Japan, 0.40-m reflector; low alt.);
      9.98, 10.1, 7' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Aug. 21.04, 13.2, 0'.7 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     20.12, 9.6, 7' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     17.64, 12.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     15.02, 9.7, 7' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     10.05, 9.8, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      8.06, 9.7, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
July 22.14, 9.8, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     20.69, 13.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     18.13, 10.5, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     14.70, 13.3, 1'.1 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
     13.69, 13.3, 0'.5 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
June 19.09, 11.5, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      2.74, 14.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr. 21.78, 16.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2011
Aug.  1.05, 14.2, 0'.6 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
 
 
COMET 49P/Arend-Rigaux
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
May   9.58, 18.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  2.80, 18.1, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
2012
Apr. 24.87, 17.9, 0'.1 (V. Nevski, Vitebsk, Belarus, 0.30-m reflector + CCD);
     12.87, 17.4, 0'.2 (V. Nevski, Vitebsk, Belarus, 0.30-m reflector + CCD);
2011
Dec. 23.82, [13.4, ! 1'.0 (M.-T. Hui, Mt. Mulan, Wuhan, China, 13.0-cm reflector; comet close to a mag-12.4 star);
      7.21, 10.1, 8' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Nov. 25.83, 13.0, 1'.2 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     24.83, 13.3, 1'.2 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     24.20, 10.2, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      8.21, 10.8, 5' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
Oct.  9.18, 11.7, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      8.78, 12.9, 1'.1 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      7.78, 12.9, 1'.4 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      1.17, 12.0, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Sep. 30.14, 14.0, 0'.5 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
 
 
COMET 50P/Arend
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2015
Nov. 15.48, 17.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 51P/Harrington
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2015
June 23.74, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 52P/Harrington-Abell
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2014
Mar. 14.80, 16.1, -- (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
      6.76, 15.9, 0'.2 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
Feb. 20.77, 15.0, 0'.6 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
Jan. 31.85, 15.0, 0'.4 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     27.88, 15.0, 0'.6 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     24.68, 15.6, 0'.5 (Sergey Shurpakov, Baran', Belarus, 0.20-m reflector + CCD);
     18.77, 15.0, 0'.6 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
      5.81, 15.2, 0'.6 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
      1.83, 15.3, 0'.7 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
2013
Dec. 29.50, 15.4, 0'.5 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
Nov. 16.64, 16.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 53P/Van Biesbroeck
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
Dec.  3.42, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct.  2.48, 14.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep.  8.52, 14.5, 0'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
      1.51, 14.0, 0'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Aug. 28.91, 13.4, 0'.7 (M. L. Paradowski, Dabrowa, Poland, 0.30-m reflector);
     26.89, 13.1, 0'.64 (M. L. Paradowski, Dabrowa, Poland, 0.30-m reflector);
     25.83, 13.9, 0'.4 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      1.57, 14.4, 1'.0 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
July 30.55, 13.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     23.70, 13.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     14.72, 14.3, 0'.8 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
      9.65, 13.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.66, 13.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.02, 12.9, 0'.9 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
May  28.71, 14.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 30.79, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 56P/Slaughter-Burnham
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
Dec. 17.64, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov. 17.63, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 14.75, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 22.76, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July  9.71, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 57P/du Toit-Neujmin-Delporte
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2015
Oct. 18.53, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug.  1.76, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 25.72, 16.1, 0'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
     11.68, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 58P/Jackson-Neujmin
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Aug. 18.81, 15.1, 0'.7 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
     12.50, 18.3, 0'.2 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      9.76, 15.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      9.50, 16.3, 0'.5 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
July 27.82, 12.5, 1.5'(P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     26.82, 12.4, 1.5'(P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     25.82, 12.5, 1' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     25.14, 10.3, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     23.82, 12.6, 1.5'(P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     21.34, 12.3, 1' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     20.82, 12.4, 1'.5 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     19.83, 12.4, 1'.5 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     19.77, 11.4, 2'.4 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector; alt. 17.6 deg);
     18.83, 12.2, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     17.83, 12.2, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     16.83, 12.2, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     15.84, 12.0, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     14.83, 11.9, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     13.84, 11.7, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     12.84, 11.7, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     12.35, 12.2, 1' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     11.35, 12.0:, -- (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
      2.78, 11.9, 2'.2 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector; alt. 16.5 deg);
June 22.83, 11.2, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     21.83, 11.1, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     21.77, 10.9, 2'.6 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector; alt. 13 deg);
     20.83, 11.2, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     18.83, 11.3, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     13.83, 11.1, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
      1.82, 10.5, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
May  31.36, 10.2, 2'.5 (M. Goiato, Aracatuba, Brazil, 0.22-m reflector; alt. 24 deg);
     30.82, 10.5, 2'.5 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     29.82, 10.7, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     28.82, 10.7, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     26.82, 10.5, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     24.82, 10.7, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     14.82, 10.6, 2'.5 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     13.81, 10.8, 2 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
      3.35, 10.1, 3' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector; comet alt. 20 deg);
      2.82, 10.5, 2'.5 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
      1.83, 10.4, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
Apr. 29.82, 10.7, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     28.79, 10.4, 3'.4 (C. Wyatt, Walcha, NSW, Australia, 0.25-m reflector);
     27.83, 10.8, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     26.83, 10.6, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     25.78, 10.6, 2'.6 (C. Wyatt, Walcha, NSW, Australia, 0.25-m reflector);
     24.77, 10.7, 2'.5 (C. Wyatt, Walcha, NSW, Australia, 0.25-m reflector);
     22.83, 10.7, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     20.83, 10.9, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     19.83, 10.8, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     18.83, 10.9, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     18.81, 12.1, 12" (H. Sato, Tokyo, Japan, remotely with a 0.51-m astrograph + CCD at Siding Spring, NSW);
     16.83, 10.8, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     15.83, 11.0, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     14.84, 10.8, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     13.82, 10.6, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     10.80, 11.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 59P/Kearns-Kwee
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Jan.  2.71, 16.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Dec.  9.67, 16.9, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
Nov. 14.71, 16.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 20.79, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 16.77, 17.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      5.80, 17.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 25.79, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     13.78, 17.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 60P/Tsuchinshan
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
May  19.51, 16.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      5.59, 15.5, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
Mar. 31.57, 13.8, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
     29.87, 13.7, 0'.5 (W. Hasubick, Buchloe, Germany, 44-cm rreflector);
Jan. 26.74, 13.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      9.74, 13.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      6.84, 13.6, 0'.6 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
2018
Dec. 15.78, 13.7, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
     14.25, 12.8, 0'.7 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.83, 15.0, 0'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + V filter + CCD);
Nov.  3.76, [13.7, ! 0'.7 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Oct. 28.79, 15.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      6.75, 16.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 61P/Shajn-Schaldach
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2015
Nov.  2.54, 15.1, 0'.9 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + V filter + CCD);
Oct.  8.72, 15.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 18.61, 14.6, 0'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
 
 
COMET 62P/Tsuchinshan
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Apr. 22.57, 17.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 26.65, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     13.71, 16.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.68, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb. 17.75, 13.4, 2'.9 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     13.68, 13.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     12.75, 13.6, 2'.5 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
Jan. 26.77, 12.5, 3'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     20.80, 12.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     18.18, 10.7, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     13.78, 12.0, 3'.4 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     12.77, 12.2, 3'.3 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
2017
Dec. 29.78, 11.4, 4'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     22.77, 11.7, 5'.8 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     20.16, 9.7, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     18.78, 11.3, 2'.7 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     16.81, 11.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     16.80, 12.6, 2'.6 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     16.19, 9.7, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Nov. 26.48, 10.8, 2'.5 (C. Hergenrother, Tucson, AZ, U.S.A., 0.35-m reflector);
     26.20, 9.8, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     24.78, 10.4, 4' (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     24.77, 11.1, 4'.2 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     24.73, 11.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     21.74, 11.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     20.73, 11.7, 2'.6 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     16.16, 9.2, 7' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
     14.12, 9.6, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     11.79, 11.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.50, [10.5, -- (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
Oct. 30.79, 12.0, 2'.7 (K. Harikae, Chiba, Japan, 0.15-m reflector + digital camera);
     29.78, 11.7, 3'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + V filter + CCD);
     28.46, [10.5, -- (C. Hergenrother, Tucson, AZ, U.S.A., 30x125 binoculars);
     26.78, 11.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     26.77, 11.5, 2'.4 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     23.22, 10.2, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     17.81, 12.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     16.09, 13.8, 0'.3 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      7.82, 12.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 30.80, 13.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 63P/Wild
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2013
June  3.93, 10.3, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
May  17.45, 12.6, 1'.7 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     11.89, 11.9, 1'.7 (M. L. Paradowski, Dabrowa, Poland, 0.30-m reflector);
      3.88, 11.8, 2' (U. Pilz, Leipzig, Germany, 32-cm reflector);
Apr.  9.51, 13.4, 2'.0 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
      1.86, 12.4, < 1' (Johan Karnfelt, Gothenburg, Sweden, 40-cm reflector);
Mar. 30.94, 11.0, 3' (J. J. Gonzalez, Zamora, Spain, 0.20-m reflector);
      8.81, 14.6, 0'.7 (S. Shurpakov, Baran', Belarus, 20-cm reflector + CCD);
      7.76, 14.1, 0'.5 (S. Shurpakov, Baran', Belarus, 20-cm reflector + CCD);
      6.76, 14.6, 0'.4 (S. Shurpakov, Baran', Belarus, 20-cm reflector + CCD);
      4.84, 14.9, 0'.5 (S. Shurpakov, Baran', Belarus, 20-cm reflector + CCD);
      1.85, 11.2, 3'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Feb. 27.82, 15.0, 0'.5 (S. Shurpakov, Baran', Belarus, 20-cm reflector + CCD);
     11.64, 13.4, 1'.7 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + + V filter + CCD);
Jan. 22.90, 15.5, 0'.4 (S. Shurpakov, Baran, Belarus, 20-cm reflector + CCD);
 
 
COMET 64P/Swift-Gehrels
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Apr.  3.59, 13.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 17.54, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     16.67, 13.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb. 26.81, 11.6, 3' (M. Lehky, Upice observatory, Czech Republic, 0.20-m reflector);
     24.97, 10.7, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     23.48, 12.4, 2'.3 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
Jan. 25.86, 9.8, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     14.02, 9.8, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     13.40, 10.7, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
      6.82, 9.0, 8' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      4.89, 9.3, 7' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
      1.87, 9.1, 7' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
2018
Dec. 31.60, 10.2, 6' (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     31.04, 9.5, 5' (M. Goiato, Arašatuba, Brazil, 0.22-m reflector);
     14.06, 9.0, 7' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     11.05, 9.0, 8' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
      7.56, 10.2, 6' (Y. Nagai, Gunma, Japan, 20x100 binoculars);
      6.84, 8.9, 8' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.39, 9.1, 6' (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Nov. 30.41, 9.1, 8' (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     28.83, 9.9, 5' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     17.79, 9.3, 5' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     16.92, 9.3, 5' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     16.12, 9.1, 7' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     15.64, 9.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     14.76, 9.3, 5' (M. Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars);
     13.14, 9.2, 7' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
      9.15, 9.2, 7' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
      6.77, 9.2, 6' (M. Lehky, Upice observatory, Czech Republic, 20x100 binoculars);
      6.04, 9.7, 5' (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
      3.83, 8.7, 7' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
      3.64, 9.9, 5' (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      3.37, 10.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 30.06, 10.0, 4' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     20.58, 10.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     20.15, 9.5, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     16.11, 8.9, 7' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     10.76, 11.6, 1'.4 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      7.46, 11.6, 2'.3 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      6.80, 13.4, 0'.37 (S. E. Shurpakov, Baran, Belarus, 25-cm reflector + CCD);
Oct.  6.54, 11.0, 2'.2 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      4.95, 12.0, 1'.3 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      3.85, 10.2, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.61, 11.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 29.74, 14.1, 0'.26 (S. E. Shurpakov, Baran, Belarus, 25-cm reflector + CCD);
     19.16, 12.2, 1'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     17.67, 12.2, 1'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     16.68, 13.2, 0'.8 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     16.57, 12.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     15.74, 12.6, 0'.68 (S. E. Shurpakov, Baran, Belarus, 20-cm reflector + CCD);
     10.00, 12.5, 1'.1 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      5.85, 13.5, 0'.8 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      3.33, 15.6, -- (J. G. Bosch, Collonges sous Saleve, France, 0.4-m reflector + CCD at San Pedro de Atacama Chile);
Aug. 20.06, 13.1, 1'.1 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     17.70, 13.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     15.65, 13.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     14.95, 13.2, 0'.6 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; in outburst);
     13.69, 16.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June 21.75, 19.2, ! 4".9 (H. Sato, Tokyo, Japan, 0.51-m f/6.8 astrograph + CCD; remotely at Siding Spring, NSW);
 
 
COMET 65P/GUNN
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Oct.  6.51, 16.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 17.66, 16.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 21.77, 16.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
July  8.47, 15.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  20.64, 14.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr. 19.71, 15.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
May  22.58, 16.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar.  7.63, 16.1, 0'.5 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
 
 
COMET 66P/du Toit
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Aug. 26.74, 15.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     20.13, 11.5, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
July 22.13, 10.0, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     18.12, 9.9, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     15.77, 14.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     10.12, 9.7, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      2.75, 13.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr. 27.80, 12.0, 2'.5 (H. Sato, remotely with a 0.51-m astrograph at Siding Spring);
     22.29, 12.4, 1' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     20.75, 10.8, 3'.1 (K. Yoshimoto, Yamaguchi, Japan, 0.50-m reflector + CCD, at Siding Spring);
     10.67, 13.1, 1'.73 (K. Yoshimoto, Yamaguchi, Japan, 0.50-m reflector + CCD, at Siding Spring);
Mar. 26.75, 15.5, 0'.34 (K. Yoshimoto, Yamaguchi, Japan, 0.50-m reflector + CCD, at Siding Spring);
 
