Recent Comet Brightness Estimates

2I/Borisov
Total-magnitude and coma-diameter estimates:
2020 Jan. 04.73, 15.3, 1.9' (T. Lehmann, SSO (remote), 0.51-m Newtonian reflector; 2.4' tail in p.a. 317)
2020 Jan. 04.22, 15.3, 0.6' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 30.52, 15.3, 1.7' (T. Lehmann, Mayhill (remote), 0.51-m Newtonian reflector; 0.05-deg tail in p.a. 306)
2019 Dec. 27.86, 14.3, 0.3' (S. Murakami, Aso Kumamoto, Japan 940 m above sea level, 0.457-m Newtonian reflector)
2019 Dec. 25.29, 16.4, 0.5' (M. Masek, 0.3-m Cassegrain reflector; 0.5' tail in p.a. 315)
2019 Dec. 23.26, 15.0, 0.7' (K. Hills, 0.5-m Newtonian reflector)

29P/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates:
2020 Jan. 16.78, 13.3, 0.9' (W. Kutschera, 0.54-m Newtonian reflector)
2020 Jan. 10.83, 14.2, 0.9' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 09.82, 14.3, 0.8' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 08.85, 14.2, 1' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 06.76, 14.0, 3.2' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Jan. 01.92, 13.2, 0.9' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 01.86, 13.5, 4.1' (S. Fritsche, Koeditz, 0.1-m refractor)
2019 Dec. 31.81, 13.6, 1.1' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 31.72, 15.2, 1.3' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Dec. 30.86, [14.5, -- (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Dec. 30.84, 13.3, 4' (P. Dekelver, 0.3-m Newtonian reflector)
2019 Dec. 29.81, 13.1, 1' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 28.81, 13.2, 1.8' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 27.81, 13.4, 1.8' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 27.47, [15.7, -- (C. Wyatt, 0.4-m Newtonian reflector)
2019 Dec. 26.83, 12.9, 1.9' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 23.81, 13.2, 1.6' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 22.81, 12.9, 1.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 21.85, [14.0, 0.5' (C. Harder, Jeersdorf, Germany f, 0.3-m Newtonian reflector)
2019 Dec. 20.87, 12.9, 2.1' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 19.92, 12.8, 1.5' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 19.88, 13.6, 0.5' (G. Scheerle, 0.235-m Schmidt-Cassegrain)

31P/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates:
2020 Jan. 04.14, 19.3, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 27.13, 19.3, 0.2' (K. Hills, 0.5-m Newtonian reflector)

68P/Klemola
Total-magnitude and coma-diameter estimates:
2020 Jan. 06.72, 15.3, 1.4' (S. Fritsche, Koeditz, 0.1-m refractor)

76P/West-Kohoutek-Ikemura
Total-magnitude and coma-diameter estimates:
2020 Jan. 04.05, 17.6, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 02.05, 16.9, 0.9' (S. Fritsche, Koeditz, 0.1-m refractor; 0.5' tail in p.a. 266)
2019 Dec. 31.84, 17.6, 0.3' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Dec. 31.10, 16.3, 1.2' (P. Dekelver, 0.3-m Newtonian reflector; 1.6' tail in p.a. 277)
2019 Dec. 31.04, 17.3, 1' (S. Fritsche, Koeditz, 0.1-m refractor; 0.5' tail in p.a. 267)
2019 Dec. 29.11, 17.1, 0.8' (S. Fritsche, Koeditz, 0.1-m refractor; 0.6' tail in p.a. 265)
2019 Dec. 28.06, 16.7, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 21.16, 17.4, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 21.14, 17.6, 0.8' (P. Dekelver, 0.3-m Newtonian reflector; 1.6' tail in p.a. 280)

78P/Gehrels
Total-magnitude and coma-diameter estimates:
2020 Jan. 04.02, 15.1, 0.6' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 02.21, 15.1, 0.3' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2020 Jan. 02.09, 15.8, 1.4' (S. Fritsche, Koeditz, 0.1-m refractor; 0.08-deg tail in p.a. 288)
2020 Jan. 02.06, 15.6, 1.8' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.19-deg tail in p.a. 289)
2020 Jan. 01.08, 16.2, 0.6' (J. Hadač, 0.13-m Newtonian reflector)
2019 Dec. 31.08, 15.2, 1.2' (P. Dekelver, 0.3-m Newtonian reflector; 2.0' tail in p.a. 299)
2019 Dec. 29.08, 15.8, 1.7' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.13-deg tail in p.a. 283)
2019 Dec. 29.07, 15.8, 1.4' (S. Fritsche, Koeditz, 0.1-m refractor; 0.05-deg tail in p.a. 286)
2019 Dec. 28.71, 15.3, 0.3' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Dec. 28.04, 15.1, 0.6' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 21.15, 15.5, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 20.98, 15.9, 0.6' (P. Dekelver, 0.3-m Newtonian reflector; 1.1' tail in p.a. 289)
2019 Dec. 20.08, 16.0, 1.3' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.24-deg tail in p.a. 287)

