Recent Comet Brightness Estimates

2I/Borisov
Total-magnitude and coma-diameter estimates:
2020 Jan. 21.73, 16.2, 1.2' (T. Lehmann, SSO (remote), 0.51-m Newtonian reflector; 1.8' tail in p.a. 313)

29P/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates:
2020 Feb. 19.82, 11.3, 1.5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2020 Feb. 19.81, 13.3, 0.55' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2020 Feb. 18.74, 13.6, 0.5' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2020 Feb. 15.84, 12.3, 1.8' (K. Hills, 0.5-m Newtonian reflector)
2020 Feb. 13.81, 12.3, 0.94' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Feb. 12.79, 12.2, 0.94' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Feb. 11.84, 12.4, 1.4' (K. Hills, 0.5-m Newtonian reflector)
2020 Feb. 08.77, 13.3, 0.75' (N. James, 970, 0.28-m Schmidt-Cassegrain)
2020 Feb. 01.83, 14.0, 1.1' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 28.86, 14.3, 0.8' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 27.83, 13.2, 1.3' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 26.86, 12.9, 1.5' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 24.83, 13.5, 1' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 21.76, 13.7, 4.2' (S. Fritsche, Koeditz, 0.1-m refractor)

31P/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates:
2020 Feb. 03.13, 18.8, 0.2' (K. Hills, 0.5-m Newtonian reflector)

76P/West-Kohoutek-Ikemura
Total-magnitude and coma-diameter estimates:
2020 Feb. 15.99, 18.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 30.99, 17.7, 0.3' (K. Hills, 0.5-m Newtonian reflector)

78P/Gehrels
Total-magnitude and coma-diameter estimates:
2020 Feb. 15.98, 15.2, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2020 Feb. 15.87, 16.1, 0.7' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Jan. 28.99, 15.0, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 23.97, 14.8, 2.5' (S. Fritsche, Koeditz, 0.1-m refractor; 0.8' tail in p.a. 301)
2020 Jan. 21.07, 15.7, 1.3' (S. Fritsche, Koeditz, 0.1-m refractor; 1.6' tail in p.a. 298)

87P/Bus
Total-magnitude and coma-diameter estimates:
2020 Jan. 29.18, 18.8, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 22.18, 18.8, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 21.27, 19.1, 0.2' (K. Hills, 0.5-m Newtonian reflector)

88P/Howell
Total-magnitude and coma-diameter estimates:
2020 Feb. 01.13, 17.0, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 23.25, 16.5, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 22.16, 18.1, 0.7' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Jan. 21.20, 17.5, 0.7' (T. Lehmann, Weimar, 0.2-m Newtonian reflector)

101P/Chernykh
Total-magnitude and coma-diameter estimates:
2020 Jan. 24.84, 15.2, 0.7' (K. Hills, 0.5-m Newtonian reflector)

112P/Urata-Niijima
Total-magnitude and coma-diameter estimates:
2020 Feb. 14.12, 15.8, 0.3' (G. van Buitenen, Mayhill, New Mexico (H06), 0.51-m Ritchey-Chretien)
2020 Feb. 13.83, 15.3, 0.37' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)

114P/Wiseman-Skiff
Total-magnitude and coma-diameter estimates:
2020 Feb. 18.76, 15.5, 0.3' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2020 Feb. 11.90, 15.4, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 31.43, 14.0, 0.5' (S. Yoshida, 0.4-m Newtonian reflector)
2020 Jan. 23.88, 14.3, 3.9' (S. Fritsche, Koeditz, 0.1-m refractor; 0.07-deg tail in p.a. 61)
2020 Jan. 23.85, 14.8, 1.7' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.05-deg tail in p.a. 72)
2020 Jan. 22.93, 14.6, 0.9' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 21.81, 14.5, 0.9' (M. Paradowski, Piotrowice Wielkie, Poland, 0.067-m Maksutov-Cassegrain)
2020 Jan. 21.80, 14.1, 3.7' (S. Fritsche, Koeditz, 0.1-m refractor; 0.06-deg tail in p.a. 73)

117P/Helin-Roman-Alu
Total-magnitude and coma-diameter estimates:
2020 Feb. 16.05, 17.9, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 31.04, 18.2, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 22.07, 18.4, 0.3' (K. Hills, 0.5-m Newtonian reflector)

