Recent Comet Brightness Estimates

29P/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates:
2019 Oct. 20.85, 14.8, 0.2' (P. Guzik, 0.326-m Newtonian reflector)
2019 Oct. 19.92, 13.8, 1.7' (K. Hills, 0.5-m Newtonian reflector)
2019 Oct. 19.48, 13.9, 0.8' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Oct. 18.41, 13.7, 1.2' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Oct. 17.89, 13.5, 1.6' (K. Hills, 0.5-m Newtonian reflector)
2019 Oct. 09.85, 13.1, 1' (K. Hills, 0.5-m Newtonian reflector)
2019 Oct. 08.94, 13.1, 1.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Oct. 08.03, [14.5, 0.5' (P. Guzik, 0.326-m Newtonian reflector)
2019 Oct. 07.86, 13.3, 1.6' (K. Hills, 0.5-m Newtonian reflector)
2019 Oct. 06.93, 12.4, 1.7' (K. Hills, 0.5-m Newtonian reflector)
2019 Oct. 06.11, 13.3, 3' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Oct. 06.11, 12.4, 4' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Oct. 05.99, 13.2, 4' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Oct. 05.96, 12.8, 2.4' (K. Hills, 0.5-m Newtonian reflector)
2019 Oct. 04.87, 13.0, 1.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Oct. 04.20, 13.4, 3' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Oct. 04.20, 12.4, 4' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Oct. 03.87, 13.0, 1.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Oct. 03.69, 14.6, 0.9' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Oct. 03.04, 15.0, 0.3' (C. Harder, Jeersdorf, f, 0.531-m Newtonian reflector)
2019 Oct. 02.93, 12.7, 2.5' (K. Hills, 0.5-m Newtonian reflector)
2019 Oct. 02.92, 12.0, 9.7' (S. Fritsche, Köditz, 0.1-m refractor; 0.16-deg tail in p.a. 231)
2019 Oct. 02.69, 14.7, 0.9' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Oct. 01.91, 13.1, 2.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Oct. 01.44, 14.8, 0.8' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Oct. 01.15, 12.7, 4' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Oct. 01.15, 12.0, 5' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Sep. 30.89, 12.0, 11' (S. Fritsche, Köditz, 0.1-m refractor; 0.16-deg tail in p.a. 235)
2019 Sep. 30.88, 12.7, 2.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Sep. 27.92, 12.7, 2.8' (K. Hills, 0.5-m Newtonian reflector)
2019 Sep. 26.92, 12.8, 2.6' (K. Hills, 0.5-m Newtonian reflector)
2019 Sep. 26.01, 12.0, 5' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Sep. 26.01, 12.7, 4' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Sep. 25.08, 12.5, 2.8' (K. Hills, 0.5-m Newtonian reflector)
2019 Sep. 24.53, 14.6, 1' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Sep. 23.91, 12.6, 1.5' (K. Hills, 0.5-m Newtonian reflector)
2019 Sep. 23.55, 14.7, 1.3' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Sep. 23.00, 12.9, 2.7' (K. Hills, 0.5-m Newtonian reflector)
2019 Sep. 22.87, 14.7, 0.3' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)

68P/Klemola
Total-magnitude and coma-diameter estimates:
2019 Oct. 18.40, 14.1, 0.5' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Oct. 14.75, 14.1, 1.4' (S. Fritsche, Koeditz, 0.1-m refractor)
2019 Oct. 10.77, 13.9, 1.5' (S. Fritsche, Köditz, 0.1-m refractor)
2019 Oct. 01.84, 13.7, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2019 Oct. 01.42, 13.3, 1.3' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Sep. 28.84, 10.6, 3' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Sep. 26.10, 12.7, 7.3' (T. Lehmann, Mayhill (remote), 0.106-m refractor)
2019 Sep. 25.42, 13.3, 1' (S. Yoshida, 0.4-m Newtonian reflector)
2019 Sep. 24.51, 13.5, 1' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Sep. 23.53, 12.7, 1.2' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Sep. 22.81, 14.6, 0.3' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)

78P/Gehrels
Total-magnitude and coma-diameter estimates:
2019 Oct. 06.23, 16.0, 0.5' (M. Masek, 0.25-m Schmidt-Cassegrain; 0.5' tail in p.a. 273)
2019 Oct. 06.23, 16.4, 0.5' (M. Masek, 0.25-m Schmidt-Cassegrain; 0.5' tail in p.a. 272)
2019 Sep. 27.22, 16.1, 0.5' (M. Masek, 0.25-m Schmidt-Cassegrain; 0.7' tail in p.a. 274)

95P/Chiron
Total-magnitude and coma-diameter estimates:
2019 Oct. 02.98, 17.9, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Sep. 26.02, 17.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)