87P/Bus
Total-magnitude and coma-diameter estimates:
2020 Jan. 02.15, 19.1, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 31.23, 19.4, 0.2' (K. Hills, 0.5-m Newtonian reflector)

88P/Howell
Total-magnitude and coma-diameter estimates:
2020 Jan. 02.19, 18.2, 0.6' (T. Lehmann, Weimar, 0.2-m Newtonian reflector)
2019 Dec. 31.19, 14.6, 1' (W. Kutschera, 0.54-m Newtonian reflector)
2019 Dec. 29.18, 18.7, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 28.52, 18.9, -- (G. van Buitenen, Mayhill, New Mexico (H06), 0.51-m Ritchey-Chretien)

95P/Chiron
Total-magnitude and coma-diameter estimates:
2019 Dec. 26.84, 18.1, 0.2' (K. Hills, 0.5-m Newtonian reflector)

101P/Chernykh
Total-magnitude and coma-diameter estimates:
2019 Dec. 26.94, 15.4, 0.8' (K. Hills, 0.5-m Newtonian reflector)

114P/Wiseman-Skiff
Total-magnitude and coma-diameter estimates:
2020 Jan. 16.81, 13.8, 0.7' (W. Kutschera, 0.54-m Newtonian reflector)
2020 Jan. 12.71, 14.1, 0.7' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2020 Jan. 11.81, 14.1, 2' (P. Dekelver, 0.3-m Newtonian reflector; 1.4' tail in p.a. 74)
2020 Jan. 02.70, 14.2, 2' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.05-deg tail in p.a. 77)
2020 Jan. 01.96, 13.9, 3.4' (S. Fritsche, Koeditz, 0.1-m refractor; 0.05-deg tail in p.a. 72)
2020 Jan. 01.91, 14.0, 1.6' (P. Dekelver, 0.3-m Newtonian reflector; 0.9' tail in p.a. 79)
2019 Dec. 31.75, 14.8, 1' (J. Warell, 0.25-m Schmidt-Cassegrain; 1.0' tail in p.a. 79)
2019 Dec. 30.90, 14.0, 3.3' (S. Fritsche, Koeditz, 0.1-m refractor; 1.6' tail in p.a. 84)
2019 Dec. 30.89, 14.1, 2.8' (P. Dekelver, 0.3-m Newtonian reflector; 1.9' tail in p.a. 77)
2019 Dec. 30.88, 14.1, 2.6' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.07-deg tail in p.a. 77)
2019 Dec. 30.86, 14.8, 0.5' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Dec. 30.81, 13.9, 0.6' (W. Hasubick, 0.44-m Newtonian reflector)
2019 Dec. 29.82, 14.5, 1.4' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.05-deg tail in p.a. 72)
2019 Dec. 29.80, 14.5, 1.8' (S. Fritsche, Koeditz, 0.1-m refractor; 2.0' tail in p.a. 80)
2019 Dec. 28.49, 14.5, 1' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Dec. 27.91, 13.4, 1.1' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 27.48, 14.8, 0.5' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Dec. 27.10, 12.9, 1.12' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2019 Dec. 21.88, 13.8, 3.1' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.07-deg tail in p.a. 85)
2019 Dec. 20.92, 13.4, 1.1' (K. Hills, 0.5-m Newtonian reflector)

124P/Mrkos
Total-magnitude and coma-diameter estimates:
2019 Dec. 31.85, 17.5, 0.2' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Dec. 31.26, 18.2, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 31.09, 18.7, 0.5' (S. Fritsche, Koeditz, 0.1-m refractor)
2019 Dec. 24.13, 18.5, 0.3' (K. Hills, 0.5-m Newtonian reflector)

155P/Shoemaker
Total-magnitude and coma-diameter estimates:
2020 Jan. 05.10, 15.2, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2020 Jan. 04.32, 15.8, 1.3' (T. Lehmann, Mayhill (remote), 0.51-m Newtonian reflector; 0.09-deg tail in p.a. 288)
2020 Jan. 02.18, 15.4, 0.4' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2020 Jan. 02.13, 15.6, 1.8' (S. Fritsche, Koeditz, 0.1-m refractor; 0.14-deg tail in p.a. 290)
2020 Jan. 01.01, 15.9, 0.7' (J. Hadač, 0.13-m Newtonian reflector; 0.8' tail in p.a. 272)
2019 Dec. 31.14, 15.6, 1.5' (S. Fritsche, Koeditz, 0.1-m refractor; 1.9' tail in p.a. 287)
2019 Dec. 31.12, 15.4, 2' (P. Dekelver, 0.3-m Newtonian reflector; 6.2' tail in p.a. 292)
2019 Dec. 31.12, 14.2, 1.2' (W. Kutschera, 0.54-m Newtonian reflector)
2019 Dec. 29.15, 15.1, 2.4' (S. Fritsche, Koeditz, 0.1-m refractor; 0.04-deg tail in p.a. 285)
2019 Dec. 29.14, 15.7, 1.3' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.24-deg tail in p.a. 291)
2019 Dec. 29.13, 15.4, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 27.20, 15.6, 0.37' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2019 Dec. 22.23, 15.6, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 21.01, 15.8, 1.2' (P. Dekelver, 0.3-m Newtonian reflector; 2.0' tail in p.a. 294)