124P/Mrkos
Total-magnitude and coma-diameter estimates:
2020 Feb. 16.06, 15.9, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2020 Feb. 03.95, 17.8, -- (A. Novichonok, ISON-Kitab observatory, 0.36-m Ritchey-Chretien)
2020 Feb. 02.07, 16.2, 0.37' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Jan. 31.11, 16.5, 0.37' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Jan. 31.00, 17.4, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 28.84, 17.9, -- (A. Novichonok, ISON-Kitab observatory, 0.36-m Ritchey-Chretien)
2020 Jan. 22.08, 17.4, 0.5' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Jan. 21.11, 18.0, 0.6' (S. Fritsche, Koeditz, 0.1-m refractor)

135P/Shoemaker-Levy
Total-magnitude and coma-diameter estimates:
2020 Jan. 28.97, 18.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)

155P/Shoemaker
Total-magnitude and coma-diameter estimates:
2020 Feb. 16.07, 15.0, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2020 Feb. 05.01, 15.6, 0.37' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Feb. 03.02, 14.8, 0.6' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 31.06, 14.8, 0.56' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Jan. 25.10, 15.6, 0.6' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 24.08, 15.0, 2.6' (S. Fritsche, Koeditz, 0.1-m refractor; 0.08-deg tail in p.a. 285)
2020 Jan. 22.03, 15.6, 1.7' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.09-deg tail in p.a. 289)
2020 Jan. 21.15, 14.8, 3' (S. Fritsche, Koeditz, 0.1-m refractor; 0.05-deg tail in p.a. 287)

159P/LONEOS
Total-magnitude and coma-diameter estimates:
2020 Feb. 16.02, 18.3, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2020 Feb. 02.06, 17.3, 0.37' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Feb. 01.05, 17.8, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 22.05, 18.1, 0.3' (K. Hills, 0.5-m Newtonian reflector)

173P/Mueller
Total-magnitude and coma-diameter estimates:
2020 Feb. 10.90, 18.1, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 23.91, 17.8, 0.2' (K. Hills, 0.5-m Newtonian reflector)

174P/Echeclus
Total-magnitude and coma-diameter estimates:
2020 Feb. 15.85, 19.3, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2020 Feb. 11.85, 19.2, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 31.02, 19.2, 0.2' (K. Hills, 0.5-m Newtonian reflector)

203P/Korlevic
Total-magnitude and coma-diameter estimates:
2020 Feb. 11.93, 18.2, 0.2' (K. Hills, 0.5-m Newtonian reflector)

228P/LINEAR
Total-magnitude and coma-diameter estimates:
2020 Feb. 16.01, 18.4, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 30.98, 18.1, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 22.02, 18.7, 0.2' (K. Hills, 0.5-m Newtonian reflector)

246P/NEAT
Total-magnitude and coma-diameter estimates:
2020 Feb. 05.05, 15.3, 0.3' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Feb. 01.15, 16.1, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 31.07, 15.4, 0.37' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Jan. 22.28, 16.3, 0.3' (K. Hills, 0.5-m Newtonian reflector)

260P/McNaught
Total-magnitude and coma-diameter estimates:
2020 Feb. 11.91, 16.3, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 28.94, 14.6, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 23.92, 15.6, 1.4' (S. Fritsche, Koeditz, 0.1-m refractor; 1.3' tail in p.a. 234)
2020 Jan. 21.88, 15.0, 3.3' (H. Kiiskinen, 0.4-m Ritchey-Chretien)
2020 Jan. 21.84, 15.2, 1.9' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 1.6' tail in p.a. 203)

266P/Christensen
Total-magnitude and coma-diameter estimates:
2020 Feb. 15.89, 18.1, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 23.89, 18.0, 0.3' (K. Hills, 0.5-m Newtonian reflector)

289P/Blanpain
Total-magnitude and coma-diameter estimates:
2020 Feb. 12.95, 18.4, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 31.80, [14.7, 0.3' (S. Yoshida, 0.4-m Newtonian reflector)
2020 Jan. 27.94, 17.0, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 23.93, 17.6, 0.9' (T. Lehmann, Weimar, 0.2-m Newtonian reflector)
2020 Jan. 21.92, 17.6, 0.6' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Jan. 21.90, 17.4, 0.9' (T. Lehmann, Weimar, 0.2-m Newtonian reflector)