101P/Chernykh
Total-magnitude and coma-diameter estimates:
2019 Oct. 05.92, 16.3, 0.7' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Oct. 02.92, 15.9, -- (P. Carson, Southend on Sea, Essex, UK, 0.315-m Cassegrain reflector)
2019 Oct. 02.88, 16.0, 1.4' (S. Fritsche, Köditz, 0.1-m refractor)

114P/Wiseman-Skiff
Total-magnitude and coma-diameter estimates:
2019 Oct. 13.99, 17.0, 0.5' (S. Fritsche, Koeditz, 0.1-m refractor)
2019 Oct. 10.22, 16.9, 0.3' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Oct. 10.22, 17.7, 0.3' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Oct. 10.07, 17.1, -- (P. Carson, Southend on Sea, Essex, UK, 0.315-m Cassegrain reflector)
2019 Oct. 07.22, 17.2, 0.4' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Oct. 02.97, 17.2, -- (P. Carson, Southend on Sea, Essex, UK, 0.315-m Cassegrain reflector)
2019 Oct. 01.03, 17.3, 0.3' (K. Hills, 0.5-m Newtonian reflector)

155P/Shoemaker
Total-magnitude and coma-diameter estimates:
2019 Oct. 12.24, 15.2, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2019 Oct. 05.21, 16.0, 0.5' (K. Hills, 0.5-m Newtonian reflector)

160P/LINEAR
Total-magnitude and coma-diameter estimates:
2019 Oct. 18.85, 14.7, 0.4' (K. Hills, 0.5-m Newtonian reflector)

174P/Echeclus
Total-magnitude and coma-diameter estimates:
2019 Oct. 10.19, 19.2, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Oct. 01.11, 19.0, 0.2' (K. Hills, 0.5-m Newtonian reflector)

200P/Larsen
Total-magnitude and coma-diameter estimates:
2019 Oct. 01.00, 19.7, 0.2' (K. Hills, 0.5-m Newtonian reflector)

223P/Skiff
Total-magnitude and coma-diameter estimates:
2019 Oct. 01.24, 20.1, 0.2' (K. Hills, 0.5-m Newtonian reflector)

260P/McNaught
Total-magnitude and coma-diameter estimates:
2019 Oct. 20.84, 11.5, 1.2' (P. Guzik, 0.326-m Newtonian reflector)
2019 Oct. 13.93, 12.0, 2.8' (S. Fritsche, Koeditz, 0.1-m refractor; 0.08-deg tail in p.a. 234)
2019 Oct. 10.03, 11.9, -- (P. Carson, Southend on Sea, Essex, UK, 0.315-m Cassegrain reflector)
2019 Oct. 08.98, 12.0, -- (P. Carson, Southend on Sea, Essex, UK, 0.315-m Cassegrain reflector)
2019 Oct. 08.26, 11.6, 1.4' (K. Hills, 0.5-m Newtonian reflector)
2019 Oct. 08.05, 11.7, 1.2' (P. Guzik, 0.326-m Newtonian reflector; 0.08-deg tail in p.a. 220)
2019 Oct. 07.97, 12.2, 1.3' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2019 Oct. 07.06, 11.7, 0.8' (C. Harder, Jeersdorf, h, 0.3-m Newtonian reflector; 3.0' tail in p.a. 240)
2019 Oct. 06.15, 12.3, 1.5' (J. Warell, 0.25-m Schmidt-Cassegrain; 6.7' tail in p.a. 237)
2019 Oct. 05.11, 12.3, 1.4' (M. Masek, 0.25-m Schmidt-Cassegrain; 11.3' tail in p.a. 239)
2019 Oct. 05.10, 12.6, 1.5' (M. Masek, 0.25-m Schmidt-Cassegrain; 8.6' tail in p.a. 235)
2019 Oct. 05.02, 11.7, 2' (C. Labordena, Atzeneta, 0.2-m Newtonian reflector)
2019 Oct. 04.97, 11.0, 2.5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Oct. 03.86, 12.1, 0.8' (C. Harder, Jeersdorf, f, 0.531-m Newtonian reflector; 1.5' tail in p.a. 220)
2019 Oct. 03.71, 12.8, 1.3' (C. Wyatt, 0.4-m Newtonian reflector; 2.0' tail in p.a. 230)
2019 Oct. 03.05, 11.9, 0.9' (C. Harder, Jeersdorf, f, 0.531-m Newtonian reflector; 5.0' tail in p.a. 240)
2019 Oct. 02.99, 11.9, 3.6' (S. Fritsche, Köditz, 0.1-m refractor; 0.11-deg tail in p.a. 241)
2019 Oct. 02.96, 11.9, -- (P. Carson, Southend on Sea, Essex, UK, 0.315-m Cassegrain reflector)
2019 Oct. 02.71, 12.5, 1.2' (C. Wyatt, 0.4-m Newtonian reflector; 2.7' tail in p.a. 230)
2019 Oct. 02.12, 12.1, 2.44' (N. James, 970, 0.28-m Schmidt-Cassegrain)
2019 Oct. 01.93, 12.1, 1.4' (M. Kwinta, Glanów, 0.25-m Newtonian reflector)
2019 Oct. 01.03, 11.7, 1.6' (K. Hills, 0.5-m Newtonian reflector)
2019 Sep. 30.95, 12.0, 1.4' (M. Kwinta, Glanów, 0.25-m Newtonian reflector)
2019 Sep. 29.49, 11.8, 4.5' (T. Lehmann, Mayhill (remote), 0.106-m refractor; 0.18-deg tail in p.a. 237)
2019 Sep. 29.04, 11.2, 2' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Sep. 28.95, 11.9, 1.5' (M. Kwinta, Glanów, 0.25-m Newtonian reflector)
2019 Sep. 27.89, 11.2, 1' (U. Pilz, 0.32-m Newtonian reflector)
2019 Sep. 26.94, 12.5, 0.94' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2019 Sep. 26.10, 12.9, 1.4' (M. Masek, 0.25-m Schmidt-Cassegrain; 10.7' tail in p.a. 242)
2019 Sep. 26.10, 12.4, 1.4' (M. Masek, 0.25-m Schmidt-Cassegrain; 11.2' tail in p.a. 239)
2019 Sep. 25.50, 11.7, 1.3' (S. Yoshida, 0.4-m Newtonian reflector)
2019 Sep. 24.57, 12.6, 0.8' (C. Wyatt, 0.4-m Newtonian reflector; 3.0' tail in p.a. 239)
2019 Sep. 24.13, 11.7, 1.8' (K. Hills, 0.5-m Newtonian reflector)
2019 Sep. 23.59, 12.2, 1' (C. Wyatt, 0.4-m Newtonian reflector; 4.0' tail in p.a. 238)
2019 Sep. 22.84, 12.3, 0.9' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector; 2.2' tail in p.a. 240)
2019 Sep. 22.05, 11.7, 6' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.58-deg tail in p.a. 243)