159P/LONEOS
Total-magnitude and coma-diameter estimates:
2020 Jan. 04.13, 18.2, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 24.12, 18.2, 0.4' (K. Hills, 0.5-m Newtonian reflector)

160P/LINEAR
Total-magnitude and coma-diameter estimates:
2020 Jan. 12.69, 14.6, 0.3' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)

173P/Mueller
Total-magnitude and coma-diameter estimates:
2019 Dec. 23.00, 17.3, 0.3' (K. Hills, 0.5-m Newtonian reflector)

174P/Echeclus
Total-magnitude and coma-diameter estimates:
2020 Jan. 02.08, 18.9, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 29.96, 19.1, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 26.91, 18.6, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 22.97, 19.0, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 19.93, 18.7, 0.2' (K. Hills, 0.5-m Newtonian reflector)

203P/Korlevic
Total-magnitude and coma-diameter estimates:
2019 Dec. 29.88, 17.6, 0.2' (K. Hills, 0.5-m Newtonian reflector)

223P/Skiff
Total-magnitude and coma-diameter estimates:
2019 Dec. 24.07, 19.6, 0.2' (K. Hills, 0.5-m Newtonian reflector)

246P/NEAT
Total-magnitude and coma-diameter estimates:
2020 Jan. 04.23, 16.5, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 28.29, 16.9, 0.3' (K. Hills, 0.5-m Newtonian reflector)

260P/McNaught
Total-magnitude and coma-diameter estimates:
2020 Jan. 14.12, 14.6, 2.9' (T. Lehmann, Mayhill (remote), 0.106-m refractor; 0.04-deg tail in p.a. 196)
2020 Jan. 06.84, 14.2, 1.8' (S. Fritsche, Koeditz, 0.1-m refractor; 1.1' tail in p.a. 222)
2020 Jan. 02.01, 14.2, 2.6' (S. Fritsche, Koeditz, 0.1-m refractor; 2.0' tail in p.a. 224)
2019 Dec. 31.81, 14.3, 1.1' (J. Hadač, 0.13-m Newtonian reflector)
2019 Dec. 30.93, 14.4, 2.2' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.04-deg tail in p.a. 190)
2019 Dec. 30.91, 13.4, 1.6' (P. Dekelver, 0.3-m Newtonian reflector; 1.4' tail in p.a. 214)
2019 Dec. 29.83, 14.3, 2.3' (S. Fritsche, Koeditz, 0.1-m refractor; 2.0' tail in p.a. 223)
2019 Dec. 29.02, 14.1, 2.6' (S. Fritsche, Koeditz, 0.1-m refractor; 0.05-deg tail in p.a. 226)
2019 Dec. 28.98, 14.1, 2.2' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 2.4' tail in p.a. 184)
2019 Dec. 28.44, 14.8, 0.4' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Dec. 27.92, 14.1, 1' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 27.13, 13.3, 0.94' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2019 Dec. 24.95, 13.4, 0.5' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2019 Dec. 22.84, 12.9, 1.3' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2019 Dec. 21.98, 13.7, 3' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.05-deg tail in p.a. 195)
2019 Dec. 20.94, 13.1, 1' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 19.85, [12.9, -- (A. Novichonok, observatory, +11C, 0.2-m Newtonian reflector)

261P/Larson
Total-magnitude and coma-diameter estimates:
2019 Dec. 27.93, 17.6, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 20.96, 16.9, 0.3' (K. Hills, 0.5-m Newtonian reflector)

266P/Christensen
Total-magnitude and coma-diameter estimates:
2019 Dec. 31.00, 17.3, 0.8' (P. Dekelver, 0.3-m Newtonian reflector)
2019 Dec. 30.96, 18.0, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 23.96, 17.6, 0.3' (K. Hills, 0.5-m Newtonian reflector)

289P/Blanpain
Total-magnitude and coma-diameter estimates:
2020 Jan. 15.74, 17.2, 1.1' (T. Lehmann, Weimar, 0.2-m Newtonian reflector)
2020 Jan. 06.85, 17.0, 1.2' (T. Lehmann, Weimar, 0.2-m Newtonian reflector)
2019 Dec. 31.74, 17.2, 1.4' (T. Lehmann, Weissenkirchen, 0.28-m Newtonian reflector)