C/2010 U3 (Boattini)
Total-magnitude and coma-diameter estimates:
2020 Feb. 03.16, 16.9, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2020 Feb. 02.01, 16.9, 0.37' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Jan. 24.04, 16.8, 1.3' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Jan. 22.19, 16.5, 0.6' (K. Hills, 0.5-m Newtonian reflector)

C/2011 KP36 (Spacewatch)
Total-magnitude and coma-diameter estimates:
2020 Feb. 11.88, 18.8, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2015 O1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2020 Jan. 30.95, 16.4, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 23.97, 16.1, 0.6' (K. Hills, 0.5-m Newtonian reflector)

C/2016 M1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2020 Feb. 11.87, 14.5, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 28.93, 14.8, 0.9' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 21.98, 14.4, 0.8' (K. Hills, 0.5-m Newtonian reflector)

C/2017 K2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2020 Feb. 07.10, 15.5, 0.37' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Feb. 02.26, 14.8, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2020 Feb. 02.15, 15.7, 0.37' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Jan. 29.04, 16.3, 0.5' (A. Novichonok, ISON-Kitab observatory, 0.36-m Ritchey-Chretien; 20.0" tail in p.a. 328)
2020 Jan. 24.19, 16.5, 1.1' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Jan. 22.20, 16.2, 1' (T. Lehmann, Weimar, 0.2-m Newtonian reflector)