 
COMET 67P/Churyumov-Gerasimenko
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
Mar.  7.66, 15.3, 0'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
Feb. 27.69, 14.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     10.60, 14.7, 1'.0 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
2015
Nov. 20.73, 12.5, 1'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      3.77, 12.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 15.14, 11.7, 1'.3 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     13.82, 12.9, 1'.0 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + V filter + CCD);
     11.78, 13.0, 1'.0 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      6.83, 12.5, 1'.3 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + V filter + CCD);
      3.77, 12.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 21.77, 11.1, 1'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      8.16, 11.2, 1'.1 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Aug. 27.12, 13.0, 0'.9 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     26.81, 11.8, 0'.8 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector);
      7.22, 13.7, 0'.1 (J. Qvam, Roque de los Muchachos, La Palma, Spain, 2.56-m reflector + CCD + V filter; moonlight);
July 25.80, 13.4, 0'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
     18.77, 13.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     11.76, 13.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June 23.76, 14.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2014
June 28.91, 16.0, 0'.1 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter);
 
 
COMET 68P/Klemola
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Nov.  4.36, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 25.81, 10.4, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Sep. 28.84, 10.6, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     25.42, 13.3, 1'.0 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     25.39, 14.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.56, 14.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.80, 13.1, 0'.4 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      3.95, 10.8, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Aug. 27.94, 11.1, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     22.92, 11.3, 2' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     10.44, 14.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.96, 11.7, 2' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
July 30.01, 11.8, 2' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     25.59, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     12.62, 14.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June 13.62, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.61, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  16.66, 16.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      9.71, 16.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.73, 17.0, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
 
 
COMET 70P/Kojima
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2015
Mar. 20.63, 15.8, 0'.5 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
Feb. 14.77, 16.4, 0'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
Jan.  2.74, 16.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2014
Nov. 13.77, 17.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 18.80, 17.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 23.80, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     22.79, 17.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 71P/Clark
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Jan.  1.39, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Dec. 30.37, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov.  5.38, 14.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 26.39, 12.7, 0'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector; near limit; moonlight; low alt.);
Sep. 30.41, 14.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.42, 13.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 23.04, 11.1, 2' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     12.47, 12.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 26.08, 10.6, 3' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     22.93, 9.9, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     18.51, 11.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     15.01, 10.5, 3' (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
     14.94, 9.8, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      7.51, 11.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.04, 10.1, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
June 28.08, 10.3, 4' (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
     14.97, 10.4, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      2.67, 11.6, 1'.4 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
May  28.70, 11.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     27.97, 11.5, 1'.3 (M. L. Paradowski, Dabrowa, Poland, 30-cm reflector; comet alt. 12 deg);
     24.02, 11.2, 2'.2 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     18.99, 12.2, 1'.5 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     18.63, 12.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     17.99, 12.0, 0'.7 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      6.59, 12.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.74, 12.2, 1'.2 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Apr. 29.80, 14.4, 0'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.50-m reflector + CCD at Siding Spring);
     28.13, 12.0, 0'.9 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      3.72, 14.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb. 11.78, 16.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  6.83, 17.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
Dec. 17.82, 17.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 72P/Denning-Fujikawa
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2015
Nov.  2.57, 18.3, 0'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
Aug.  2.77, 17.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 25.77, 15.3*, 0'.5 (M. Tsumura, Wakayama, Japan, 18-cm reflector + CCD);
     15.75, 15.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 73P/Schwassmann-Wachmann
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Jan.  6.54, 18.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Oct. 25.65, 16.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr.  1.84, 11.9, 1'.2 (A. Pearce, Nedlands, W. Australia, 0.2-m reflector);
Mar. 31.86, 11.6, 2' (A. Pearce, Nedlands, W. Australia, 0.2-m reflector);
     30.35, 12.0, 1' (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
     24.86, 11.5, 1'.5 (A. Pearce, Nedlands, W. Australia, 0.2-m reflector);
      3.83, [10.5, ! 1'.4 (S. Yoshida, Mt. Hanadate, Ibaraki, Japan, 0.40-m reflector; low alt.);
Feb. 11.85, 13.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     10.85, 13.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      6.84, [12.2, ! 1'.1 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
      6.83, 13.8, 1'.4 (K. Harikae, Funabashi, Chiba, Japan, 0.15-m reflector + digital camera + green channel);
      3.83, 13.3, 1'.2 (K. Harikae, Funabashi, Chiba, Japan, 0.15-m reflector + digital camera + green channel);
Jan. 24.84, 13.7, 0'.6 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
      7.25, 11.4, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      6.85, 14.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
Dec. 10.85, 15.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 73P/Schwassmann-Wachmann [component BT]
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2017
Feb. 21.23, 9.8, 3'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; alt. 9 deg; moonlight);
     11.85, 12.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     10.85, 12.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 74P/Smirnova-Chernykh
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Aug.  3.51, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  25.55, 16.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      9.63, 16.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 17.72, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
May  26.53, 16.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 25.56, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     11.54, 16.0, 0'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
Feb.  7.66, 16.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  3.70, 16.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Nov. 24.73, 16.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr. 15.47, 16.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
Oct. 11.73, 17.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 76P/West-Kohoutek-Ikemura
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Feb.  1.62, 17.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Dec. 27.70, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov. 21.71, 17.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      9.78, 17.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 25.72, 17.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.77, 18.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 26.75, 18.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 77P/Longmore
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
May  14.54, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.49, 13.4, 0'.7 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      1.48, 14.4, 0'.5 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Apr.  8.69, 14.6, 0'.5 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
Mar.  7.68, 14.9, 0'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
2015
Nov. 27.79, 17.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 78P/Gehrels
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Feb. 22.49, 16.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  3.64, 16.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Dec. 14.69, 16.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov. 15.74, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 25.77, 15.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep.  6.81, 14.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 16.78, 14.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb.  2.41, 13.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  6.81, 11.7, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.39, 14.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Nov. 30.38, [13.8, ! 0'.8 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Oct. 21.42, 14.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.44, 14.1, 0'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      6.82, 15.6, 0'.26 (S. E. Shurpakov, Baran, Belarus, 25-cm reflector + CCD);
Sep. 17.66, [13.8, ! 0'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      5.85, 14.7, 0'.3 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
July 31.67, 15.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     14.63, 16.4, 0'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
June 21.69, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2012
Apr.  8.85, 10.8, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Mar. 21.77, 11.6, 2' (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     20.78, 11.6, 2' (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     19.77, 11.3, 2'.5 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     15.79, 11.1, 2'.5 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     11.84, 10.5, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Feb. 20.83, 10.5, 5' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     11.46, 11.1, 3'.1 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector);
     10.75, 11.0, 2' (U. Pilz, Leipzig, Germany, 32-cm reflector);
Jan. 14.71, 11.2, 4' (U. Pilz, Leipzig, Germany, 32-cm reflector);
     10.79, 10.1, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.97, 10.8, 1'.5 (M. Goiato, Aracatuba, Brazil, 22-cm reflector; moonlight);
2011
Dec. 22.80, 10.5, 5' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
Nov. 26.76, 9.8, 6' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
     25.74, 11.6, 1'.2 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     24.41, 10.9, 2'.0 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     23.96, 10.8, 3' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     21.85, 11.8, 2' (U. Pilz, Leipzig, Germany, 32-cm reflector);
     17.82, 9.8, 5' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     16.00, 11.0, 4' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     14.00, 11.0, 4' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     13.72, 12.7, 1' (U. Pilz, Leipzig, Germany, 32-cm reflector);
Oct. 29.97, 10.3, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     27.12, 10.8, 3' (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
     26.51, 10.9, 2'.0 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector);
     22.83, 12.5, 1'.5 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     20.96, 10.5, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     16.76, 11.4, 2' (U. Pilz, Leipzig, Germany, 32-cm reflector);
     15.81, 10.3, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      7.72, 11.5, 1'.8 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      2.94, 11.1, 2'.5 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
      2.85, 11.7, 2' (V. Nevski, Vitebsk, Belarus, 0.30-m reflector);
      1.88, 11.1, 2'.5 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
      1.08, 11.0, 3'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Sep. 30.90, 11.2, 2'.5 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     29.93, 11.4, 2'.2 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     28.92, 11.5, 2' (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     26.91, 11.6, 2'.0 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     25.89, 11.3, 3'.2 (M. L. Paradowski, Muczne, Poland, 0.20-m reflector);
     25.88, 11.6, 2'.0 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     24.91, 11.7, 2'.2 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     24.87, 10.8, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     23.83, 12.4, 2' (U. Pilz, Leipzig, Germany, 32-cm reflector);
     21.90, 12.2, 1'.5 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     19.90, 10.8, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     19.12, 11.5, 2' (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
      7.06, 12.5, 1'.2 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      3.04, 12.8, 1'.0 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.17, 12.6, 1' (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
Aug. 31.91, 14.0, 0'.7 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     28.93, 14.0, 0'.6 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     26.94, 13.2, 1'.0 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     25.97, 14.0, 0'.7 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
 
 
COMET 81P/Wild
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2017
July 14.68, 17.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June  2.72, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
July  2.91, 8.1, 9' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
June 27.92, 8.2, 8' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
May  31.92, 10.2, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     22.47, 11.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.49, 12.0, 1'.0 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      2.46, 11.6, 1'.9 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      1.50, 11.9, 1'.2 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Apr. 28.80, 13.3, 0'.46 (Sergey E. Shurpakov, Baran', Belarus, 15-cm reflector + CCD);
      9.52, 11.7, 1'.3 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector; thin clouds; difficult);
      6.81, 12.5, 0'.6 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      4.83, 13.9, 0'.37 (Sergey E. Shurpakov, Baran', Belarus, 15-cm reflector + CCD);
Mar. 22.46, [12.5, ! 0'.9 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector; strong moonlight);
      7.49, 13.4, 1'.0 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
Feb. 29.86, 12.7, 1'.1 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
2015
Dec. 31.57, 14.1, 0'.8 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
 
 
COMET 84P/Giclas
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Dec. 20.18, 17.5, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     12.66, 16.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov. 21.69, 17.0, 0'.4 (K. Yoshimoto, Kumage, Yamaguchi, Japan, 0.20-m reflector + CCD);
Oct. 30.74, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 20.51, 16.6, 0'.5 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      8.80, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 24.48, 16.4, 15" (H. Sato, Tokyo, Japan, remotely 0.43-m f/6.8 astrograph + CCD at Mayhill, NM);
     20.74, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 27.46, 16.4, 15" (H. Sato, Tokyo, Japan, remotely 0.43-m f/6.8 astrograph + CCD at Mayhill, NM);
2013
Dec. 26.77, 15.6, ! 0'.54 (Sergey E. Shurpakov, Baran, Belarus, 20-cm reflector + CCD);
     13.86, 16.4, ! 0'.18 (Sergey E. Shurpakov, Baran, Belarus, 20-cm reflector + CCD);
     13.78, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov.  4.65, 16.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 26.70, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 87P/Bus
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
June 13.25, 17.8, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     12.27, 17.8, 0.17' (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      8.23, 17.3, 0'.7 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
May  21.23, 17.6, 0'.30 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     16.27, 17.3, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     15.25, 17.3, 0'.40 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     14.22, 16.9, 0'.63 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Mar. 16.65, 17.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.70, 18.0, 15" (H. Sato, Tokyo, Japan, remotely with 0.51-m astrograph + CCD at Siding Spring);
 