384P/Kowalski
Total-magnitude and coma-diameter estimates:
2019 Dec. 30.99, 18.7, 0.5' (S. Fritsche, Koeditz, 0.1-m refractor)
2019 Dec. 30.95, 17.9, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 23.22, 18.2, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2010 U3 (Boattini)
Total-magnitude and coma-diameter estimates:
2019 Dec. 31.90, 17.0, 0.3' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Dec. 31.18, 17.4, 0.7' (S. Fritsche, Koeditz, 0.1-m refractor)

C/2011 KP36 (Spacewatch)
Total-magnitude and coma-diameter estimates:
2019 Dec. 27.97, 18.3, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 21.01, 18.6, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2015 O1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Dec. 31.04, 16.2, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 21.13, 16.6, 0.6' (K. Hills, 0.5-m Newtonian reflector)

C/2016 M1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Dec. 28.98, 14.0, 0.8' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 21.02, 13.4, 0.8' (K. Hills, 0.5-m Newtonian reflector)

C/2016 N6 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Dec. 26.18, 16.3, 0.5' (M. Masek, 0.3-m Cassegrain reflector)

C/2016 X1 (Lemmon)
Total-magnitude and coma-diameter estimates:
2019 Dec. 24.10, 18.6, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2017 B3 (LINEAR)
Total-magnitude and coma-diameter estimates:
2019 Dec. 28.46, 14.8, 0.4' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Dec. 27.47, 14.8, 0.3' (C. Wyatt, 0.4-m Newtonian reflector)

C/2017 K2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2020 Jan. 02.22, 16.6, 1.2' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Jan. 01.73, 16.2, 0.9' (T. Lehmann, Weimar, 0.2-m Newtonian reflector)
2020 Jan. 01.26, 15.4, 0.5' (M. Masek, 0.25-m Schmidt-Cassegrain)
2020 Jan. 01.26, 15.7, 0.5' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Dec. 29.23, 16.5, 0.8' (S. Fritsche, Koeditz, 0.1-m refractor)
2019 Dec. 21.73, 16.5, 0.9' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.4' tail in p.a. 331)