C/2017 T2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2020 Feb. 19.95, 9.2, 4' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2020 Feb. 19.88, 8.9, 2.5' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector; 4.5' tail in p.a. 110)
2020 Feb. 19.78, 9.4, 2.5' (M. Meyer, 0.254-m Newtonian reflector; 0.1-deg tail in p.a. 105)
2020 Feb. 19.77, 9.5, 3' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 0.25-m Newtonian reflector; 3.0' tail in p.a. 110)
2020 Feb. 19.11, 9.2, 3' (C. Hergenrother, 30x125 binoculars)
2020 Feb. 18.83, 9.4, 6.8' (D. Swan, Tynemouth, UK, 0.2-m Schmidt-Cassegrain)
2020 Feb. 18.74, 8.9, 5' (P. Guzik, 10x50 binoculars)
2020 Feb. 17.77, 9.2, 3' (M. Meyer, 0.254-m Newtonian reflector)
2020 Feb. 15.94, 8.6, 11.65' (D. Buczynski, Tarbatness I81, 0.16-m reflector)
2020 Feb. 15.93, 9.6, 5.26' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Feb. 15.90, 9.5, 2' (M. Kwinta, Krakow, 0.19-m Newtonian reflector)
2020 Feb. 15.84, 8.9, 19' (S. Fritsche, Koeditz, 0.1-m refractor; 0.16-deg tail in p.a. 134)
2020 Feb. 15.74, 9.0, 4' (P. Guzik, 25x100 binoculars)
2020 Feb. 14.83, 9.0, 3' (C. Labordena, La Serra, 0.2-m Schmidt-Cassegrain)
2020 Feb. 13.85, 8.7, 11.28' (D. Buczynski, Tarbatness I81, 0.16-m reflector)
2020 Feb. 13.78, 9.4, 1.8' (M. Kwinta, Krakow, 0.19-m Newtonian reflector)
2020 Feb. 13.10, 9.1, 3' (C. Hergenrother, 30x125 binoculars)
2020 Feb. 12.86, 9.5, 3' (A. Scholten, Eerbeek, 0.2-m Newtonian reflector)
2020 Feb. 12.82, 9.3, 1.9' (M. Kwinta, Krakow, 0.19-m Newtonian reflector)
2020 Feb. 12.81, 10.2, 1' (U. Pilz, 0.32-m Newtonian reflector)
2020 Feb. 12.78, 9.1, 3.5' (C. Harder, Jeersdorf, Germany f, 0.3-m Newtonian reflector; 7.5' tail in p.a. 128)
2020 Feb. 12.77, 9.2, 3.5' (M. Meyer, 0.254-m Newtonian reflector; 0.06-deg tail in p.a. 120)
2020 Feb. 12.76, 8.9, 5' (P. Guzik, 10x50 binoculars)
2020 Feb. 11.81, 9.6, 2.2' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain; 3.7' tail in p.a. 115)
2020 Feb. 11.74, 9.3, 1.9' (M. Kwinta, Krakow, 0.19-m Newtonian reflector)
2020 Feb. 06.94, 9.2, 2.25' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Feb. 06.86, 10.7, 4.3' (J. Warell, 0.25-m Schmidt-Cassegrain; 6.7' tail in p.a. 129)
2020 Feb. 05.87, 9.0, 3.57' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Feb. 05.82, 9.1, 9' (S. Fritsche, Koeditz, 0.1-m refractor; 0.13-deg tail in p.a. 131)
2020 Feb. 05.76, 9.0, 16' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.18-deg tail in p.a. 131)
2020 Feb. 05.20, 9.4, 2.8' (C. Harder, Jeersdorf, Germany f, 0.3-m Newtonian reflector; 3.5' tail in p.a. 130)
2020 Feb. 05.19, 9.7, 3' (A. Scholten, Eerbeek, 0.2-m Newtonian reflector)
2020 Feb. 04.90, 9.1, 2.82' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Feb. 03.92, 9.4, 16.7' (H. Kiiskinen, 0.4-m Ritchey-Chretien; 10.5' tail in p.a. 138)
2020 Feb. 03.88, 9.2, 7.71' (N. James, 970, 0.09-m refractor)
2020 Feb. 03.14, 8.9, 4' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2020 Feb. 01.91, 8.9, 3.94' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Feb. 01.88, 9.9, 2.2' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2020 Feb. 01.75, 10.5, 0.9' (S. Szabo, Agfalva, 0.6-m Newtonian reflector; 5.0' tail in p.a. 125)
2020 Feb. 01.08, 9.0, 21' (T. Lehmann, Mayhill (remote), 0.106-m refractor; 0.27-deg tail in p.a. 136)
2020 Jan. 31.85, 9.2, 3' (C. Labordena, La Serra, 0.235-m Schmidt-Cassegrain; 4.0-deg tail)
2020 Jan. 31.77, 9.2, 13' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.17-deg tail in p.a. 133)
2020 Jan. 31.41, 9.0, 5.5' (S. Yoshida, 0.4-m Newtonian reflector)
2020 Jan. 31.00, 9.0, 3.57' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Jan. 30.89, 9.4, 2' (M. Kwinta, Krakow, 0.19-m Newtonian reflector)
2020 Jan. 29.83, 9.2, 3.8' (C. Harder, Jeersdorf, Germany h, 0.195-m Newtonian reflector; 6.5' tail in p.a. 125)