 
COMET 88P/Howell
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 16.80, 10.0, 5' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     13.78, 10.1, 5' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
      7.79, 10.2, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.36, 11.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.05, 12.3, 3'.5 (H. Sato, Tokyo, Japan, remotely with a 0.43-m astrograph + CCD at Mayhill, NM);
2020
Dec. 25.42, 11.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     17.70, 10.7, 0'.9 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     16.79, 9.3, 6' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     14.38, 10.7, 2'.8 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
      8.77, 9.1, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Nov. 21.37, 10.9, 1'.0 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector; city light pollution);
     17.80, 8.9, 7' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     15.44, 9.4, 4'.7 (C. Wyatt, Walcha, NSW, Australia, 40-cm reflector);
     14.42, 9.2, 4' (C. Wyatt, Walcha, NSW, Australia, 40-cm reflector);
     10.42, 9.4, 4'.8 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     10.36, 10.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      8.40, 9.3, 4'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      5.96, 10.0, 2'.5 (M.Goiato, Aracatuba, Brazil, 0.22-m reflector);
      5.92, 10.6, 5' (J. G. de S. Aguiar, Polo Astronomico de Amparo, Brazil, 0.35-m reflector);
      3.40, 8.9, 3'.4 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
Oct. 18.92, 9.5, 2' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     17.96, 9.5, 3' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     17.92, 9.4, 2' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     16.92, 9.2, 2' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     15.79, 8.8, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     13.92, 9.3, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     12.92, 9.2, 2' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     11.94, 9.3, 3' (M. Goiato, Aracatuba, Brazil 0.22-m reflector);
     11.92, 9.2, 2' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     10.93, 9.1, 2' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     10.80, 8.8, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      9.93, 9.0:, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      3.94, 9.1, 3'.5 (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
Sep. 26.94, 9.2, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars; moonlight);
     25.94, 9.2, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars; moonlight);
     24.94, 9.2, 3' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     23.94, 9.1, 3' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     21.42, 9.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.85, 8.7, 8' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      6.94, 9.2, 3'.5 (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      6.94, 9.2, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      5.94, 9.2, 2' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      4.94, 9.2, 2' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      3.94, 9.2, 3' (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      2.94, 9.2, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      1.94, 9.3, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binocular; moonlight);
Aug. 30.94, 9.3, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     29.94, 9.3, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     28.94, 9.4, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
     28.45, 10.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     27.92, 9.4, -- (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     26.42, 10.9, 4'.6 (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD);
     23.92, 9.6, -- (J. G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars; moonlight);
     20.45, 10.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     19.48, 9.3, 4' (K. Yoshimoto, Yamaguchi, Japan, 20x100 binoculars);
     13.88, 9.4, 7' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      8.98, 10.3, 3' (M. Goiato, Aracatuba, 0.22-m reflector);
      5.45, 11.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 30.37, 10.3, 4' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector; moonlight);
     26.45, 10.3, 3  (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     25.45, 10.3, 3'.6 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     24.91, 10.1, 3'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     24.44, 10.5, 4' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     23.44, 10.6, 4' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     21.35, 10.2, 4'.6 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     20.43, 10.6, 4' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     19.43, 10.5, 4' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     19.38, 11.4, 2'.9 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     18.43, 10.6, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     17.43, 10.6, 4' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     16.45, 10.7, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     15.50, 10.7, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     14.48, 10.8, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     13.45, 10.8, 4' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     12.98, 11.2, 2' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     12.45, 11.0, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
      9.45, 10.8, 4' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
      7.35, 11.4, 4'.3 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
June 25.84, 15.7, 0'.42 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter; twilight);
     24.52, 11.6, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     22.46, 11.5, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     21.45, 11.6, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     20.98, 11.6, 2' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     20.94, 10.7, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     20.45, 11.7, 2'.6 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     19.47, 11.8, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     18.47, 11.8, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     17.35, 11.8, 4' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     16.37, 11.7, 3' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     15.45, 11.8, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     15.23, 14.3, 1'.1 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     14.44, 11.8, 2' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     14.22, 13.7, 1'.9 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     13.46, 11.8, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     12.48, 11.9, 2'.5 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     12.24, 14.4, 1'.1 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     11.35, 11.9, 3' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     11.24, 14.5, 1'.1 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     10.26, 13.6, 2'.0 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      9.48, 12.2, 3' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
      9.24, 14.2, 1'.0 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      8.24, 14.7, 1'.0 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
May  28.44, 13.0, 1' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     26.46, 12.8, 1' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     24.46, 13.0, 1'.5 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     21.87, 13.0, 0'.3 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     21.27, 15.0, 1'.0 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     17.22, 14.6, 1'.2 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     16.31, 14.9, 0'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     14.51, 12.9, 1'.5 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     14.19, 14.7, 1'.0 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     13.50, 12.8, 1'.8 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     11.47, 13.0, 1'.5 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     10.39, 13.6, 0'.8 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
Apr. 27.46, 14.0, 1'.2 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     25.46, 14.0, 1' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     24.42, 14.2, 1'.2 (C. Wyatt, Walcha, NSW, Australia, 0.40-m reflector);
     23.46, 14.0, 1'.2 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     22.46, 14.0, 1'.5 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     22.43, 14.3, 1' (C. Wyatt, Walcha, NSW, Australia, 0.40-m reflector);
     20.46, 13.8, 1'.5 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     19.48, 13.9, 1'.2 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     19.42, 14.8, 0'.4 (C. Wyatt, Walcha, NSW, Australia, 0.40-m reflector);
     18.68, 14.2, 1'.0 (H. Sato, Tokyo, Japan, remotely with a 0.51-m astrograph + CCD at Siding Spring, NSW);
     18.48, 13.9, 1' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     16.48, 13.8, 1' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     15.54, 13.9, 1' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     15.46, 14.4, 0'.8 (C. Wyatt, Walcha, NSW, Australia, 0.40-m reflector);
      4.56, 14.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb.  6.83, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.74, 17.8, 15" (H. Sato, Tokyo, Japan, remotely with 0.51-m astrograph + CCD at Siding Spring);
Jan.  4.80, 18.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Dec. 27.78, 18.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
Jan.  2.51, 16.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2015
Nov. 11.98, [14.4, -- (W. Hasubick, Buchloe, Germany, 44-cm reflector);
Oct. 18.69, 12.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     13.69, 13.2, 2'.1 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + V filter + CCD);
Sep. 21.73, 13.2, 1'.3 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      8.05, 11.7, 2' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Aug. 27.13, [14.0, -- (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      8.23, 11.6, 1'.5 (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
      1.73, 12.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 25.75, 11.1, 4'.2 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + V filter + CCD);
     23.31, 11.0, 3' (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
     14.11, 9.6, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
June 23.73, 10.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     13.31, 11.0, 2' (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
May  24.35, 9.9, 3' (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
     16.35, 9.7, 3' (M. Goiato, Aracatuba, Brazil, 22-cm reflector; clouds);
     11.34, 10.0:, -- (A. Amorim, Florianopolis, Brazil, 0.18-m reflector);
      2.78, 10.2, 1'.2 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      1.34, 9.4, 2'.5 (A. Amorim, Florianopolis, Brazil, 0.18-m reflector);
Apr. 27.36, 9.3, 2' (A. Amorim, Florianopolis, Brazil, 0.18-m reflector);
     25.33, 9.4, 3' (A. Amorim, Florianopolis, Brazil, 0.18-m reflector);
     22.79, 10.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     21.33, 9.3, 5' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector; clouds);
     12.33, 9.3, 3'.5 (M. Goiato, Aracatuba, Brazil, 22-cm reflector; moonlight);
     12.32, 9.5, 2' (A. Amorim, Florianopolis, Brazil, 0.18-m reflector; moonlight);
     11.33, 9.5, 1' (A. Amorim, Florianopolis, Brazil, 0.18-m reflector; moonlight);
     10.34, 9.2:, 1' (A. Amorim, Florianopolis, Brazil, 0.18-m reflector; moonlight);
      9.33, 9.0, 2' (A. Amorim, Florianopolis, Brazil, 0.18-m reflector; moonlight);
      8.33, 9.0, 2' (A. Amorim, Florianopolis, Brazil, 0.18-m reflector; moonlight);
      3.31, 8.8, 4' (M. Goiato, Aracatuba, Brazil, 22-cm reflector; moonlight, clouds);
Mar. 29.31, 8.9, 5' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     26.74, 9.1, 2' (David A. J. Seargent, Cowra, NSW, Australia, 25x100 binoculars);
     26.33, 8.8, 2' (A. Amorim, Florianopolis, Brazil, 0.18-m reflector);
     25.32, 8.8, 2' (A. Amorim, Florianopolis, Brazil, 0.18-m reflector);
     22.31, 9.5, 3' (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
     19.32, 9.5:, -- (A. Amorim, Florianopolis, Brazil, 0.18-m reflector);
      1.33, 10.5, 2'.5 (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
Feb. 22.30, 10.8, 2' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
2014
Dec. 16.86, 15.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 90P/Gehrels
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Jan.  5.64, 17.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Nov.  4.67, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 26.73, 17.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
Dec. 17.45, 18.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 93P/Lovas
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2017
Apr. 15.44, 15.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 24.40, [13.5, ! 0'.8 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
      2.39, 14.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
Dec. 11.49, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.48, 15.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 25.71, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 94P/Russell
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2017
May  20.58, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar.  9.73, 17.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
Dec. 23.82, 17.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 96P/Machholz
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2017
Oct. 29.15, 2.5, 20' (M. L. Paradowski, measured from SOHO C3 images);
     28.75, 2.3, 22' (M. L. Paradowski, measured from SOHO C3 images);
     28.17, 2.1, 23' (M. L. Paradowski, measured from SOHO C3 images);
     28.00, 2.0, 23' (M. L. Paradowski, measured from SOHO C3 images);
     27.85, 2.2, 22' (M. L. Paradowski, measured from SOHO C3 images);
     27.59, 2.3, 19' (M. L. Paradowski, measured from SOHO C3 images);
     27.34, 2.4, 19' (M. L. Paradowski, measured from SOHO C3 images);
     27.27, 2.5, 19' (M. L. Paradowski, measured from SOHO C3 images);
     26.58, 2.6, 19' (M. L. Paradowski, measured from SOHO C3 images);
2012
Sep. 13.85, 10.8, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      3.38, 13.1, 3' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
Aug. 21.88, 10.5, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     20.37, 11.2, 7'.7 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     19.83, 12.5, 0'.8 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     19.39, 11.3, 3'.3 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      9.89, 10.2, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      6.36, 10.1, 5'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      5.47, 10.1, 1'.5 (Y. Nagai, Niigata, Japan, 300-mm camera lens + CCD);
      5.36, 10.2, 4' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      4.36, 9.8, 6' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      1.51, 9.2, 2' (M.-T. Hui, Luogang, Canton, China, 20.0-cm reflector; city light pollution and strong moonlight);
June 30.37, 9.6, 2' (M. Goiato, Aracatuba, Brazil, 22-cm reflector; alt. 11 deg);
     24.78, 13.3, 0'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
 
 
COMET 98P/Takamizawa
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2013
Oct. 27.42, 16.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June 12.56, 17.8, 0'.3 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
 
 
COMET 100P/Hartley
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
May  12.65, 16.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb. 18.78, 18.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 101P/Chernykh
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan.  9.66, 17.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2020
Oct. 30.78, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Oct. 22.56, 16.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 25.61, 16.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 29.72, 17.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     26.69, 17.5, -- (T. Ikemura, Shinshiro, Japan, 0.35-m reflector + CCD; measured by H. Sato);
 
 
COMET 102P/Shoemaker
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2013
Nov. 30.45, 18.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep.  8.01, 15.2, 0'.48 (M. L. Paradowski, Dabrowa, Poland, 0.15-m reflector + CCD + V filter);
 
 
COMET 103P/Hartley
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Feb. 17.63, 18.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  6.76, 18.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Dec. 28.80, 18.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2011
Apr. 23.85, 14.4, 1'.1 (J. Cerny, Senohraby, Czech Republic, 0.35-m reflector);
     19.85, 14.5, 0'.9 (J. Cerny, Senohraby, Czech Republic, 0.35-m reflector);
Mar. 29.86, 13.6, 1'.6 (J. Cerny, Senohraby, Czech Republic, 0.20-m reflector);
     24.81, 12:, 3' (U. Pilz, Leipzig, Germany, 32-cm reflector);
     23.80, 13.4, 1'.6 (J. Cerny, Senohraby, Czech Republic, 0.20-m reflector);
     21.79, 13.5, 1'.3 (J. Cerny, Senohraby, Czech Republic, 0.20-m reflector);
      7.83, 12.2, 2'.5 (J. Cerny, Senohraby, Czech Republic, 0.20-m reflector);
      5.85, 12.5, 2'.0 (J. Cerny, Maruka, Czech Republic, 0.20-m reflector);
      3.86, 11.4, 2'.9 (J. Cerny, Senohraby, Czech Republic, 0.20-m reflector);
Feb. 28.83, 12.2, 1'.9 (J. Cerny, Senohraby, Czech Republic, 0.20-m reflector);
      6.81, 11.0, 4' (J. Cerny, Senohraby, Czech Republic, 25x100 binoculars);
 
 
COMET 104P/Kowal
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
May   4.46, 13.1, 0'.5 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Mar. 21.44, 14.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     19.42, 14.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 105P/Singer Brewster
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
June  2.52, 16.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 106P/Schuster
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2014
Nov. 15.9, 18.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 28.75, 17.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 28.75, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 108P/Ciffreo
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2015
Jan. 11.42, 16.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2014
Dec.  6.60, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov. 29.77, 13.7, 0'.7 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     20.55, 14.3, 0'.9 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
Oct. 29.65, 14.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     25.76, [14.2, ! 0'.3 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Sep. 27.73, 15.0, 0'.8 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
     27.72, 14.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 31.74, 17.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     26.76, 17.2, 0'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
 
 
COMET 110P/Hartley
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2015
Jan.  1.57, 14.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2014
Dec.  6.64, 15.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov. 20.57, 15.7, 0'.5 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
     12.72, 15.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 29.72, 16.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      9.71, 16.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 20.69, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 112P/Urata-Niijima
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Jan. 27.07, 16.0, 1'.2 (H. Sato, Tokyo, Japan, remotely with a 0.43-m astrograph + CCD near Mayhill, NM, USA);
 
 
COMET 114P/Wiseman-Skiff
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Jan. 31.43, 14.0, 0'.5 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector; near limit);
2019
Dec. 30.81, 13.9, 0'68 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
Nov.  4.54, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 25.69, 17.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 115P/Maury
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Nov.  4.48, 17.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 21.14, 17.2, 0'.5 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     20.15, 17.1, 0'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     19.16, 16.7, 0'.5 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Aug. 25.19, 16.1, 0'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     15.24, 16.7, 0'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      7.24, 15.8, 0'.3 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      5.59, 15.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 12.91, [14.5, -- (W. Hasubick, Buchloe, Germany, 44-cm reflector);
 
 
COMET 116P/Wild
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
June  5.55, 13.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.55, [13.1, ! 1'.1 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
May  12.67, 13.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      5.99, 12.7, 0'.6 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      4.73, 13.7, 0'.8 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      1.67, 13.0, 0'.9 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Apr. 15.76, 13.4, 0'.6 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector; near limit);
      8.67, 13.8, 0'.5 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector; difficult, low in haze);
      7.75, 13.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 22.74, 13.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 27.78, 13.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      9.84, 13.3, 0'.7 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
2015
Oct. 31.82, 14.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2014
Dec. 13.64, 18.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 117P/Helin-Roman-Alu
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
June 10.21, 18.3, 0.33' (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      9.21, 17.7, 0.63' (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
2016
Nov. 19.63, 17.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2015
Nov.  3.54, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.50, 15.9, 0'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
2014
Nov. 15.43, 14.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 25.41, 13.5, 0'.5 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Sep. 28.45, 14.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     27.53, 13.2, 0'.6 (P. Camilleri, Warners Bay, Australia, 0.40-m reflector);
     23.54, 13.0, 0'.7 (P. Camilleri, Warners Bay, Australia, 0.40-m reflector);
     22.57, 13.0, 0'.7 (P. Camilleri, Warners Bay, Australia, 0.40-m reflector);
     14.44, 14.5*, 0'.8 (M. Tsumura, Wakayama, Japan, 35-cm reflector + CCD);
     13.45, 14.0*, 1'.0 (M. Tsumura, Wakayama, Japan, 35-cm reflector + CCD);
Aug. 20.09, 12.9, 0'.5 (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
     19.14, 12.8, 0'.5 (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
      2.63, 13.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 12.66, 14.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  31.74, 14.8, 0'.8 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
     17.73, 15.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr. 14.80, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.83, 15.2, 0'.3 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
2013
July  8.45, 14.3, 0'.6 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      3.39, 14.0, 0'.7 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
June  3.39, 14.0, 0'.7 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
2012
Apr. 24.85, 17.4, 0'.2 (V. Nevski, Vitebsk, Belarus, 0.30-m reflector + CCD);
 
 
COMET 118P/Shoemaker-Levy
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2017
Feb. 10.73, 17.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 119P/Parker-Hartley
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2015
Jan.  1.68, 18.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2014
Dec.  6.72, 18.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov.  3.77, 18.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  1.56, 17.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2013
Dec.  2.82, 17.3, ! 0'.43 (Sergey E. Shurpakov, Baran, Belarus, 20-cm reflector + CCD);
Oct. 27.56, 17.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 15.97, 18.8, 0'.2 (Sergey Shurpakov, Baran', Belarus, 0.20-m reflector + CCD);
 