C/2017 T2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2020 Jan. 17.83, 9.9, 2.1' (J. Cerny, 0.355-m Newtonian reflector; 10.8' tail in p.a. 120)
2020 Jan. 17.79, 10.3, 4' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 0.25-m Newtonian reflector)
2020 Jan. 17.78, 8.5, 2.8' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain; 5.7' tail in p.a. 121)
2020 Jan. 16.95, 9.5, 3' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 0.25-m Newtonian reflector)
2020 Jan. 16.92, 9.9, 1.5' (M. Masek, 0.4-m Newtonian reflector; 2.4' tail in p.a. 125)
2020 Jan. 16.90, 9.4, 3' (C. Harder, Jeersdorf, Germany h, 0.3-m Newtonian reflector; 8.0' tail in p.a. 120)
2020 Jan. 16.89, 9.0, 4.3' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Jan. 16.88, 9.2, 5' (T. Karhula, Virsbo, Sweden, 18x50 binoculars)
2020 Jan. 16.86, 9.8, 2.1' (W. Kutschera, 0.25-m Newtonian reflector; 0.07-deg tail)
2020 Jan. 16.80, 9.6, 2.7' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2020 Jan. 16.77, 10.5, 3' (U. Pilz, 0.32-m Newtonian reflector; 0.07-deg tail in p.a. 182)
2020 Jan. 16.77, 9.6, 4' (M. Meyer, 0.254-m Newtonian reflector; 0.1-deg tail in p.a. 115)
2020 Jan. 16.77, 10.6, 3.2' (P. Dekelver, 0.3-m Newtonian reflector; 16.2' tail in p.a. 154)
2020 Jan. 16.76, 9.5, 3' (C. Harder, Jeersdorf, Germany h, 0.195-m Newtonian reflector; 4.5' tail in p.a. 120)
2020 Jan. 15.90, 10.4, 3.2' (P. Dekelver, 0.3-m Newtonian reflector; 13.1' tail in p.a. 151)
2020 Jan. 15.87, 9.7, 4' (A. Scholten, Eerbeek, 0.2-m Newtonian reflector)
2020 Jan. 15.84, 10.3, 4.14' (N. James, 970, 0.28-m Schmidt-Cassegrain)
2020 Jan. 15.81, 9.2, 17' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.26-deg tail in p.a. 151)
2020 Jan. 15.81, 9.7, 2.8' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2020 Jan. 15.76, 10.7, 7.7' (M. Lostak, 0.2-m Newtonian reflector)
2020 Jan. 15.75, 8.9, 5' (P. Guzik, 10x50 binoculars)
2020 Jan. 14.75, 9.7, 2.8' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2020 Jan. 14.10, 9.7, 2.5' (C. Hergenrother, 30x125 binoculars)
2020 Jan. 13.78, 9.2, 1.2' (U. Pilz, 0.105-m refractor; 0.05-deg tail in p.a. 155)
2020 Jan. 12.75, 8.8, 3.5' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain; 6.0' tail in p.a. 147)
2020 Jan. 12.73, 10.2, 1.3' (S. Szabo, Agfalva, 0.6-m Newtonian reflector; 4.0' tail in p.a. 130)
2020 Jan. 12.07, 9.7, 4' (C. Hergenrother, 30x125 binoculars)
2020 Jan. 11.77, 10.7, 3.2' (P. Dekelver, 0.3-m Newtonian reflector; 16.3' tail in p.a. 152)
2020 Jan. 10.82, 8.9, 3.2' (P. Dekelver, 0.3-m Newtonian reflector; 14.9' tail in p.a. 163)
2020 Jan. 10.07, 10.4, 1.18' (S. Aguirre, Hermosillo, Sonora,Mex. , 0.2-m Schmidt-Cassegrain)
2020 Jan. 07.12, 9.8, 3' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2020 Jan. 06.96, 9.0, 6' (D. Buczynski, Tarbatness I81, 0.3-m Newtonian reflector)
2020 Jan. 06.94, 9.3, 18' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.34-deg tail in p.a. 161)
2020 Jan. 06.94, 9.3, 21' (T. Lehmann, Weimar, 0.075-m reflector; 0.33-deg tail in p.a. 162)
2020 Jan. 06.88, 9.5, 14' (S. Fritsche, Koeditz, 0.1-m refractor; 0.25-deg tail in p.a. 163)
2020 Jan. 06.83, 9.4, 3' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2020 Jan. 06.83, 10.0, 3.2' (P. Dekelver, 0.3-m Newtonian reflector; 14.9' tail in p.a. 165)
2020 Jan. 05.12, 9.6, 4' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2020 Jan. 04.97, 9.7, 2' (T. Karhula, Virsbo, Sweden, 0.305-m Newtonian reflector)
2020 Jan. 04.75, 10.3, 1.2' (U. Pilz, 0.105-m refractor)
2020 Jan. 02.96, 10.0, 2.3' (J. Cerny, 0.355-m Newtonian reflector; 14.4' tail in p.a. 160)
2020 Jan. 02.94, 9.8, 3.3' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2020 Jan. 02.90, 10.1, 6.7' (H. Kiiskinen, 0.4-m Ritchey-Chretien; 5.6' tail in p.a. 164)
2020 Jan. 02.02, 10.7, 0.8' (M. Masek, 0.4-m Newtonian reflector; 1.2' tail in p.a. 170)
2020 Jan. 01.94, 10.3, 1.7' (J. Cerny, 0.355-m Newtonian reflector; 4.8' tail in p.a. 160)
2020 Jan. 01.91, 9.2, 28' (S. Fritsche, Koeditz, 0.1-m refractor; 0.31-deg tail in p.a. 169)
2020 Jan. 01.86, 10.6, 4.3' (M. Masek, 0.2-m Newtonian reflector; 8.2' tail in p.a. 168)
2020 Jan. 01.84, 9.2, 16' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.36-deg tail in p.a. 170)
2020 Jan. 01.83, 9.2, 4' (G. Scheerle, 9x63 binoculars)
2019 Dec. 31.99, 9.4, 3.4' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 31.89, 11.1, 2.3' (J. Warell, 0.25-m Schmidt-Cassegrain; 10.9' tail in p.a. 156)
2019 Dec. 31.77, 10.8, 4.4' (J. Hadač, 0.13-m Newtonian reflector; 10.2' tail in p.a. 168)
2019 Dec. 31.73, 9.2, 5' (G. Scheerle, 9x63 binoculars)
2019 Dec. 31.73, 10.0, 5.5' (D. Swan, Tynemouth, UK, 0.2-m Schmidt-Cassegrain)
2019 Dec. 30.97, 9.3, 20' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.39-deg tail in p.a. 173)
2019 Dec. 30.94, 10.5, 3.2' (P. Dekelver, 0.3-m Newtonian reflector; 14.9' tail in p.a. 174)
2019 Dec. 30.94, 9.2, 28' (S. Fritsche, Koeditz, 0.1-m refractor; 0.27-deg tail in p.a. 172)