2020 Jan. 29.78, 9.4, 2.5' (M. Meyer, 0.254-m Newtonian reflector; 0.04-deg tail in p.a. 130)
2020 Jan. 28.85, 9.7, 2.7' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain; 4.6' tail in p.a. 145)
2020 Jan. 28.82, 9.4, 7.33' (N. James, 970, 0.09-m refractor)
2020 Jan. 28.78, 9.5, 3' (M. Meyer, 0.254-m Newtonian reflector)
2020 Jan. 27.96, 9.3, 9' (D. Buczynski, Tarbatness I81, 0.16-m reflector)
2020 Jan. 27.81, 9.3, 2.4' (T. Sciezor, 25x100 binoculars)
2020 Jan. 27.81, 9.5, 2.3' (M. Kwinta, Krakow, 0.19-m Newtonian reflector)
2020 Jan. 27.73, 9.1, 5' (P. Guzik, 10x50 binoculars)
2020 Jan. 26.90, 9.4, 2.6' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain; 4.5' tail in p.a. 130)
2020 Jan. 26.85, 9.2, 3.5' (C. Harder, Jeersdorf, Germany f, 0.3-m Newtonian reflector; 6.0' tail in p.a. 130)
2020 Jan. 26.85, 9.2, 5' (G. Scheerle, 0.235-m Schmidt-Cassegrain; 0.3-deg tail in p.a. 140)
2020 Jan. 26.85, 9.1, 3.5' (C. Labordena, La Serra, 0.2-m Schmidt-Cassegrain; 4.0-deg tail)
2020 Jan. 26.83, 9.3, 3' (V. Díaz, La Romana, Alicante, España, 0.127-m Newtonian reflector; 1.5' tail in p.a. 120)
2020 Jan. 26.82, 9.2, 4' (G. Scheerle, 9x63 binoculars)
2020 Jan. 26.82, 9.5, 6.8' (D. Buczynski, Tarbatness I81, 0.16-m reflector)
2020 Jan. 25.83, 9.3, 2' (T. Sciezor, 25x100 binoculars)
2020 Jan. 25.83, 10.0, 1.8' (M. Filipek, 0.25-m Newtonian reflector)
2020 Jan. 25.75, 9.6, 2.4' (M. Kwinta, Kraków, 0.19-m Newtonian reflector)
2020 Jan. 25.75, 9.1, 10' (H. Kiiskinen, 0.4-m Ritchey-Chretien; 6.4' tail in p.a. 142)
2020 Jan. 24.95, 9.0, 5' (P. Guzik, 10x50 binoculars)
2020 Jan. 24.85, 9.2, 12' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.15-deg tail in p.a. 138)
2020 Jan. 24.84, 9.7, 3.2' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 24.77, 9.4, 3.8' (M. Kwinta, Krzeslawice near Dobczyce, 0.5-m Newtonian reflector; 2.0' tail in p.a. 140)
2020 Jan. 24.76, 9.6, 2.9' (M. Kwinta, Krzeslawice near Dobczyce, 0.5-m Newtonian reflector; 5.0' tail in p.a. 140)
2020 Jan. 24.68, 9.8, 2.3' (A. Novichonok, innoe, -2C, 0.2-m Newtonian reflector; 4.0' tail in p.a. 150)
2020 Jan. 24.09, [ 9.4, -- (S. Aguirre, Hermosillo, Sonora,Mex. , 0.15-m Schmidt-Cassegrain)
2020 Jan. 23.98, 9.5, 3' (C. Harder, Jeersdorf, Germany h, 0.195-m Newtonian reflector; 4.5' tail in p.a. 120)
2020 Jan. 23.86, 9.7, 1.8' (M. Filipek, 0.25-m Newtonian reflector)
2020 Jan. 23.83, 9.2, 19' (S. Fritsche, Koeditz, 0.1-m refractor; 0.23-deg tail in p.a. 147)
2020 Jan. 23.80, 9.5, 2.5' (M. Kwinta, Kraków, 0.19-m Newtonian reflector)
2020 Jan. 23.79, 9.3, 2' (T. Sciezor, 25x100 binoculars)
2020 Jan. 23.78, 9.3, 13' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.2-deg tail in p.a. 142)
2020 Jan. 23.77, 9.5, 3' (M. Meyer, 0.254-m Newtonian reflector)
2020 Jan. 22.94, 10.0, 5.2' (D. Buczynski, Tarbatness I81, 0.16-m reflector)
2020 Jan. 21.92, 9.9, 1.5' (M. Filipek, 0.25-m Newtonian reflector)
2020 Jan. 21.92, 8.9, 2' (T. Karhula, Virsbo, Sweden, 0.305-m Newtonian reflector; 7.0' tail in p.a. 130)
2020 Jan. 21.87, 9.5, 8.3' (H. Kiiskinen, 0.4-m Ritchey-Chretien; 6.9' tail in p.a. 146)
2020 Jan. 21.87, 9.5, 2' (M. Paradowski, Piotrowice Wielkie, Poland, 15x70 binoculars)
2020 Jan. 21.85, 9.4, 17' (S. Fritsche, Koeditz, 0.1-m refractor; 0.19-deg tail in p.a. 148)
2020 Jan. 21.85, 9.6, 6' (M. Paradowski, Piotrowice Wielkie, Poland, 0.067-m Maksutov-Cassegrain; 0.06-deg tail in p.a. 135)
2020 Jan. 21.82, 9.3, 4.2' (M. Kwinta, Glanów, 0.33-m Newtonian reflector; 3.0' tail in p.a. 145)
2020 Jan. 21.81, 9.5, 3.2' (M. Kwinta, Glanów, 0.33-m Newtonian reflector; 6.0' tail in p.a. 145)
2020 Jan. 21.80, 9.2, 15' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.31-deg tail in p.a. 147)
2020 Jan. 21.77, 9.5, 4' (M. Meyer, 0.254-m Newtonian reflector)
2020 Jan. 21.73, 9.7, 2.5' (M. Kwinta, Krakow, 0.19-m Newtonian reflector)