 
COMET 123P/West-Hartley
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Aug.  4.45, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June 16.59, 15.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  19.46, 14.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      5.60, 13.7, -- (K. Kadota, Ageo, 0.25-m reflector + CCD);
      3.54, 13.4, 1'.4 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      2.50, 13.7, 1'.1 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Apr. 24.87, 13.5, 1'.5 (M. Lehky, Hradec Kralove, Czech Republic, 0.30-m reflector);
      8.73, 14.1, 1'.8 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD + green channel);
      7.62, 13.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.73, 14.3, 1'.5 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD + green channel);
      2.89, 11.5, 2' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      2.73, 13.5, 1'.4 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD + green channel);
Mar. 29.87, 13.5, 0'.4 (W. Hasubick, Buchloe, Germany, 44-cm rreflector);
     23.90, 11.5, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     17.59, 12.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      9.94, 11.8, 2'.2 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      8.76, 13.1, 1'.9 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD + green channel);
      5.17, 12.3, 1'.5 (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
Feb. 24.95, 12.4, 1'.2 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Jan. 28.86, 14.6, 0'.4 (J. Qvam, Nykirke, Norway, 0.5-m reflector + CCD + V filter);
     18.75, 13.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     14.06, 12.7, 1.1', (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; outburst);
2018
Dec. 29.69, 14.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov. 15.76, 16.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct.  1.78, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2011
May  31.86, 14.5, 0'.6 (J. Cerny, Korcula, Croatia, 0.35-m reflector);
     30.88, [14.5, ! 0'.5 (J. Cerny, Korcula, Croatia, 0.35-m reflector);
 
 
COMET 124P/Mrkos
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2014
Apr. 22.86, 16.8, -- (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR);
     16.89, 17.2, -- (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
Mar. 27.93, 15.8, -- (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     20.91, 15.6, -- (T. Lehmann, Weimar, Germany, 6-cm telephoto lens + CCD via DSLR green);
     15.54, 15.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      5.60, 16.1, 0'.5 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
Feb. 16.71, 17.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 15.75, 17.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2013
Dec. 28.73, 18.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 125P/Spacewatch
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Apr. 21.53, 18.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 128P/Shoemaker-Holt   [component b]
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
Dec. 17.59, 17.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 24.68, 17.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 129P/Shoemaker-Levy
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Oct. 29.49, 18.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug.  4.56, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 23.70, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     21.74, 15.8, 20" (H. Sato, Tokyo, Japan, remotely with 0.51-m astrograph at Siding Spring, NSW);
 
 
COMET 130P/McNaught-Hughes
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Dec. 15.46, 17.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2011
Aug.  1.12, 14.0, 0'.4 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
 
 
COMET 131P/Mueller
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Oct. 28.62, 17.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 134P/Kowal-Vavrova
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2014
June 19.55, 14.5*, 0'.5 (M. Tsumura, Wakayama, Japan, 35-cm reflector + CCD);
May  31.66, 14.0, 1'.3 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
     30.94, 12.6, 1'.2 (U. Pilz, Leipzig, Germany, 32-cm reflector);
     25.51, 13.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     18.64, 14.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.92, 12.8, 1'.0 (U. Pilz, Leipzig, Germany, 32-cm reflector);
      3.54, 12.6, 1'.1 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Apr. 26.66, 14.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     24.85, 14.1, 0'.3 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
Mar. 23.64, 14.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb. 12.75, 15.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2013
Nov. 30.84, 16.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     21.81, 16.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.81, 17.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 136P/Mueller
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
Dec. 24.47, 17.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     18.53, 17.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 11.67, 17.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 137P/Shoemaker-Levy
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Jan.  4.41, 17.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Oct. 28.44, 17.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug.  4.59, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 14.61, 17.2, 0'.3 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
Apr. 25.73, 19.7, -- (H. Sato, remotely with a 0.51-m astrograph at Siding Spring; stellar appearance);
 
 
COMET 139P/Vaisala-Oterma
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Jan. 14.44, 18.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Dec. 11.61, 18.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 141P/Machholz
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 16.81, 10.2, 4' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     13.79, 9.8, 6' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
      9.98, 10.4, 3' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      7.80, 10.1, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      3.38, 11.4, -- (Y. Mizuno, Kani, Japan, 32-cm reflector + CCD);
      2.98, 10.3, 3' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      1.40, 11.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2020
Dec. 28.42, 11.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     26.42, 11.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     25.43, 11.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     22.09, 13.8, 1'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     21.41, 12.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     21.10, 13.9, 1'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     20.10, 14.0, 1'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     19.11, 13.6, 3'.2 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     18.38, 12.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     18.10, 14.4, 1'.5 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     16.80, 10.8, 5' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     16.74, 12.5, 1'.0 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     16.38, 12.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     15.09, 14.2, 1'.2 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     14.39, 13.6, 0'.8 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
      8.78, 11.7, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
2015
Sep. 21.81, 11.8, 1'.1 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     12.78, 17.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD; component H);
     12.78, 13.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 28.17, 11.2, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     27.12, [13.5, -- (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     26.80, 12.0, 1'.5 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector);
July 25.79, 16.1, 0'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
     18.71, 16.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 143P/Kowal-Mrkos
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Apr. 21.59, 17.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 26.81, 18.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 144P/Kushida
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2017
Mar. 19.71, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb. 25.80, 15.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 24.82, 13.9, 0'.9 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
      9.83, 14.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
Dec. 16.82, 14.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      5.23, 10.8, 3' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
      2.83, 13.3, 1'.1 (S. Yoshida, Kita-karuizawa, Gunma, Japan, 0.40-m reflector; bright);
Nov. 30.23, 10.7, 4' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     17.79, 13.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.83, 12.2, 1'.0 (S. Yoshida, Kita-karuizawa, Gunma, Japan, 0.40-m reflector; bright star nearby);
      2.84, 13.6, 1'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
      2.23, 9.3, 8' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Oct. 20.83, 12.6, 0'.8 (S. Yoshida, Kita-karuizawa, Gunma, Japan, 0.40-m reflector; twilight);
     11.81, 12.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      6.83, 12.1, 2'.0 (K. Yoshimoto, Yamaguchi, Japan, 330-mm f/4.3 refractor + Nikon D5100 digital camera G channel);
      5.83, 11.7, 2'.8 (K. Yoshimoto, Yamaguchi, Japan, 180-mm f/2.8 lens + Nikon D5100 digital camera G channel);
      5.80, 12.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.20, 8.8, 8' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.84, 12.4, 1'.8 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
Sep. 29.20, 8.9, 8' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     28.16, 11.5, 0'.9 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      9.19, 9.2, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.81, 13.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 22.79, 14.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.81, 15.4, 0'.5 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
      7.79, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 145P/Shoemaker-Levy
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Mar.  4.59, 17.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  5.69, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Dec.  3.57, 14.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 17.68, 15.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sept. 2.73, 15.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 146P/Shoemaker-LINEAR
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
Nov. 19.70, 18.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug.  7.76, 16.8, 0'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
July 28.76, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      9.75, 15.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 149P/Mueller
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
May  11.65, 18.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2010
June 19.29, 18.4, < 0'.2 (A. Novichonok and D. Chestnov, remotely using a 35.5-cm reflector + CCD near Mayhill, NM, U.S.A.);
Mar. 21.66, 18.6*, 0'.2 (M. Tsumura, Wakayama, Japan, 35-cm reflector + CCD);
 
 
COMET 151P/Helin
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2015
Nov. 15.43, 17.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 154P/Brewington
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2014
Mar.  9.81, 14.4, 2' (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
Feb. 28.78, 13.0, 1'.0 (U. Pilz, Leipzig, Germany, 32-cm reflector);
     22.48, 14.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     19.76, 12.6, 4'.4 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     17.77, 13.1, 3'.5 (T. Lehmann, Weimar, Germany, 6-cm telephoto lens + CCD via DSLR green);
      2.46, 13.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 31.80, 12.5, 4'.2 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     27.79, 12.0, 5'.5 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     25.77, 11.4, 2'.5 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     15.78, 12.2, 4' (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     12.74, 11.5, 7' (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
      1.77, 11.4, 7'.5 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
2013
Dec. 30.73, 8.9, 13' (U. Pilz, Leipzig, Germany, 32-cm reflector);
     29.40, 12.4, 3'.5 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
     27.75, 11.0, 2'.5 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     23.72, 11.1, 2'.6 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     20.77, 10.7, 11' (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     16.72, 10.9, 8' (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     14.67, 13.9, ! 0'.71 (Sergey E. Shurpakov, Baran, Belarus, 20-cm reflector + CCD);
     13.78, 10.8, 10' (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
      7.98, 10.4, 4' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector; moonlight);
      4.95, 10.4, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      2.78, 10.9, 2'.5 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
      2.78, 10.8, 8' (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
      2.65, 12.4, ! 1'.7 (Sergey E. Shurpakov, Baran, Belarus, 20-cm reflector + CCD);
      1.80, 11.3, 4' (J. Karnfelt, Gothenburg, Sweden, 0.40-m reflector);
Nov. 27.00, 10.5, 4' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     25.78, 10.8, 9' (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     24.84, 10.8, 8' (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     24.84, 9.6, 8' (U. Pilz, Leipzig, Germany, 12-cm refractor);
     24.43, 11.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     21.00, 10.5, 3' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     13.80, 11.3, 8' (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     11.82, 11.2, 6' (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     10.85, 10.6, 8' (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
      9.78, 10.9, 9' (T. Lehmann, Weimar, Germany, 6-cm telephoto lens + CCD via DSLR green);
      4.55, 12.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.51, 11.9, 2' (David A. J. Seargent, Cowra, NSW, Australia, 25-cm reflector);
Oct. 31.81, 10.8, 2'.8 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     30.81, 10.8, 3' (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     30.78, 7.7, 10' (U. Pilz, Leipzig, Germany, 7x50 binoculars);
     30.43, 10.8, 6'.7 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     29.94, 11.0:, -- (A. Amorim, Florianopolis, Brazil, 0.18-m reflector);
     27.81, 10.7, 2' (M. L. Paradowski, Dabrowa, Poland, 0.30-m reflector);
     27.78, 11.0, 8' (T. Lehmann, Weimar, Germany, 2-cm telephoto lens + CCD via DSLR green);
     27.42, 10.6, 5'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     25.42, 10.4, 6'.3 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     24.79, 10.7, 9' (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     24.44, 10.9, 5' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     22.86, 12.9, 0'.53 (M. L. Paradowski, Lublin, Poland, 6.8-cm refractor + CCD + V filter; moonlight);
     22.40, 10.9, 6'.2 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     19.94, 11.0, -- (A. Amorim, Florianopolis, Brazil, 0.18-m reflector; moonlight and clouds);
     13.83, 11.0, 8' (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     12.43, 11.1, 1'.5 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     12.03, 11.0:, -- (A. Amorim, Florianopolis, Brazil, 0.18-m reflector; moonlight and clouds);
     11.45, 10.8, 2'.7 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      8.07, 11.4:, -- (A. Amorim, Florianopolis, Brazil, 0.18-m reflector);
      6.83, 11.2:, 2' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      5.08, [11:, -- (A. Amorim, Florianopolis, Brazil, 0.18-m reflector);
      4.96, 10.8, 1' (A. Amorim, Florianopolis, Brazil, 0.18-m reflector);
      2.86, 11.4, 7' (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
      1.99, 10.7, 1'.5 (A. Amorim, Florianopolis, Brazil, 0.18-m reflector);
Sep. 29.09, 12.0:, -- (A. Amorim, Florianopolis, Brazil, 0.18-m reflector);
     28.43, 11.8, 4' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     27.88, 11.4, 8' (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     26.85, 12.4, -- (U. Pilz, Leipzig, Germany, 32-cm reflector);
     26.47, 12.8, 1'.5 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector);
     25.51, 12.2, 3' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     24.47, 12.7, 2'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     13.00, 12.3, 1'.7 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      6.96, 13.9, 1'.6 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
Aug. 16.69, 15.7, 0'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
 
 
COMET 155P/Shoemaker
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Jan.  3.77, 15.7, 1'.6 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      1.78, 15.7, 1'.6 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
2019
Dec. 27.78, 15.2, 1'.3 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
Nov.  1.71, 14.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 13.80, 17.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 156P/Russell-LINEAR
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 16.83, 10.8, 3' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     13.81, 10.6, 5' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
      7.84, 10.8, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      5.98, 11.7, 3' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
      3.00, 11.0, 2' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
2020
Dec. 21.48, 11.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     21.14, 12.3, 1'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     20.18, 12.2, 1'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     19.22, 11.6, 4'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     18.77, 11.2, 0'.8 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     18.14, 11.9, 2'.3 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     16.86, 9.9, 5' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     15.25, 11.7, 3'.5 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     14.46, 10.5, 4'.2 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     11.10, 11.6, 4'.0 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      8.87, 9.7, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      5.16, 11.2, 6'.0 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      3.49, 10.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov. 21.52, 11.1, 2'.1 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     21.39, 10.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     17.94, 9.6, 8' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     15.46, 9.7, 6' (C. Wyatt, Walcha, NSW, Australia, 40-cm reflector);
     14.45, 9.7, 5'.6 (C. Wyatt, Walcha, NSW, Australia, 40-cm reflector);
     13.45, 10.4, 6'.5 (K. Yoshimoto, Yamaguchi, Japan, 180-mm-f.l. lens + digital camera);
     10.44, 10.3, 5'.2 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     10.40, 11.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      8.41, 10.6, 4'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      7.98, 10.8, 2' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
      6.96, 10.3, 3' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      3.41, 10.6, 4' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
Oct. 24.50, 11.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     17.94, 11.7, 2' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     16.00, 10.7, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     12.58, 12.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     11.57, 12.8, 3'.5 (K. Yoshimoto, Kumage, Yamaguchi, Japan, 0.20-m reflector + CCD);
     10.98, 11.8, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     10.42, 12.5, 4'.4 (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD);
 