2019 Dec. 30.88, [ - , 2.5' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector; 7.5' tail in p.a. 167)
2019 Dec. 30.85, 9.3, 3' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain; 5.4' tail in p.a. 151)
2019 Dec. 30.81, 10.2, 1.8' (W. Hasubick, 0.44-m Newtonian reflector)
2019 Dec. 30.81, 9.7, 4' (A. Scholten, Eerbeek, 0.2-m Newtonian reflector)
2019 Dec. 30.77, 9.9, 2.5' (M. Meyer, 0.254-m Newtonian reflector; 0.04-deg tail in p.a. 160)
2019 Dec. 30.76, 10.0, 2.5' (J. Shanklin, 25x100 binoculars)
2019 Dec. 29.97, 9.4, 2' (J. Shanklin, 25x100 binoculars)
2019 Dec. 29.94, 9.4, 4' (G. Scheerle, 9x63 binoculars)
2019 Dec. 29.94, 9.2, 3' (G. Scheerle, 0.235-m Schmidt-Cassegrain; 0.28-deg tail in p.a. 170)
2019 Dec. 29.92, 9.3, 19' (T. Lehmann, Weissenkirchen, 0.28-m Newtonian reflector; 0.35-deg tail in p.a. 171)
2019 Dec. 29.82, 9.7, 2.2' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain; 3.6' tail in p.a. 166)
2019 Dec. 29.75, 9.2, 20' (S. Fritsche, Koeditz, 0.1-m refractor; 0.23-deg tail in p.a. 175)
2019 Dec. 29.10, 9.8, 2' (C. Harder, Jeersdorf, Germany h, 0.3-m Newtonian reflector; 4.0' tail in p.a. 155)
2019 Dec. 29.01, 9.4, 16' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.26-deg tail in p.a. 174)
2019 Dec. 28.98, 9.2, 21' (S. Fritsche, Koeditz, 0.1-m refractor; 0.27-deg tail in p.a. 176)
2019 Dec. 27.98, 9.9, 3' (A. Scholten, Eerbeek, 0.2-m Newtonian reflector)
2019 Dec. 27.92, 9.7, 4' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Dec. 27.90, 9.4, 3' (C. Labordena, La Serra, 0.2-m Schmidt-Cassegrain; 3.0' tail)
2019 Dec. 27.87, 9.9, 3' (V. Díaz, La Romana, Alicante, España, 0.127-m Newtonian reflector; 2.0' tail in p.a. 150)
2019 Dec. 27.87, 9.9, 2.5' (M. Meyer, 0.254-m Newtonian reflector; 0.04-deg tail in p.a. 160)
2019 Dec. 27.07, 9.3, 3.76' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2019 Dec. 26.96, 10.0, 2' (A. Novichonok, z observatory, +6C, 0.2-m Newtonian reflector; 2.0' tail in p.a. 180)
2019 Dec. 26.93, 9.5, 3.5' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 25.75, 9.3, 2.7' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain; 3.5' tail in p.a. 161)
2019 Dec. 24.97, 9.6, 2.6' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain; 3.3' tail in p.a. 164)
2019 Dec. 24.90, 9.4, 3.2' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2019 Dec. 24.86, 9.5, 2' (G. Scheerle, 9x63 binoculars)
2019 Dec. 23.94, 9.7, 3' (V. Díaz, La Romana, Alicante, España, 0.127-m Newtonian reflector)
2019 Dec. 23.89, 10.2, 4.5' (D. Swan, Tynemouth, UK, 0.2-m Schmidt-Cassegrain)
2019 Dec. 23.74, 9.0, 3.1' (J. Shanklin, 20x80 binoculars)
2019 Dec. 23.72, 9.2, 24' (S. Fritsche, Koeditz, 0.1-m refractor; 0.28-deg tail in p.a. 184)
2019 Dec. 22.89, 9.1, 2.5' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain; 5.3' tail in p.a. 162)
2019 Dec. 22.84, 9.2, 4.5' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2019 Dec. 22.79, 10.2, 2' (J. Navarro Pina, Campos del Rio ( Murcia , Spain ), 0.305-m Newtonian reflector)
2019 Dec. 22.02, 9.6, 14' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.32-deg tail in p.a. 184)
2019 Dec. 21.93, 9.4, 21' (T. Lehmann, Weimar, 0.075-m reflector; 0.31-deg tail in p.a. 183)
2019 Dec. 21.86, 10.0, 2' (C. Harder, Jeersdorf, Germany f, 0.3-m Newtonian reflector; 6.0' tail in p.a. 175)
2019 Dec. 21.76, 9.6, 2' (G. Scheerle, 9x63 binoculars)
2019 Dec. 21.73, 9.7, 15' (S. Fritsche, Koeditz, 0.1-m refractor; 0.23-deg tail in p.a. 185)
2019 Dec. 20.93, 9.8, 2.7' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2019 Dec. 20.93, 10.6, 3.57' (N. James, 970, 0.28-m Schmidt-Cassegrain)
2019 Dec. 20.92, 10.0, 3' (A. Scholten, Eerbeek, 0.2-m Newtonian reflector)
2019 Dec. 20.91, 9.7, 3' (P. Guzik, 25x100 binoculars)
2019 Dec. 20.89, 9.6, 3.1' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain; 3.6' tail in p.a. 169)
2019 Dec. 20.86, 10.5, 2.2' (P. Dekelver, 0.3-m Newtonian reflector; 15.7' tail in p.a. 186)
2019 Dec. 20.76, 9.9, 2' (G. van Buitenen, Dordrecht, NL, 0.3-m Newtonian reflector)
2019 Dec. 19.99, 9.6, 2.8' (G. Scheerle, 0.235-m Schmidt-Cassegrain; 0.12-deg tail in p.a. 180)
2019 Dec. 19.98, 9.3, 2.8' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 19.97, 9.4, 15' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.33-deg tail in p.a. 186)
2019 Dec. 19.94, 9.7, 1.8' (C. Harder, Jeersdorf, Germany f, 0.3-m Newtonian reflector; 6.0' tail in p.a. 165)
2019 Dec. 19.91, 9.6, 2.8' (G. Scheerle, 0.235-m Schmidt-Cassegrain; 0.07-deg tail in p.a. 180)
2019 Dec. 19.86, 10.4, 1.6' (A. Novichonok, Simeiz observatory, 0.2-m Newtonian reflector; 2.0' tail in p.a. 180)
2019 Dec. 19.85, 10.1, 2.5' (M. Meyer, 0.254-m Newtonian reflector; 0.08-deg tail in p.a. 180)
2019 Dec. 19.73, 10.2, 2.5' (A. Novichonok, With Nikon D5200 (138-mm lens), 0.028-m refractor; 5.0' tail in p.a. 180)
2019 Dec. 19.71, 10.1, 1.5' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 40x100 binoculars)

