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.)
- Contributors of observations for this Web page should read this first. (Contributors of web data are expected also to contribute complete information for ICQ archiving.)
- Further Helpful Hints
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 Indeed, it is not uncommon that photometric data listed below are actually withdrawn by observers (or the ICQ Editor) due to problems, and sometimes substantial changes are made to the magnitudes before publication in the ICQ.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, Araçatuba, 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, Araçatuba, 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, Araçatuba, 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, Araçatuba, Brazil, 7x50 binoculars; moonlight); 19.12, 4.1:, 50' (M. Goiato, Araçatuba, Brazil, 7x50 binoculars; moonlight); 18.12, 3.8:, 70' (M. Goiato, Araçatuba, 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, Araçatuba, 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);