 
COMET 157P/Tritton
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2017
May  20.53, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr. 19.66, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 158P/Kowal-LINEAR
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Apr. 21.64, 18.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2013
Dec. 29.52, 18.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 159P/LONEOS
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Jan.  3.78, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Dec.  9.58, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov.  4.78, 17.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 160P/LINEAR
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Feb.  3.09, 15.3, 25" (H. Sato, Tokyo, Japan, remotely with a 0.43-m astrograph + CCD near Mayhill, NM, USA);
Jan. 16.72, 13.8, 0'.5 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
2019
Nov.  9.42, 14.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.38, 14.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 162P/Siding Spring
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan.  5.05, 16.6, -- (H. Sato, Tokyo, Japan, remotely w/ 0.43-m astrograph + CCD at Mayhill, NM, USA; stellar appearance);
      2.36, 16.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2020
Dec. 26.48, 16.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     20.12, 16.4, 0'.5 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     19.72, 13.4, 0'.5 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     19.12, 16.8, 0'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      6.42, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      5.11, 15.4, 0'.3 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Nov. 14.43, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      5.45, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr. 18.81, 18.7, -- (H. Sato, Tokyo, Japan, remotely with a 0.51-m astrograph + CCD at Siding Spring, NSW; stellar appearance);
 
 
COMET 164P/Christensen
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Nov. 24.82, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 168P/Hergenrother
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2012
Dec.  5.74, 13.2, 0'.5 (U. Pilz, Leipzig, Germany, 32-cm reflector);
      2.80, 11.2, 3'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Nov. 24.39, 10.8, 2'.8 (S. Yoshida, Gunma, Japan, 0.40-m reflector; bright moonlight);
     14.88, 11.0, 2'.0 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     13.86, 11.0, 2'.2 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     13.74, 11.0, 2' (U. Pilz, Leipzig, Germany, 32-cm reflector);
     12.91, 10.5, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     12.87, 12.6, 1' (J. Karnfelt, Gothenburg, Sweden, 40-cm reflector);
      6.90, 10.3, 3'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      4.82, 10.3, 3'.5 (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
      3.88, 12.5, 0'.5 (J. Karnfelt, Gothenburg, Sweden, 40-cm reflector);
Oct. 23.69, 10.1, 2'.2 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector);
     21.67, 9.9, 2'.6, (M.-T. Hui, Luogang, Canton, China, 20.0-cm reflector; city lights and heavy haze);
     20.88, 9.8, 3'.0 (V. Ivanov, Melovoe, Russia, 25.4-cm reflector);
     20.81, 9.7, 2' (M. L. Paradowski, Dabrowa, Poland, 0.20-m reflector);
     19.82, 9.4, 5' (J. J. Gonzalez, Asturias, Spain, 25x100 binoculars);
     18.93, 9.5, 3'.5 (V. Ivanov, Melovoe, Russia, 25.4-cm reflector);
     18.49, 10.0, 1'.9 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector);
     18.41, 10.5, 2'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     17.90, 9.7, 2' (M. L. Paradowski, Lublin, Poland, 0.10-m reflector; city lights);
     16.94, 9.8, 1'.5 (A. Kammerer, St. Leon-Rot, Germany, 0.30-m reflector);
     15.42, 9.5, 2'.4 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     14.66, 9.7, 2' (K. Yoshimoto, Yamaguchi, Japan, 20x100 binoculars);
     14.65, 9.2, 3'.0 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + V filter + CCD);
     13.91, 10.4, 1'.4 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     13.52, 10.1, 2'.1 (Y. Nagai, Niigata, Japan, 0.32-m reflector);
     12.84, 9.8, 1'.7 (A. Kammerer, St. Leon-Rot, Germany, 0.30-m reflector);
     11.76, 9.5, 4'.3 (M.-T. Hui, Luogang, Canton, China, 20.0-cm reflector; city lights and haze; extremely close to a star of mag 10.7);
     11.10, 9.2, 6' (C. W. Hergenrother, Tucson, AZ, USA, 30x125 binoculars);
     10.88, 9.2, 2'.5 (J. Warell, Lindby, Skurup, Sweden, 11x80 binoculars)
     10.83, 10.0, 1' (G. Holmberg, Lund, Sweden, 20-cm reflector);
     10.42, 10.2, 2'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      9.58, 9.4, 3' (K. Yoshimoto, Yamaguchi, Japan, 20x100 binoculars);
      9.13, 9.6, 6' (C. W. Hergenrother, Tucson, AZ, USA, 30x125 binoculars);
      8.57, 9.2, 3' (K. Yoshimoto, Yamaguchi, Japan, 20x100 binoculars);
      8.19, 9.3, 3' (C. W. Hergenrother, Tucson, AZ, USA, 30x125 binoculars);
      7.86, 9.8, 2'.1 (J. J. Chambo, Valencia, Spain, 7-cm refractor);
      7.80, 9.4, 1' (J. Karnfelt, Gothenburg, Sweden, 40.5-cm reflector);
      7.46, 9.5, 2'.0 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector);
      6.88, 9.8, 0'.5 (G. Holmberg, Lund, Sweden, 20-cm reflector);
      6.81, 9.5, 3' (J. Warell, Lindby, Skurup, Sweden, 11x80 binoculars);
      6.77, 9.3, 2'.5 (T. Karhula, Virsbo, Sweden, 18x50 binoculars);
      5.85, 9.6, 5' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
      5.78, 9.5, 3' (T. Karhula, Virsbo, Sweden, 18x50 binoculars);
      4.69, 9.8, 2'.2 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector);
      4.10, 9.8, 1'.5 (C. W. Hergenrother, Tucson, AZ, USA, 30x125 binoculars);
      3.46, 9.8, 2' (M. Mattiazzo, Castlemaine, Victoria, Australia, 20-cm reflector);
Sep. 30.89, 10.4, 1'.33 (M. L. Paradowski, Lublin, Poland, 0.15-m reflector + CCD + V filter);
     26.54, 10.4, 2'.5 (Y. Nagai, Niigata, Japan, 300-mm camera lens + CCD);
     24.79, 10.4, 1'.0 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector);
     23.00, 11.2, 2'.8 (M. L. Paradowski, Dabrowa, Poland, 0.20-m reflector);
     18.97, 12.3, 1'.5 (V. Ivanov, Melovoe, Russia, 25.4-cm reflector);
     16.60, 11.8, 1'.8 (Y. Nagai, Niigata, Japan, 0.32-m reflector);
     15.95, 11.3, 1'.9 (M. L. Paradowski, Dabrowa, Poland, 0.20-m reflector);
     15.78, 12.9, 1'.4 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     14.62, 11.7, 1'.8 (Y. Nagai, Niigata, Japan, 300-mm camera lens + CCD);
     13.95, 10.9, 3'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     13.90, 11.7, 2' (U. Pilz, Leipzig, Germany, 32-cm reflector);
     11.63, 12.2, 2'.3 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
      9.54, 12.8, 1' (Michael Mattiazzo, Castlemaine, Victoria, Australia, 28-cm reflector);
      6.90, 11.2, 3'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Aug. 26.77, 14.9, 0'.8 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
 
 
COMET 169P/NEAT
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2014
Mar. 15.42, 15.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      8.40, 14.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb. 22.40, 13.2, 1'.5 (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 170P/Christensen
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2014
Sep. 27.69, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 171P/Spahr
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Jan.  3.67, 16.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Oct. 29.68, 18.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 173P/Mueller
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan.  9.52, 17.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2020
Dec. 20.38, 17.5, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Nov. 21.70, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Oct. 31.65, 17.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 174P/Echeclus = (60558) Echeclus
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2017
Dec. 24.71, 14.4, 0'.3 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     19.86, 13.2, 0'.8 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     19.43, 14.3, 0'.7 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector; totally diffuse);
     17.49, 14.0, 1'.1 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
     12.02, 13.0:, 0'.5 (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     11.37, 13.2, 0'.5 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      8.57, 14.1, -- (E. Guido, Castellammare di Stabia, Italy, 0.50-m astrograph + CCD, at Siding Spring);
      8.57, 14.0, 5".0 (J.-C. Merlin, Angers, France, 0.51-m astrograph + CCD + R filter at Siding Spring, NSW);
      8.42, 14.1, -- (J. Drummond, Gisborne, New Zealand, 0.35-m reflector + CCD; stellar appearance);
2016
Nov.  2.53, 17.4, 0'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
Sep.  9.67, 15.4, 0'.7 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
      7.03, 14.5, 0'.2 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      1.72, 15.0, 0'.3 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Aug. 30.09, 14.8, -- (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
2015
July 25.74, 17.5, -- (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
2014
Sep. 14.47, 17.6*, < 0'.1 (M. Tsumura, Wakayama, Japan, 35-cm reflector + CCD);
     13.50, 17.7*, < 0'.1 (M. Tsumura, Wakayama, Japan, 35-cm reflector + CCD);
2011
June  4.01, 14.3, 0'.4 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.95, 15.1, 1'.1 (J. Cerny, Korcula, Croatia, 0.35-m reflector);
 
 
COMET 178P/Hug-Bell
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Dec. 20.42, 17.3, 0'.5 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Oct. 18.78, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 18.81, 18.3, 8" (H. Sato, Tokyo, Japan; remotely using a 0.51-m astrograph + CCD at Siding Spring);
2014
Jan. 18.84, 18.0, 0'.5 (Sergey Shurpakov, Baran', Belarus, 0.20-m reflector + CCD);
     12.52, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2013
Dec. 26.93, 17.1, ! 0'.43 (Sergey E. Shurpakov, Baran, Belarus, 20-cm reflector + CCD);
Nov. 16.77, 17.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 180P/NEAT
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
May  14.61, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr.  7.78, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb. 18.73, 17.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 183P/Korlevic-Juric
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Apr.  8.65, 17.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 185P/Petriew
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Apr. 21.46, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      8.42, 16.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 31.47, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     17.41, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     14.76, 12.5, 0'.5 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     12.42, 12.5:, 1'.3 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector; bright sky);
     10.44, 13.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb. 24.39, 12.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     17.82, 10.4, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     12.41, 12.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      5.08, 12.4, 2'.58 (K. Yoshimoto, Yamaguchi, Japan, 0.43-m reflector + CCD, at Mayhill, NM, USA);
      3.39, 12.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 27.38, 12.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     21.37, 12.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     17.81, 10.7, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     13.38, 12.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      6.38, 13.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.37, 13.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Dec. 29.36, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     17.37, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      9.36, 16.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2012
Sep. 18.13, 12.0, 1'.2 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     15.79, 11.5, 2'.4 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     14.75, 11.0, 2' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     14.12, 11.5, 2' (U. Pilz, Leipzig, Germany, 32-cm reflector);
Aug. 26.88, 10.7, 3' (M.-T. Hui, Luogang, Canton, China, 20.0-cm reflector; city lights, twilight);
     24.79, 10.5, 2'.8 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     23.80, 10.2, 3' (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector);
     22.15, 9.7, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     19.80, 11.2, 3' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     19.77, 11.0, 2'.0 (Y. Nagai, Niigata, Japan, 0.32-m reflector);
     19.75, 10.1, 3'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     18.79, 10.8, 2'.2 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      5.75, 11.5, 1'.2 (Y. Nagai, Niigata, Japan, 300-mm camera lens + CCD);
July 30.77, 10.9, 2'.9 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector);
     21.35, 11.3, 1'.5 (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
     17.13, 11.0, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
 
 
COMET 188P/LINEAR-Mueller
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Jan.  3.59, 18.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Oct.  7.79, 18.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
Dec. 17.51, 17.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 15.48, 16.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 189P/NEAT
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2012
July 23.93, 14.4, 0'.28 (M. L. Paradowski, Lublin, Poland, 0.15-m reflector + CCD + V filter);
     13.01, 14.5, 0'.4 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      8.53, 15.0, 0'.3 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + unfiltered CCD);
 
 
COMET 191P/McNaught
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2015
Jan.  1.62, 17.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2014
Nov. 22.75, 17.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 24.69, 18.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 200PLarsen
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Sep. 23.26, 6" (H. Sato, Tokyo, Japan, remotely with 0.43-m astrograph + CCD);
 
 
COMET 201P/LONEOS
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2015
Feb. 11.45, 14.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  2.51, 15.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2014
Nov. 22.41, 15.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 14.59, 15.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     13.54, 15.6*, 0'.4 (M. Tsumura, Wakayama, Japan, 35-cm reflector + CCD);
 
 
COMET 203P/Korlevic
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Sep. 29.41, 18.5, 8" (H. Sato, Tokyo, Japan, remotely with 0.43-m astrograph + CCD);
2010
Mar. 21.44, 17.1*, 0'.3 (M. Tsumura, Wakayama, Japan, 35-cm reflector + CCD);
 
 
COMET 204P/LINEAR-NEAT
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2015
Dec. 18.74, 16.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 205P/Giacobini
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2015
Oct. 13.72, 16.2, 0'.5 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
      8.76, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      6.68, 15.6, 0'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
Sep. 21.75, 13.7, 0'.4 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Sep. 18.63, 14.8, 0'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD)
 