C/2018 N2 (ASASSN)
Total-magnitude and coma-diameter estimates:
2020 Feb. 19.83, 12.6, 1' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2020 Feb. 15.78, 12.7, 3.9' (S. Fritsche, Koeditz, 0.1-m refractor; 0.06-deg tail in p.a. 143)
2020 Feb. 06.90, 13.7, 0.37' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Feb. 06.87, 13.6, 1.1' (J. Warell, 0.25-m Schmidt-Cassegrain; 0.5' tail in p.a. 126)
2020 Feb. 05.80, 13.0, 3' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.12-deg tail in p.a. 139)
2020 Feb. 05.79, 12.9, 2.8' (S. Fritsche, Koeditz, 0.1-m refractor; 0.06-deg tail in p.a. 139)
2020 Feb. 01.94, 11.7, 1.7' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Feb. 01.73, 13.7, 0.9' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2020 Jan. 31.80, 12.9, 2.4' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.12-deg tail in p.a. 138)
2020 Jan. 31.48, 12.5, 0.7' (S. Yoshida, 0.4-m Newtonian reflector)
2020 Jan. 29.79, 12.4, 0.9' (M. Meyer, 0.254-m Newtonian reflector)
2020 Jan. 26.86, 12.2, 0.8' (C. Harder, Jeersdorf, Germany f, 0.3-m Newtonian reflector)
2020 Jan. 25.76, 12.7, 6.7' (H. Kiiskinen, 0.4-m Ritchey-Chretien; 4.2' tail in p.a. 141)
2020 Jan. 24.82, 13.0, 2.1' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.05-deg tail in p.a. 132)
2020 Jan. 23.78, 12.6, 6' (S. Fritsche, Koeditz, 0.1-m refractor; 0.13-deg tail in p.a. 139)
2020 Jan. 22.86, 12.8, 3.3' (H. Kiiskinen, 0.4-m Ritchey-Chretien; 5.7' tail in p.a. 138)
2020 Jan. 21.91, 12.6, 1' (T. Karhula, Virsbo, Sweden, 0.305-m Newtonian reflector)
2020 Jan. 21.78, 12.5, 1.1' (M. Meyer, 0.254-m Newtonian reflector)
2020 Jan. 21.76, 12.8, 3' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.1-deg tail in p.a. 134)