C/2018 A3 (ATLAS)
Total-magnitude and coma-diameter estimates:
2019 Dec. 30.87, 19.2, 1.2' (P. Dekelver, 0.3-m Newtonian reflector)
2019 Dec. 27.88, 18.2, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 20.99, 18.0, 0.3' (K. Hills, 0.5-m Newtonian reflector)

C/2018 A6 (Gibbs)
Total-magnitude and coma-diameter estimates:
2019 Dec. 28.46, 14.6, 0.3' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Dec. 27.45, 14.6, 0.5' (C. Wyatt, 0.4-m Newtonian reflector)

C/2018 F4 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Dec. 28.66, 13.8, 0.8' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Dec. 27.50, 13.9, 0.8' (C. Wyatt, 0.4-m Newtonian reflector)

C/2018 N2 (ASASSN)
Total-magnitude and coma-diameter estimates:
2020 Jan. 17.77, 12.4, 1' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 0.25-m Newtonian reflector)
2020 Jan. 16.87, 11.5, 1.5' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2020 Jan. 16.80, 12.5, 1.2' (W. Kutschera, 0.54-m Newtonian reflector)
2020 Jan. 16.78, 12.3, 0.9' (M. Meyer, 0.254-m Newtonian reflector)
2020 Jan. 16.75, 12.4, 1.8' (U. Pilz, 0.32-m Newtonian reflector)
2020 Jan. 14.09, 12.4, 5.5' (T. Lehmann, Mayhill (remote), 0.106-m refractor; 0.13-deg tail in p.a. 131)
2020 Jan. 11.77, 10.6, 3.2' (P. Dekelver, 0.3-m Newtonian reflector; 13.1' tail in p.a. 159)
2020 Jan. 10.87, 12.1, 2.4' (P. Dekelver, 0.3-m Newtonian reflector; 4.7' tail in p.a. 135)
2020 Jan. 06.97, 11.9, 1.5' (D. Buczynski, Tarbatness I81, 0.3-m Newtonian reflector)
2020 Jan. 06.85, 12.7, 2.9' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.08-deg tail in p.a. 137)
2020 Jan. 06.79, 12.3, 3.9' (S. Fritsche, Koeditz, 0.1-m refractor; 0.09-deg tail in p.a. 136)
2020 Jan. 06.74, 12.2, 2' (P. Dekelver, 0.3-m Newtonian reflector; 7.0' tail in p.a. 140)
2020 Jan. 01.82, 12.5, 4.6' (S. Fritsche, Koeditz, 0.1-m refractor; 0.15-deg tail in p.a. 139)
2020 Jan. 01.79, 12.6, 3.3' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.12-deg tail in p.a. 135)
2019 Dec. 30.85, 12.3, 1.3' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Dec. 30.84, 12.6, 3.3' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.13-deg tail in p.a. 135)
2019 Dec. 30.81, 12.4, 2.8' (P. Dekelver, 0.3-m Newtonian reflector; 8.8' tail in p.a. 140)
2019 Dec. 30.81, 12.6, 1.6' (P. Dekelver, 0.3-m Newtonian reflector; 7.7' tail in p.a. 142)
2019 Dec. 30.78, 11.8, 1.3' (M. Meyer, 0.254-m Newtonian reflector)
2019 Dec. 29.82, 12.2, 1.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 29.78, 12.6, 2.9' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.12-deg tail in p.a. 138)
2019 Dec. 29.70, 12.6, 4.4' (S. Fritsche, Koeditz, 0.1-m refractor; 0.18-deg tail in p.a. 146)
2019 Dec. 27.94, 11.5, 2' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Dec. 27.89, 11.8, 1.6' (M. Meyer, 0.254-m Newtonian reflector)
2019 Dec. 24.92, 11.0, 3.9' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2019 Dec. 21.86, 11.7, 1.5' (C. Harder, Jeersdorf, Germany f, 0.3-m Newtonian reflector)
2019 Dec. 21.78, 12.4, 3.9' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.15-deg tail in p.a. 136)
2019 Dec. 19.84, 12.1, 1.4' (M. Meyer, 0.254-m Newtonian reflector)
2019 Dec. 19.84, 12.5, 3.2' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.13-deg tail in p.a. 139)
2019 Dec. 19.81, 12.5, 0.8' (A. Novichonok, observatory, +11C, 0.2-m Newtonian reflector)
2019 Dec. 19.72, 11.8, 1' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 40x100 binoculars)
2019 Dec. 19.68, 12.4, 1.5' (A. Novichonok, With Nikon D5200 (138-mm lens), 0.026-m refractor; 2.0' tail in p.a. 144)