 
COMET 209P/LINEAR
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2014
June  2.16, 12.8, 0'.5 (A. Hale, Cloudcroft, NM, 0.41-m reflector);
      1.45, 12.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  31.46, 12.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     31.18, 12.9, 0'.5 (A. Hale, Cloudcroft, NM, 0.41-m reflector);
     31.04, 12.2, 0'.8 (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     30.92, 12.0:, -- (A. Amorim, Florianopolis, Brazil, 0.18-m reflector);
     29.96, 11.8, 1' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
     29.92, 12.0:, -- (A. Amorim, Florianopolis, Brazil, 0.18-m reflector);
     29.17, 12.8, 0'.7 (A. Hale, Cloudcroft, NM, 0.41-m reflector);
     29.03, 12.0:, -- (A. Amorim, Florianopolis, Brazil, 0.18-m reflector);
     27.19, 12.7, 0'.8 (A. Hale, Cloudcroft, NM, 0.41-m reflector);
     25.48, 13.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     24.92, 12.2, 2'.5 (T. Lehmann, Weimar, Germany, 6-cm telephoto lens + CCD via DSLR);
     23.52, 14.3, 0'.6 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + V filter + CCD);
     22.19, 13.3, 1' (A. Hale, Cloudcroft, NM, 0.41-m reflector);
     18.17, 14.1, 0'.3 (A. Hale, Cloudcroft, NM, 0.41-m reflector);
      3.54, [14.3, -- (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Apr. 26.54, 16.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 23.52, 17.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      5.57, 18.0, -- (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD; stellar appearance);
Feb.  8.47, 18.2, -- (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD; stellar in appearance);
      2.71, 18.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 22.76, 18.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2013
Dec. 30.59, 18.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 210P/Christensen
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
May  24.43, 13.8, 0'.6 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     17.35, 13.6, 0'.9 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector; alt. 16 deg);
     14.43, 13.2, 1'.1 (H. Sato, Tokyo, Japan, remotely from Mayhill, NM, USA, 0.43-m astrograph + CCD);
     10.35, 12.9, 1'.1 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      3.12, 12.5, 1'.1 (H. Sato, Tokyo, Japan, remotely from Mayhill, NM, USA, 0.43-m astrograph + CCD);
      2.43, 12.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr. 30.44, 12.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     25.45, 11.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     23.42, 11.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2014
Aug. 19.80, 11.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     18.79, 11.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      6.79, 12.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 29.79, 13.7, 0'.5 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
     28.78, 13.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     25.77, 13.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 213P/Van Ness
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Jan. 14.39, 17.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Nov. 19.45, 16.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 25.48, [12.7, ! 0'.5 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     10.40, 15.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.48, 14.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 12.46, 14.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 18.62, 14.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.58, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June 20.75, 15.0, 0'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.43-m reflector + CCD; remotely at Siding Spring);
      2.68, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
May  22.58, 16.6, 0'.2 (K. Yoshimoto, Yamaguchi, Japan, 0.50-m reflector + CCD; remotely at Siding Spring);
     20.71, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     18.74, 16.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.81, 17.7, 0'.2 (K. Yoshimoto, Yamaguchi, Japan, 0.50-m reflector + CCD at Siding Spring);
      1.79, 17.9, 0'.2 (K. Yoshimoto, Yamaguchi, Japan, 0.50-m reflector + CCD at Siding Spring);
2011
Nov. 24.55, [13.6, ! 1'.0 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     17.83, 11.0, 6' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
Oct. 20.95, 11.5, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     18.72, 15.1, 1' (V. Nevski, Vitebsk, Belarus, 0.30-m reflector + CCD);
     16.74, 12.2, 1' (U. Pilz, Leipzig, Germany, 32-cm reflector);
      2.82, 14.5, 1' (V. Nevski, Vitebsk, Belarus, 0.30-m reflector + CCD);
      1.07, 11.2, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Sep. 26.92, 12.3, 2' (M. L. Paradowski, Muczne, Poland, 0.20-m reflector);
     25.91, 12.3, 2' (M. L. Paradowski, Muczne, Poland, 0.20-m reflector);
     24.89, 11.0, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     23.82, 12.6, 1' (U. Pilz, Leipzig, Germany, 32-cm reflector);
     19.91, 11.0, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      7.07, 11.2, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      2.87, 12.6, 0'.5 (U. Pilz, Leipzig, Germany, 32-cm reflector);
      1.19, 11.8, 1'.5 (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
Aug. 31.95, 12.3, 1'.6 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     28.93, 13.4, 1'.2 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     28.91, 12.5, 1'.5 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     26.98, 11.2, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     25.95, 12.5, 1'.7 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     25.66, 12.3:, 2' (M.-T. Hui, Canton, China, 20.0-cm reflector; barely seen; city lights);
      9.76, 12.4:, 1'.1 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      8.09, 11.8, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      6.01, 11.4, 2'.4 (M. L. Paradowski, Dabrowa, Poland, 0.20-m reflector);
July 28.56, 13.5, 1' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     28.11, 12.0, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     10.33, 12.0, 2' (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
      5.07, 12.0, 1'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
June 26.76, 11.9, 3'.3 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     24.58, 13.2, 1' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      6.77, 12.9, 1'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      4.09, 12.2, 1'.2 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; alt. 16 deg);
      2.03, 14.8, 0'.8 (J. Cerny, Korcula, Croatia, 0.35-m reflector);
Apr.  7.77, 14.8, -- (H. Sato, Ota-ku, Tokyo, Japan; remotely using a 0.30-m reflector + CCD, near Officer, Australia);
 
 
COMET 215P/NEAT
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Oct. 18.59, 17.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 20.35, 17.9, 0'.2 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Aug. 28.72, 17.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 217P/2009 F3 (LINEAR)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Jan. 13.64, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Dec. 28.65, 15.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct.  9.81, 14.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 26.78, 13.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     25.74, [14.0, ! 0'.5 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Aug. 21.12, 12.2, 2' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     19.77, 12.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.08, 12.5, 0'.5 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
July 18.76, 12.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.77, 12.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June   1.83, 14.6, 0'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.43-m reflector + CCD; remotely at Siding Spring);
May  29.76, 14.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 218P/LINEAR
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2015
July 10.62, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr. 15.75, 15.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 219P/LINEAR
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
Dec. 17.38, 16.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June 26.59, 17.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 222P/LINEAR
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2014
July 25.75, 16.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 226P/Pigott-LINEAR-Kowalski
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
Nov.  4.80, 14.5, 0'.5 (S. Yoshida, Kita-karuizawa, Gunma, Japan, 0.40-m reflector);
Oct. 15.68, 14.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      5.75, 14.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep.  2.08, 14.9, 0'.4 (M. L. Paradowski, Dabrowa, Poland, 0.30-m reflector);
      1.79, 15.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.76, [13.7, ! 0'.5 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Aug. 20.76, 14.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug.  7.78, 16.6, 0'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
      7.76, 15.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 230P/LINEAR
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
Jan.  9.43, 13.9, 0'.6 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
2015
Dec. 31.55, 13.9, 0'.7 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + V filter + CCD);
     21.16, 13.0, 0'.6 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Nov. 20.70, [15.4, -- (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Oct. 17.80, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 231P/LINEAR-NEAT
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Mar. 24.56, 17.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.76, 19.7, 8" (H. Sato, Tokyo, Japan, remotely with 0.51-m astrograph + CCD at Siding Spring);
 
 
COMET 235P/LINEAR
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Feb. 23.69, 18.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 236P/LINEAR
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2017
Nov. 19.52, 17.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2011
Oct.  3.98, 17.1, 0'.2 (V. Nevski, Vitebsk, Belarus, 0.30-m reflector + CCD);
 
 
COMET 237P/LINEAR
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
Nov. 16.76, 9.8, 3' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     13.36, 13.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      5.38, 12.0, 0'.7 (S. Yoshida, Kita-karuizawa, Gunma, Japan, 0.40-m reflector; low alt., moonlight);
      4.38, [11.6, ! 0'.8 (S. Yoshida, Kita-karuizawa, Gunma, Japan, 0.40-m reflector; low alt., moonlight);
Oct. 26.78, 9.5, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     20.41, 12.4, 0'.6 (S. Yoshida, Kita-karuizawa, Gunma, Japan, 0.40-m reflector; low alt.);
     15.37, 13.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.81, 9.6, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Sep. 28.81, 9.7, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      5.85, 10.0, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Aug. 29.86, 10.7, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
July  3.46, 13.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.93, 13.1, 0'.6 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
June  5.49, 14.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 239P/LINEAR
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Jan.  1.75, 17.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Dec. 15.64, 18.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 240P/2010 P1 (NEAT)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Apr.  3.68, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb.  1.68, 14.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Dec. 28.65, 14.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Nov. 14.75, 16.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 10.41, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Feb. 24.41, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan.  1.43, 14.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Oct. 29.55, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 12.65, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.68, 14.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 29.74, 14.4, 1'.2 (K. Yoshimoto, Yamaguchi, Japan, 0.50-m reflector + CCD; remotely at Siding Spring);
2011
May  31.88, 14.7, 0'.9 (J. Cerny, Korcula, Croatia, 0.35-m reflector);
     30.87, 15.4, 0'.6 (J. Cerny, Korcula, Croatia, 0.35-m reflector);
 
 
COMET 243P/NEAT
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Jan.  1.53, 17.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Dec. 28.44, 16.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     25.57, 16.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     12.34, 15.4, -- (A. Heinze, Mauna Loa, HI, USA, 0.5-m Schmidt telescope + CCD + g+r filter);
     10.38, 18.8, -- (A. Heinze, Mauna Loa, HI, USA, 0.5-m Schmidt telescope + CCD + red filter);
      9.43, 17.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 244P/Scotti
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2012
Feb. 10.73, 17.5, 0'.2 (V. Nevski, Vitebsk, Belarus, 0.30-m reflector + CCD);
 
 
COMET 246P/2010 V2 (NEAT)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
July 16.48, 14.2, 1' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     12.46, 14.0, 1' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
June 25.81, 15.7, 0'.21 (T. Scarmato, Calabria, Italy, 25-cm reflector + CCD + R_c filter; twilight);
     24.51, 14.0, 0'.8 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     22.45, 14.0, 0'.8 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     21.47, 14.0, 0'.8 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     20.44, 14.0, 1' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     19.46, 14.2, 1' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     18.46, 14.2, 0'.8 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     15.44, 14.1, 0'.7 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     15.21, 15.4, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     14.45, 14.0, 1' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector)
     12.26, 15.0, 0'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      9.47, 13.8, 1' (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector)
      9.27, 15.2, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      8.27, 15.0, 0'.8 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
May  29.44, 14.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     24.47, 14.2, 0'.8 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     21.88, 13.5, 0'.4 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     21.31, 15.2, 0'.7 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     17.39, 14.6, 0'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     17.20, 15.4, 0'.48 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     16.33, 15.3, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     14.27, 15.2, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     14.52, 14.2, 0'.5 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     13.51, 14.3, 0'.6 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
     11.46, 14.5, 0'.5 (P. Camilleri, Katherine, NT, Australia, 0.40-m reflector);
Apr. 24.43, 15.0, 0'.4 (C. Wyatt, Walcha, NSW, Australia, 0.40-m reflector);
     22.43, 14.7, 0'.9 (C. Wyatt, Walcha, NSW, Australia, 0.40-m reflector);
     19.43, 14.8, 0'.6 (C. Wyatt, Walcha, NSW, Australia, 0.40-m reflector);
      4.59, 14.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 20.28, 15.0, 40" (H. Sato, Tokyo, Japan, 0.25-m astrograph + CCD near Mayhill, NM, USA);
Feb. 29.77, 15.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     23.62, 15.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2015
Jan.  3.46, 17.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2014
Dec. 23.42, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov. 15.56, 16.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 20.65, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug.  5.69, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2013
July  6.44, 13.2, 0'.6 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
May  19.74, 14.1, 0'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     17.76, 13.9, 0'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     14.78, 13.6, 0'.7 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
Jan. 20.26, 9.6, 3'.5 (J. J. Gonzalez, Zamora, Spain, 0.20-m reflector);
2012
June 14.01, 11.6, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
May  25.88, 12.4, 2'.4 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     24.90, 12.4, 2'.5 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     23.92, 12.4, 2'.5 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     19.96, 12.6, 2'.2 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     18.93, 12.6, 2'.3 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     17.95, 12.6, 2'.3 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     14.93, 11.8, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     13.93, 12.5, 1'.4 (M. L. Paradowski, Dabrowa, Poland, 0.20-m reflector);
     12.87, 14.0:, 0'.5 (V. Ivanov, Melovoe, Russia, 25.4-cm reflector);
Apr. 27.94, 12.8, 2'.0 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     24.90, 13.7, 0'.7 (V. Ivanov, Melovoe, Russia, 25.4-cm reflector);
     24.90, 14.2, 0'.7 (V. Nevski, Vitebsk, Belarus, 0.30-m reflector + CCD);
     22.86, 12.8, 1' (U. Pilz, Leipzig, Germany, 32-cm reflector);
Mar. 24.99, 13.0, 0'.6 (M. L. Paradowski, Lublin, Poland, 0.25-m reflector);
     15.00, 11.7, 3'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
 