C/2019 C1
Total-magnitude and coma-diameter estimates:
2020 Jan. 31.85, 17.3, -- (A. Novichonok, ISON-Kitab observatory, 0.36-m Ritchey-Chretien; 15.0" tail in p.a. 296)

C/2019 F1 (ATLAS-Africano)
Total-magnitude and coma-diameter estimates:
2020 Feb. 01.20, 16.6, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 25.27, 16.9, 0.3' (K. Hills, 0.5-m Newtonian reflector)

C/2019 K8 (ATLAS)
Total-magnitude and coma-diameter estimates:
2020 Jan. 30.93, 18.9, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2019 L3 (ATLAS)
Total-magnitude and coma-diameter estimates:
2020 Jan. 24.75, 17.4, 0.5' (T. Lehmann, Weimar, 0.2-m Newtonian reflector)

C/2019 N1 (ATLAS)
Total-magnitude and coma-diameter estimates:
2020 Feb. 16.21, 15.8, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2020 Feb. 01.99, 15.2, 0.37' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Jan. 24.21, 16.4, 0.8' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.6' tail in p.a. 26)
2020 Jan. 21.19, 16.4, 1.2' (S. Fritsche, Koeditz, 0.1-m refractor; 0.4' tail in p.a. 58)

C/2019 T4 (ATLAS)
Total-magnitude and coma-diameter estimates:
2020 Jan. 30.89, 17.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 23.92, 17.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2019 Y1 (ATLAS)
Total-magnitude and coma-diameter estimates:
2020 Feb. 20.73, 9.5, 4' (P. Guzik, 25x100 binoculars)
2020 Feb. 19.81, 9.6, 4' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2020 Feb. 19.77, 10.0, 3.5' (M. Meyer, 0.254-m Newtonian reflector)
2020 Feb. 18.73, 9.5, 4' (P. Guzik, 25x100 binoculars)
2020 Feb. 16.85, 12.0, 1.9' (M. Masek, 0.25-m Schmidt-Cassegrain; 1.8' tail in p.a. 68)
2020 Feb. 16.85, 10.8, 3.5' (M. Masek, 0.25-m Schmidt-Cassegrain)
2020 Feb. 15.75, 10.9, 6.4' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Feb. 15.73, 9.4, 4' (P. Guzik, 25x100 binoculars)
2020 Feb. 14.79, 10.8, 1.5' (C. Labordena, La Serra, 0.2-m Schmidt-Cassegrain)
2020 Feb. 13.73, 11.1, 1' (T. Karhula, Virsbo, Sweden, 0.305-m Newtonian reflector)
2020 Feb. 12.77, 9.6, 2.2' (C. Harder, Jeersdorf, Germany f, 0.3-m Newtonian reflector)
2020 Feb. 12.75, 10.0, 4' (P. Guzik, 25x100 binoculars)
2020 Feb. 11.73, 10.2, 4' (P. Guzik, 25x100 binoculars)
2020 Feb. 09.70, 10.9, 2.9' (A. Novichonok, With Nikon D5200 (134-mm lens), 0.028-m refractor)
2020 Feb. 07.72, [10.0, 4' (P. Guzik, 25x100 binoculars)
2020 Feb. 05.75, 11.3, 3.1' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Feb. 01.72, 13.2, 0.9' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2020 Jan. 31.78, 11.7, 2' (C. Labordena, La Serra, 0.235-m Schmidt-Cassegrain)
2020 Jan. 31.40, 11.4, 1.4' (S. Yoshida, 0.4-m Newtonian reflector)
2020 Jan. 27.71, 11.5, 3' (P. Guzik, 0.326-m Newtonian reflector)
2020 Jan. 23.73, 12.1, 4.2' (T. Lehmann, Weimar, 0.2-m Newtonian reflector)
2020 Jan. 23.73, 11.8, 7.5' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Jan. 21.73, 12.2, 5.1' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Jan. 21.72, 12.5, 2.9' (T. Lehmann, Weimar, 0.2-m Newtonian reflector)
2020 Jan. 21.71, [11.5, 2' (P. Guzik, 0.326-m Newtonian reflector)

C/2019 Y4 (ATLAS)
Total-magnitude and coma-diameter estimates:
2020 Feb. 19.94, 11.7, 3' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2020 Feb. 19.84, 13.5, 1.4' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2020 Feb. 18.93, 14.4, 0.7' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2020 Feb. 18.88, 14.7, 0.9' (D. Swan, Tynemouth, UK, 0.2-m Schmidt-Cassegrain)
2020 Feb. 17.27, 13.8, 4.4' (C. Hergenrother, 0.25-m reflector)
2020 Feb. 17.07, 14.9, 1' (M. Masek, 0.25-m Schmidt-Cassegrain; 0.8' tail in p.a. 220)
2020 Feb. 17.07, 15.0, 1.2' (M. Masek, 0.25-m Schmidt-Cassegrain)
2020 Feb. 16.90, 14.9, 1.2' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Feb. 16.30, 14.9, 0.4' (G. van Buitenen, Mayhill, New Mexico (H06), 0.431-m Ritchey-Chretien)
2020 Feb. 15.93, 12.6, 1.5' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Feb. 03.94, 16.5, 0.4' (A. Novichonok, ISON-Kitab observatory, 0.36-m Ritchey-Chretien; 0.3' tail in p.a. 220)
2020 Feb. 02.05, 15.3, 0.56' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Jan. 31.22, 17.2, 0.4' (M. Masek, 0.25-m Schmidt-Cassegrain)
2020 Jan. 31.22, 16.7, 0.4' (M. Masek, 0.25-m Schmidt-Cassegrain)
2020 Jan. 31.09, 16.1, 0.37' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Jan. 29.02, 17.0, 0.3' (A. Novichonok, ISON-Kitab observatory, 0.36-m Ritchey-Chretien)
2020 Jan. 24.05, 16.7, 1.1' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.6' tail in p.a. 266)
2020 Jan. 22.00, 16.8, 1.3' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Jan. 21.02, 17.0, 1.2' (T. Lehmann, Weimar, 0.2-m Newtonian reflector)
2020 Jan. 21.01, 16.5, 1.7' (S. Fritsche, Koeditz, 0.1-m refractor; 1.3' tail in p.a. 260)