C/2018 W2 (Africano)
Total-magnitude and coma-diameter estimates:
2019 Dec. 28.45, 14.9, 0.5' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Dec. 27.45, 14.2, 0.8' (C. Wyatt, 0.4-m Newtonian reflector)

C/2019 F1 (ATLAS-Africano)
Total-magnitude and coma-diameter estimates:
2020 Jan. 01.28, 17.0, 0.3' (K. Hills, 0.5-m Newtonian reflector)

C/2019 K5 (YOUNG)
Total-magnitude and coma-diameter estimates:
2019 Dec. 31.00, 17.0, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 23.88, 16.6, 0.6' (K. Hills, 0.5-m Newtonian reflector)

C/2019 K8 (ATLAS)
Total-magnitude and coma-diameter estimates:
2019 Dec. 27.15, 18.4, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2019 L3 (ATLAS)
Total-magnitude and coma-diameter estimates:
2020 Jan. 06.75, 17.4, 0.6' (T. Lehmann, Weimar, 0.2-m Newtonian reflector)
2020 Jan. 01.77, 17.2, 0.6' (S. Fritsche, Koeditz, 0.1-m refractor)
2019 Dec. 28.83, 17.1, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 19.76, 17.6, 0.5' (T. Lehmann, Weimar, 0.2-m Newtonian reflector)

C/2019 N1 (ATLAS)
Total-magnitude and coma-diameter estimates:
2020 Jan. 02.17, 16.8, 1' (S. Fritsche, Koeditz, 0.1-m refractor; 0.6' tail in p.a. 47)
2019 Dec. 29.20, 16.6, 0.8' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.6' tail in p.a. 33)
2019 Dec. 29.19, 16.6, 0.9' (S. Fritsche, Koeditz, 0.1-m refractor; 0.2' tail in p.a. 52)

C/2019 T3 (ATLAS)
Total-magnitude and coma-diameter estimates:
2019 Dec. 27.94, 17.7, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 20.98, 17.9, 0.3' (K. Hills, 0.5-m Newtonian reflector)

C/2019 T4 (ATLAS)
Total-magnitude and coma-diameter estimates:
2019 Dec. 28.97, 17.6, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2019 Y1 (ATLAS)
Total-magnitude and coma-diameter estimates:
2020 Jan. 15.07, 15.2, 0.38' (G. van Buitenen, Mayhill, New Mexico (H06), 0.51-m Ritchey-Chretien)
2019 Dec. 20.11, 16.1, 1.2' (M. Masek, 0.3-m Cassegrain reflector)

C/2020 A2 (Iwamoto)
Total-magnitude and coma-diameter estimates:
2020 Jan. 15.28, 12.9, 1.5' (M. Masek, 0.25-m Schmidt-Cassegrain)

A/2019 C1
Total-magnitude and coma-diameter estimates:
2019 Dec. 29.17, 17.0, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Dec. 22.20, 17.1, 0.2' (K. Hills, 0.5-m Newtonian reflector)

P/2019 Y2 (Fuls)
Total-magnitude and coma-diameter estimates:
2019 Dec. 22.31, 18.3, 0.3' (M. Masek, 0.3-m Cassegrain reflector)