 
COMET 249P/2011 A4 (LINEAR)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Aug. 19.46, 19.3, -- (H. Sato, Tokyo, Japan, remotely 0.43-m f/6.8 astrograph + CCD at Mayhill, NM; stellar appearance);
July 30.46, 18.7, -- (H. Sato, Tokyo, Japan, remotely 0.43-m f/6.8 astrograph + CCD at Mayhill, NM; stellar appearance);
May  16.20, 18.6, 0'.33 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     10.36, 18.3, -- (H. Sato, Tokyo, Japan, 0.51-m astrograph + CCD, Siding Spring, NSW; stellar);
2016
Jan.  9.39, [13.0, ! 0'.4 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
      1.39, 14.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2015
Dec. 28.71, [14.5, -- (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     26.37, 14.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     19.36, 13.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 250P/Larson
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Jan. 27.54, 18.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 252P/LINEAR
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
July  9.60, 18.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
June 26.65, 17.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     11.95, 11.9, 2'.5 (M. L. Paradowski, Dabrowa, Poland, 0.30-m reflector);
      3.56, [12.5, ! 1'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      2.62, 12.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      1.61, 12.8, 3'.5 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
      1.00, 10.0, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
May  27.94, 9.9, 10' (M. Lehky, Upice Observatory, Czech Republic, 20x100 binoculars);
     26.98, 9.8, 10' (M. Lehky, Upice Observatory, Czech Republic, 20x100 binoculars);
     22.66, 11.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     15.09, 8.2, 12' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
     14.69, 10.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     12.72, 9.3, 11' (K. Yoshimoto, Yamaguchi, Japan, 26x100 binoculars);
      8.00, 8.1, & 15' (A. Scholten, Eerbeek, Netherlands, 15x80 binoculars);
      5.88, 8.6, 4'.7 (W. Hasubick, Buchloe, Germany, 10-cm refractor);
      5.01, 7.9, & 15' (A. Scholten, Eerbeek, Netherlands, 15x80 binoculars);
      4.71, 7.9, 16' (S. Yoshida, Gunma, Japan, 10x70 refractor);
      2.34, 7.0, 20' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
      2.01, 7.3, & 16' (A. Scholten, Eerbeek, Netherlands, 15x80 binoculars);
      1.66, 7.9, 14' (S. Yoshida, Gunma, Japan, 10x70 refractor);
Apr. 30.76, 7.1, 18' (K. Yoshimoto, Yamaguchi, Japan, 8x42 binoculars);
     29.70, 6.8, 20' (K. Yoshimoto, Yamaguchi, Japan, 8x42 binoculars);
     28.74, 7.0, 20' (K. Yoshimoto, Yamaguchi, Japan, 180-mm f/2.8 lens + CCD);
     20.35, 6.7, 13' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
     19.34, 6.5, 10' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
     18.34, 6.5, 15' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
     18.21, 6.5, 22' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars; moonlight);
     17.32, 6.3, 10' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
     17.25, 6.4, 25' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     17.15, 6.4, 20' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
     16.21, 6.2, 25' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars; clouds);
     16.15, 6.3, 20' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
     15.74, 6.3, 30' (S. Yoshida, Ibaraki, Japan, 10x70 refractor);
     15.73, 8.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     15.34, 6.3, 12' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
     12.18, 6.0, 30' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     11.68, 6.4, 20' (Y. Nagai, Aichi, Japan, 7x35 binoculars);
     11.11, 7.0, 19'.6 (W. Hasubick, Buchloe, Germany, 9x63 binoculars);
     11.09, 6.1, & 18' (A. Scholten, Eerbeek, Netherlands, 8x40 binoculars);
     10.25, 6.0, 30' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     10.20, 5.9, 45' (W. Souza, Amparo, Brazil, 10x50 binoculars);
      9.23, 5.9, 30' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
      9.10, 6.0, & 20' (A. Scholten, Eerbeek, Netherlands, 8x40 binoculars);
      8.65, 6.3, 30' (S. Yoshida, Ibaraki, Japan, 10x70 refractor);
      8.21, 5.8, 35' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
      7.21, 5.7, 40' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
      7.18, 5.8, 30' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars);
      7.10, 6.0:, & 25' (A. Scholten, Eerbeek, Netherlands, 8x40 binoculars);
      7.05, 5.6, 35' (J. J. Gonzalez, Leon, Spain, 6x50 monocular; visible naked eye);
      6.33, 6.3, 18' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars);
      5.23, 5.9, 25' (W. Souza, Sao Paulo, Brazil, 0.1-m refractor);
      5.19, 5.7, 40' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
      5.06, 6.3, 20' (M. Lehky, Hradec Kralove, Czech Republic, 10x80 binoculars);
      4.21, 5.9, 30' (W. Souza, Sao Paulo, Brazil, 0.1-m refractor);
      4.06, 6.2, 20' (M. Lehky, Hradec Kralove, Czech Republic, 10x80 binoculars);
      3.21, 5.9, 30' (W. Souza, Sao Paulo, Brazil, 0.1-m refractor);
      3.06, 6.2, 20' (M. Lehky, Hradec Kralove, Czech Republic, 10x80 binoculars);
      2.23, 6.0, 25' (W. Souza, Sao Paulo, Brazil, 0.1-m refractor);
      2.18, 5.5, 50' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
      2.10, 6.0, 25' (M. Lehky, Hradec Kralove, Czech Republic, 10x80 binoculars);
      1.77, 5.5, 35' (K. Yoshimoto, Yamaguchi, Japan, 8x42 binoculars);
      1.33, 5.8, 15' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars; moonlight);
      1.11, 6.5:, & 18' (A. Scholten, Eerbeek, Netherlands, 15x80 binoculars; moonlight);
      1.07, 5.4, 45' (J. J. Gonzalez, Leon, Spain, 6x50 monocular; visible to naked eye);
Mar. 29.33, 5.7, 20' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars; moonlight);
     29.27, 5.8, 20' (W. Souza, Sao Paulo, Brazil, 15x70 binoculars; moonlight interference);
     28.32, 6.0, 18' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars; moonlight);
     28.17, 6.0, 30' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars; moonlight);
     23.23, 4.8, 50' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars; moonlight, clouds);
     21.33, 4.5, 90' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     20.23, 4.9, & 60' (W. Souza, Sao Paulo, Brazil, 0.1-m refractor);
     19.28, 5.0, 60' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars; mag about 4.7 via naked eye);
     18.22, 5.3, 45' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     18.06, 6.5:, -- (A. Amorim, Florianopolis, Brazil, 10x50 binoculars; moonlight);
     17.13, 5.9, 30' (W. Souza, Sao Paulo, Brazil, 0.1-m refractor);
     16.95, 6.5, 15' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars; moonlight);
     16.14, 6.1, 35' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     15.97, 7.5:, -- (A. Amorim, Florianopolis, Brazil, 10x50 binoculars; moonlight);
     15.44, 6.1, 40' (M. Mattiazzo, Swan Hill, Australia, 8x40 binoculars; moonlight);
     14.94, 7.4, 7' (A. Amorim, Florianopolis, Brazil, 10x50 binoculars; moonlight);
     14.44, 6.5, 35' (M. Mattiazzo, Swan Hill, Australia, 8x40 binoculars; moonlight);
     14.06, 6.6, 30' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     13.50, 7.0, 30' (M. Mattiazzo, Swan Hill, Australia, 8x40 binoculars);
     13.04, 7.8, 18' (M. Goiato, Aracatuba, Brazil, 7x50 binoculars);
     13.00, 8.5:, 5' (A. Amorim, Florianopolis, Brazil, 0.07-m refractor);
     12.02, 9.3, 3' (A. Amorim, Florianopolis, Brazil, 0.18-m reflector);
     11.46, 8.0, 25' (M. Mattiazzo, Swan Hill, Australia, 8x40 binoculars);
     11.02, 8.6, 12' (M. Goiato, Aracatuba, Brazil, 20x100 binoculars);
     10.46, 8.4, -- (M. Mattiazzo, Swan Hill, Australia, 8x40 binoculars);
      8.46, 9.5, 15' (M. Mattiazzo, Swan Hill, Australia, 25x100 binoculars);
      8.02, 10.5, 4' (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
      7.46, 9.8, 10' (M. Mattiazzo, Swan Hill, Australia, 25x100 binoculars);
      7.06, 10.8, 3' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      6.47, 11.3, 8' (David A. J. Seargent, Cowra, NSW, Australia, 25-cm reflector);
      5.84, 10.5, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Feb. 27.47, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     10.48, 16.2, 0'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
Jan. 24.51, 17.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 257P/2012 F4 (Catalina)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan.  1.44, 18.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2020
Dec.  5.12, 18.0, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Nov.  5.49, 17.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 23.22, 17.3, 0'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     20.21, 17.1, 0'.7 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     19.25, 17.3, 0'.5 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Aug. 19.54, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     10.25, 17.3, 0'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
      8.24, 16.8, 0'.4 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
2014
Jan.  1.52, 18.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2013
Oct. 27.49, 16.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 16.73, 17.8, 0'.3 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
 
 
COMET 260P/McNaught
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Dec.  3.74, 12.6, 0'.5 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      3.08, 11.8, 1'.2 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Nov.  5.75, 12.7, 0'.8 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      2.41, 12.4, 0'.8 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      1.57, 12.1, 1'.1 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Oct. 31.73, 12.5, 0'.9 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
     25.84, 10.7, 2' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      9.73, 12.6, 1'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      2.60, 12.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 29.04, 11.2, 2' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     25.50, 11.7, 1'.3 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     21.85, 12.0, 0'.9 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      9.71, 11.6, 1'.7 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      7.62, 12.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      7.25, 12.2, 1'.2 (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
      6.71, 12.9, 1'.2 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      6.70, 12.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      4.07, 11.6, 1'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.71, 13.0, 1'.1 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
Aug. 30.47, 13.3, 0'.8 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector + CCD; remotely from Mayhill, NM, USA);
     30.01, 11.4, 0'.6 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     28.11, 11.5, 1'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     26.61, 12.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     16.71, 12.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      5.72, 13.5, 1'.6 (K. Harikae, Chiba, Japan, 0.15-m reflector + CCD);
      5.11, 11.8, 1'.3 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      2.70, 13.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      2.07, 11.7, 1'.3 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
July 30.04, 11.6, 1'.3 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     25.69, 13.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2012
Nov. 24.77, 12.7, 1'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector; bright moonlight);
     13.77, 12.9, 1' (U. Pilz, Leipzig, Germany, 32-cm reflector);
     12.79, 12.0, 1' (J. Karnfelt, Gothenburg, Sweden, 40-cm reflector);
      6.91, 10.7, 3' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      4.84, 10.5, 4' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
Oct. 20.92, 12.3, 1' (M. L. Paradowski, Dabrowa, Poland, 0.20-m reflector);
     18.51, 12.4, 1'.0 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector);
     14.71, 12.6, 0'.8 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + V filter + CCD);
     13.92, 12.1, 0'.7 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      5.86, 10.6, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Sep. 24.82, 12.3, 1'.2 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector);
     24.69, 12.5, 1'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     23.03, 11.4, 2'.5 (M. L. Paradowski, Dabrowa, Poland, 0.20-m reflector);
     20.56, 12.3, 1'.6 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     15.97, 11.9, 1'.5 (M. L. Paradowski, Dabrowa, Poland, 0.20-m reflector);
     15.77, 12.4, 2'.4 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     14.99, 12.6, 1' (U. Pilz, Leipzig, Germany, 32-cm reflector);
     14.68, 12.8, 1'.7 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     13.97, 11.4, 2'.0 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     11.00, 13.2, 0'.81 (M. L. Paradowski, Lublin, Poland, 0.15-m reflector + CCD + V filter);
      9.57, 12.7, 0'.9 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      6.91, 11.0, 2'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Aug. 26.79, 13.6, 1'.2 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
     24.75, 13.2, 0'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     22.05, 12.6, 1'.1 (M. L. Paradowski, Dabrowa, Poland, 0.30-m reflector);
     22.02, 11.8, 1'.3 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     19.70, 13.0, 1'.6 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
 
 
COMET 261P/Larson
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Oct. 22.62, 16.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep.  6.76, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug.  7.72, 16.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 262P/2012 K7 (McNaught-Russell)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2013
Mar.  5.75, 13.1, 1'.1 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
      4.75, 13.0, 1'.2 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
Feb. 10.77, 11.5, 1' (U. Pilz, Leipzig, Germany, 32-cm reflector);
Jan. 13.82, 10.5, 9' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      8.43, 11.4, 4' (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector);
      6.44, 11.4, 4'.3 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      4.45, 11.2, 4'.3 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      3.83, 10.8, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      3.44, 10.6, 4'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
2012
Dec. 13.43, 10.8, 6'.1 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
     13.41, 10.6, 6' (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector);
      8.87, 10.7, 6' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      6.44, 11.0, 4' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      5.71, 13.1, 1' (U. Pilz, Leipzig, Germany, 32-cm reflector);
      5.43, 11.0, 4'.1 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      4.43, 11.3, 3' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
Nov. 24.37, [11.7, ! 1'.2 (S. Yoshida, Gunma, Japan, 0.40-m reflector; strong moonlight);
     12.83, 13.2, 1'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Oct. 20.85, [14.0, ! 0'.2 (M. L. Paradowski, Dabrowa, Poland, 0.20-m reflector);
 
 
COMET 266P/Christensen
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2014
Jan. 12.70, 18.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2013
Dec. 29.78, 18.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 269P/Jedicke
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2015
Jan.  1.72, 16.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2014
Nov. 13.74, 16.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 22.74, 17.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2013
Dec. 29.47, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 270P/Gehrels
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2014
Jan. 12.58, 18.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2013
Dec. 28.67, 18.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 273P/2012 V4 (Pons-Gambart)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2013
May  11.92, [14.0, !0'.5 (M. L. Paradowski, Dabrowa, Poland, 0.30-m reflector);
Apr.  7.76, 13.6, 1'.2 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
Mar. 16.76, 12.2, 2'.9 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
     16.04, 12.8, 2'.0 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
      9.01, 14.2, 0'.7 (S. Shurpakov, Baran', Belarus, 20-cm reflector + CCD);
      7.97, 14.3, 0'.6 (S. Shurpakov, Baran', Belarus, 20-cm reflector + CCD);
      6.96, 14.0, 0'.5 (S. Shurpakov, Baran', Belarus, 20-cm reflector + CCD);
      5.08, 12.8, 2' (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
Feb. 15.80, 10.8, 2'.1 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     11.17, 10.8, 2' (U. Pilz, Leipzig, Germany, 32-cm reflector);
      9.19, 9.6, 5' (J. J. Gonzalez, Zamora, Spain, 0.20-m reflector);
Jan. 22.87, 9.8, 3' (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector);
     20.27, 8.7, 6' (J. J. Gonzalez, Zamora, Spain, 0.20-m reflector);
2012
Dec.  8.77, 8.6, 5' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      6.43, 9.4, 2'.6 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      5.42, 9.3, 2' (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      4.95, 9.3, 3' (Jose G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      4.42, 9.3, 2'.5 (C. Wyatt, Walcha, NSW, Australia, 25-cm reflector);
      3.95, 9.5, 3' (Jose G. de S. Aguiar, Campinas, Brazil, 25x100 binoculars);
      3.43, 10.7, 1'.2 (R. H. McNaught, Siding Spring, NSW, 0.5-m Schmidt telescope + CCD);
      2.77, 9.1, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      2.46, 9.3, 3' (M. Mattiazzo, Castlemaine, Victoria, Australia, 20-cm reflector);
 
 
COMET 277P/LINEAR
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan.  8.51, 15.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2020
Dec. 20.20, 17.0, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
Oct. 25.48, 17.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 278P/McNaught
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Sep.  8.37, 17.4, 15" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD
 
 
COMET 284P/McNaught
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2014
Nov. 15.51, 15.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 25.48, 14.1, 0'.7 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     18.60, 14.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 22.65, 13.9, 0'.7 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     20.62, 14.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug.  2.68, 15.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 289P/Blanpain
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Jan. 31.80, [14.7, ! 0'.3 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     29.09, 18.3, -- (H. Sato, Tokyo, Japan, remotely with a 0.43-m astrograph + CCD near Mayhill, NM, USA; stellar appearance);
2019
Nov. 21.49, 18.9, 11" (K. Yoshimoto, Yamaguchi, Japan, remotely at Siding Spring, 0.50-m reflector + CCD);
     21.40, 18.8, 20" (T. Oribe, Saji, Japan, 1.03-m reflector + CCD);
     16.43, 20.9, -- (H. Sato, remotely at Siding Spring, 0.51-m astrograph + CCD; stellar);
 