C/2020 A2 (Iwamoto)
Total-magnitude and coma-diameter estimates:
2020 Feb. 19.86, 11.4, 2.1' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2020 Feb. 19.79, 11.5, 2' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 0.25-m Newtonian reflector)
2020 Feb. 18.79, 12.3, 1' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2020 Feb. 16.23, 12.6, 3.8' (K. Hills, 0.5-m Newtonian reflector)
2020 Feb. 15.99, 10.8, 3' (P. Guzik, 25x100 binoculars)
2020 Feb. 13.17, 11.5, 1.5' (U. Pilz, 0.32-m Newtonian reflector)
2020 Feb. 08.17, 11.4, 1.5' (M. Paradowski, Lublin, Poland, 0.054-m reflector)
2020 Feb. 08.17, 11.2, 1.8' (M. Paradowski, Lublin, Poland, 0.054-m reflector)
2020 Feb. 07.26, 12.3, 3.2' (K. Hills, 0.5-m Newtonian reflector)
2020 Feb. 07.17, 10.2, 2.82' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Feb. 06.54, 10.0, 2' (C. Hergenrother, 30x125 binoculars)
2020 Feb. 06.23, 10.2, 2.5' (M. Meyer, 0.254-m Newtonian reflector)
2020 Feb. 06.22, 12.2, 3.2' (N. James, 970, 0.28-m Schmidt-Cassegrain)
2020 Feb. 05.19, 10.1, 2.8' (C. Harder, Jeersdorf, Germany f, 0.3-m Newtonian reflector)
2020 Feb. 05.19, 10.6, 3.5' (T. Karhula, Virsbo, Sweden, 25x100 binoculars)
2020 Feb. 04.18, 10.4, 2.8' (C. Harder, Jeersdorf, Germany h, 0.3-m Newtonian reflector)
2020 Feb. 03.19, 9.6, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2020 Feb. 02.19, 11.9, 0.94' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Feb. 01.53, 12.8, 2.1' (G. van Buitenen, Mayhill, New Mexico (H06), 0.25-m Newtonian reflector)
2020 Jan. 31.83, 10.9, 2.8' (S. Yoshida, 0.4-m Newtonian reflector)
2020 Jan. 29.25, 13.0, 1.69' (N. James, 970, 0.28-m Schmidt-Cassegrain)
2020 Jan. 27.54, 11.3, 6.6' (T. Lehmann, Mayhill (remote), 0.28-m Newtonian reflector)
2020 Jan. 24.21, 11.5, 4.8' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Jan. 23.52, 11.2, 9.9' (T. Lehmann, Mayhill (remote), 0.106-m refractor)
2020 Jan. 22.22, 11.4, 6.3' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Jan. 21.23, 11.4, 6' (S. Fritsche, Koeditz, 0.1-m refractor)

A/2019 C1
Total-magnitude and coma-diameter estimates:
2020 Jan. 31.85, 17.3, -- (A. Novichonok, ISON-Kitab observatory, 0.36-m Ritchey-Chretien; 15.0" tail in p.a. 296)

A/2019 U6
Total-magnitude and coma-diameter estimates:
2020 Feb. 06.66, 17.4, -- (A. Novichonok, ISON-Kitab observatory, 0.36-m Ritchey-Chretien)
2020 Jan. 31.62, 17.5, -- (A. Novichonok, ISON-Kitab observatory, 0.36-m Ritchey-Chretien)

P/2019 Y2 (Fuls)
Total-magnitude and coma-diameter estimates:
2020 Feb. 01.10, 16.1, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 24.14, 16.3, 1.2' (S. Fritsche, Koeditz, 0.1-m refractor; 0.6' tail in p.a. 289)
2020 Jan. 22.21, 15.9, 0.5' (K. Hills, 0.5-m Newtonian reflector)