 
COMET 290P/Jaeger
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2014
May   3.50, [13.1, ! 0'.7 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Apr. 26.50, 14.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     24.84, 13.0, 1'.0 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     17.83, 15.0, 0'.4 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
Mar. 27.90, 14.3, 0'.5 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     14.83, 14.8, 0'.3 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
      6.80, 14.3, 0'.6 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
Feb. 28.79, 12.8, 1'.3 (U. Pilz, Leipzig, Germany, 32-cm reflector);
     24.83, 12.8, 0'.6 (A. Kammerer, St. Leon-Rot, Germany, 0.30-m reflector);
     23.82, 12.5, 0'.8 (A. Kammerer, St. Leon-Rot, Germany, 0.30-m reflector);
     20.80, 13.6, 0'.8 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
      8.43, 13.1, 1'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
      4.87, 12.8:, & 0'.5 (A. Kammerer, St. Leon-Rot, Germany, 0.30-m reflector);
      4.78, 11.8, 3' (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
      3.86, 12.0, 3'.5 (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
Jan. 27.94, 12.7, 2' (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     25.85, 12.0, 3' (M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector);
     19.75, 14.0, 0'.9 (Sergey Shurpakov, Baran', Belarus, 0.20-m reflector + CCD);
     18.83, 12.9, 1'.5 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     18.78, 14.2, 1' (Sergey Shurpakov, Baran', Belarus, 0.20-m reflector + CCD);
     13.80, 14.6, 0'.3 (Sergey Shurpakov, Baran', Belarus, 0.20-m reflector + CCD);
      5.93, 12.5, 2'.1 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
      4.12, 11.8, 1'.5 (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
      1.88, 12.8, 1'.3 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
2013
Dec. 30.95, 12.1, 0'.5 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     30.78, 11.3, 1' (U. Pilz, Leipzig, Germany, 32-cm reflector);
     29.48, 13.1, 1'.3 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
     25.90, 13.0:, 0'.3 (J. Karnfelt, Gothenburg, Sweden, 0.40-m reflector);
     20.89, 12.7, 1'.7 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
      7.92, 13.4:, 0'.5 (J. Karnfelt, Gothenburg, Sweden, 0.40-m reflector);
      4.98, 12.7, 0'.8 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      2.13, 12.8, 1' (U. Pilz, Leipzig, Germany, 32-cm reflector);
Nov. 29.57, 14.0, 0'.9 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
     25.99, 13.6, 0'.8 (T. Lehmann, Weimar, Germany, 0.20-m reflector + CCD via DSLR green);
     23.72, 13.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 26.76, 14.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     13.77, 14.6, 0'.4 (S. Yoshida, Gunma, Japan, 0.40-m reflector; near limit);
     12.77, [14.5, ! 0'.4 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
     11.73, [13.8, ! 0'.5 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Aug. 16.78, 17.2, 0'.3 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
 
 
COMET 291P/2013 N2 (NEAT)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2014
Jan. 19.42, 17.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2013
Dec.  2.85, 17.2, ! 0'.38 (Sergey E. Shurpakov, Baran, Belarus, 20-cm reflector + CCD);
Nov. 24.47, 16.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 26.73, 16.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 292P/Li
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2013
Nov. 24.51, 16.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 26.62, 16.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 293P/2013 R2 (Spacewatch)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 18.61, 18.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2020
Dec. 18.65, 18.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2014
Jan. 12.63, 18.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2013
Nov. 30.78, 19.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 294P/2013 X2 (LINEAR)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2013
Dec. 29.82, 19.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 300P/2014 G2 (Catalina)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Jan.  1.42, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Dec.  8.40, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2014
May  17.77, 13.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      6.77, 14.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 303P/2014 L1 (NEAT)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2014
Oct. 19.52, 18.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug.  5.64, 17.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 304P/2014 L4 (Ory)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Nov.  5.72, 17.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Aug. 13.74, 15.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 21.45, 16.2, 30" (H. Sato, Tokyo, Japan, remotely 0.43-m f/6.8 astrograph + CCD at Mayhill, NM);
2014
Nov. 22.78, 18.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 18.72, 17.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 20.75, 17.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 305P/2014 N1 (Skiff)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2014
Nov. 22.44, 16.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 27.60, 17.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 307P/2014 O1 (LINEAR)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2014
Sep. 27.55, 18.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 311P/PANSTARRS
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan.  7.17, 20.9, -- (H. Sato, Tokyo, Japan, remotely w/ 0.43-m astrograph + CCD at Mayhill, NM, USA; stellar appearance);
 
 
COMET 312P/NEAT
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Nov.  8.53, 19.1, 10" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
Aug. 25.66, 19.4, 6" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD
 
 
COMET 315P/LONEOS
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2017
Apr. 23.84, 13.8, 0'.5 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     13.71, 15.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 28.04, 14.2, 0'.57 (M. L. Paradowski, Lublin, Poland, 0.15-m reflector + CCD + R_c filter);
     27.95, 14.8, 0'.57 (M. L. Paradowski, Lublin, Poland, 0.15-m reflector + CCD + V filter);
     22.56, 14.0, 0'.5 (S. Yoshida, Mt. Hanadate, Ibaraki, Japan, 0.40-m reflector);
     17.63, 14.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     17.22, 14.4, 1'.0 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector + CCD; remotely from Mayhill);
     15.83, 12.3, 1'.7 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; possible minor outburst);
      4.62, 15.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.75, [13.5, ! 0'.8 (S. Yoshida, Mt. Hanadate, Ibaraki, Japan, 0.40-m reflector);
Jan. 24.85, 14.0, 0'.3 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector; extremely hard to see);
     24.25, 13.7, 0'.3 (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
      1.76, 14.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2016
Dec. 16.73, 15.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Nov. 17.69, 15.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct.  5.77, 15.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 329P/2015 T1 (LINEAR-Catalina)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
Dec.  7.55, 15.1, 1'.0 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
 
 
COMET 332P/2015 Y2 (Ikeya-Murakami) [Component A]
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
Mar.  7.57, 18.6, -- (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD;
Feb. 10.57, 18.1, -- (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD;
      8.72, 17.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 332P/2015 Y2 (Ikeya-Murakami) [Component C]
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
Mar.  7.57, 18.2, 0'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD;
Feb. 10.57, 17.6, 0'.4 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD;
      8.72, 17.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 332P/2015 Y2 (Ikeya-Murakami) [Component D]
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
Feb. 10.57, 18.5, -- (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD;
 
 
COMET 333P/LINEAR = P/2007 VA85 (LINEAR)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
July  9.68, 17.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr.  6.80, 12.5, 0'.4 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
Mar. 22.42, 12.0, 1'.0 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector; strong moonlight);
     21.46, 13.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     10.95, 11.5, 1'.5 (M. Goiato, Aracatuba, Brazil, 22-cm reflector);
      7.47, 14.4, 1'.1 (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD);
      5.90, 11.3, 2'.0 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      1.53, 13.2, 2'.0 (K. Yoshimoto, Yamaguchi, Japan, 180-mm f/2.8 lens + CCD);
Feb. 27.50, 13.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     11.54, 15.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     10.50, 15.3, -- (K. Yoshimoto, Yamaguchi, Japan, 0.16-m reflector + CCD; stellar appearance);
 
 
COMET 338P/McNaught
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
Dec. 25.42, 18.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 27.59, 17.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 340P/2016 N2 (Boattini)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
July 30.62, 18.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 343P/NEAT-LONEOS
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
Dec. 25.45, 17.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 27.64, 17.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 344P/2016 Q1 (Read)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
Oct. 24.63, 18.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 346P/2016 R1 (Catalina)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
Oct. 27.70, 18.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 347P/PANSTARRS
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2016
Dec. 25.50, 19.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 350P/McNaught
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
June  3.41, 19.3, 8" (H. Sato, Tokyo, Japan, 0.51-m astrograph + CCD, remotely at Siding Spring, NSW);
 
 
COMET 352P/2017 L1 (McNaught)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2017
Oct. 29.58, 16.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 30.62, 15.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 355P/2017 M2 (LINEAR-NEAT)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Jan.  4.60, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2017
Nov. 24.44, [14.0, ! 0'.4 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Oct. 29.64, 15.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep.  3.69, 17.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 361P/Spacewatch
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Oct. 28.74, 17.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Jan. 27.41, 18.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 364P/2018 A2 = P/2013 CU129 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Oct.  6.56, 16.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.95, 11.0, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Sep. 19.03, 11.3, 3'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     10.12, 11.8, 2'.7 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
Aug. 26.79, 14.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     25.77, 13.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Apr. 19.49, 17.8, 0'.3 (K. Yoshimoto, Yamaguchi, Japan, 0.20-m reflector + CCD);
May  26.49, 15.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 365P/2017 U6 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Apr.  7.63, 16.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Mar. 11.63, 16.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      3.75, 16.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 368P/2018 L3 (NEAT)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Jan.  1.58, 17.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Nov.  3.67, 17.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Nov. 15.72, 16.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct.  1.73, 17.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 369P/2018 P1 (Hill)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Jan.  1.69, 16.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2018
Nov. 14.69, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 371P/2018 R1 (LINEAR-Skiff)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2018
Nov. 14.58, 18.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 373P/Rinner
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Jan.  4.45, 17.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2019
Dec.  8.64, 17.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 375P/Hill
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Jan. 27.62, 17.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 376P/LONEOS
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
July 23.60, 19.6, -- (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD; stellar appearance);
2019
May  25.49, 17.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 377P/Scotti
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Apr. 14.53, 19.0, -- (H. Sato, Tokyo, Japan, remotely with a 0.51-m astrograph + CCD at Siding Spring, NSW; stellar appearance);
 
 
COMET 378P/2019 E2 = P/2005 Y2 (McNaught)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Apr.  5.77, 19.5, 8" (H. Sato, Tokyo, Japan, remotely with a 0.51-m astrograph + CCD at Siding Spring, NSW);
2019
May  23.16, 20.4, -- (H. Sato, Tokyo, Japan, remotely with 0.43-m astrograph + CCD; stellar appearance);
 
 
COMET 384P/2019 O1 = P/2014 U2 (Kowalski)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Oct. 22.65, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 13.68, 17.5, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 387P/2019 R1 = P/2008 Y1 (Boattini)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Nov.  1.75, 17.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 11.77, 16.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 389P/2019 S1 = P/2006 R1 (Siding Spring)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2019
Sep. 27.36, 19.3, -- (H. Sato, Tokyo, Japan, remotely with 0.43-m astrograph + CCD; stellar appearance);
 
 
COMET 390P/2019 U1 = P/2006 W1 (Gibbs)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Dec. 18.74, 19.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 13.79, 17.8, 15" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
 
 
COMET 392P/2019 U3 = P/2004 WR9 (LINEAR)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Jan. 27.09, 20.4, -- (H. Sato, Tokyo, Japan, remotely with a 0.43-m astrograph + CCD near Mayhill, NM, USA; stellar appearance);
 
 
COMET 397P/2020 M2 = P/2012 SB6 (Lemmon)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Dec. 20.36, 18.1, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     16.52, 18.1, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 24.69, 17.8, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
July 27.45, 17.5, 12" (H. Sato, Tokyo, Japan, remotely 0.43-m f/6.8 astrograph + CCD at Mayhill, NM);
 
 
COMET 398P/2020 P2 (Boattini)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 16.82, 11.2, 4' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     13.80, 10.8, 4' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     10.00, 11.7, 1' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      7.85, 11.2, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
      5.99, 11.6, 2' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
      4.08, 11.7, 1' (M. Goiato, Aracatuba, Brazil, 0.22-m reflector);
      2.46, 12.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2020
Dec. 23.97, 11.8, 2' (J. G. de S. Aguiar, Campinas, Brazil, 0.27-m reflector);
     21.24, 13.1, 2'.0 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     20.30, 13.0, 2'.1 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     19.29, 13.0, 2'.0 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     18.83, 12.4, 0'.6 (W. Hasubick, Buchloe, Germany, 44-cm reflector);
     18.48, 12.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     16.85, 11.0, 4' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     14.51, 12.4, 1'.4 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
Nov. 21.60, 13.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     21.54, 13.5, 0'.5 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector);
     17.96, 13.2, 1'.5 (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     15.68, 13.9, 0'.7 (C. Wyatt, Walcha, NSW, Australia, 40-cm reflector);
     14.48, 13.9, 1' (C. Wyatt, Walcha, NSW, Australia, 40-cm reflector);
      8.56, 14.4, 55" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
Oct. 30.63, 13.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     18.70, 14.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Sep. 13.78, 16.7, 18" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
 
 
COMET 400P/2020 R1 = P/2013 PA104 (PANSTARRS)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 13.42, 18.2, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2020
Nov. 21.49, 17.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      8.54, 18.1, 15" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
 
 
COMET 402P/2020 Q3 = P/2002 T5 (LINEAR)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 13.48, 17.9, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2020
Nov. 21.57, 17.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      8.55, 18.2, 15" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
Aug. 25.64, 19.8, 8" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD
 
 
COMET 403P/2020 T1 = P/2007 VQ11 (Catalina)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan.  8.64, 18.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2020
Dec. 16.63, 18.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 405P/2020 U1 = P/2013 TL117 (Lemmon)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Dec. 20.44, 17.8, 0'.6 (C. S. Morris, Fillmore, CA, U.S.A., 41-cm reflector + CCD);
     12.72, 16.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
Oct. 30.71, 17.4, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 406P/2020 R8 = P/2007 R2 (GibBs)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2020
Oct. 10.63, 20.9, -- (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD; stellar appearance);
 
 
COMET 409P/2020 V1 = P/2005 XA54 (LONEOS-Hill)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan.  8.71, 16.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
2020
Dec. 12.75, 17.3, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
 
 
COMET 411P/2020 W3 = P/2007 B1 (Christensen)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 17.44, 19.6, 10" (H. Sato, Tokyo, Japan, remotely w/ 0.43-m astrograph + CCD at Mayhill, NM, USA);
 
 
COMET 413P/2020 W4 = P/2014 E1 (Larson)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 20.75, 19.0, 6" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
 
 
COMET 414P/2021 A3 = P/2016 J3 (STEREO)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 18.38, 13.0, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
     16.78, 9.7, 5' (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
     13.37, 13.7, -- (K. Kadota, Ageo, Japan, 0.25-m reflector + CCD);
      8.06, 14.7, 1'.0 (H. Sato, Tokyo, Japan, remotely with a 0.43-m astrograph + CCD at Mayhill, NM);
 
 
COMET 415P/2020 Y4 = P/2013 EW90 (TENAGRA)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 21.75, 18.7, 15" (H. Sato, Tokyo, Japan, remotely w/ 0.51-m astrograph + CCD at Siding Spring);
 
 
COMET 416P/2021 A8 = P/2013 A2 (Scotti)
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2021
Jan. 17.28, 19.4, 6" (H. Sato, Tokyo, Japan, remotely w/ 0.43-m astrograph + CCD at Mayhill, NM, USA);



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