261P/Larson
Total-magnitude and coma-diameter estimates:
2019 Oct. 07.06, 15.4, 0.5' (K. Hills, 0.5-m Newtonian reflector)

289P/Blanpain
Total-magnitude and coma-diameter estimates:
2019 Sep. 27.96, 17.7, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2008 Y12 (SOHO)
Total-magnitude and coma-diameter estimates:
2019 Sep. 29.93, [ 9.5, 1' (M. Goiato, 20x100 binoculars)
2019 Sep. 23.93, [ 9.0, -- (A. Amorim, 0.09-m refractor)

C/2015 O1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Oct. 01.23, 16.6, 0.8' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Oct. 01.22, 16.7, 0.8' (M. Masek, 0.25-m Schmidt-Cassegrain)

C/2016 A1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Oct. 02.99, 18.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2016 M1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Oct. 04.25, 13.3, 0.6' (K. Hills, 0.5-m Newtonian reflector)

C/2016 R2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Sep. 26.87, 15.3, 0.3' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Sep. 26.87, 14.7, 0.4' (M. Masek, 0.25-m Schmidt-Cassegrain)

C/2017 B3 (LINEAR)
Total-magnitude and coma-diameter estimates:
2019 Oct. 19.50, 14.6, 0.5' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Oct. 18.42, 14.6, 0.9' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Oct. 03.68, 14.5, 1' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Oct. 02.69, 14.4, 1' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Oct. 01.42, 14.5, 0.9' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Sep. 24.55, 14.4, 0.9' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Sep. 23.54, 14.4, 0.6' (C. Wyatt, 0.4-m Newtonian reflector)

C/2017 K2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Oct. 13.79, 16.5, 1.3' (S. Fritsche, Koeditz, 0.1-m refractor)
2019 Oct. 02.80, 16.7, 1' (S. Fritsche, Köditz, 0.1-m refractor)
2019 Sep. 25.93, 16.2, 0.6' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Sep. 25.93, 16.6, 0.6' (M. Masek, 0.25-m Schmidt-Cassegrain)

C/2017 T2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Oct. 14.09, 12.4, 2.3' (S. Fritsche, Koeditz, 0.1-m refractor; 0.05-deg tail in p.a. 237)
2019 Oct. 10.12, 12.3, -- (P. Carson, Southend on Sea, Essex, UK, A140x315 binoculars)
2019 Oct. 10.11, 11.1, 1.7' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Oct. 08.12, 13.4, 0.56' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2019 Oct. 08.08, 11.7, 1.5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2019 Oct. 08.04, 12.1, 1.2' (P. Guzik, 0.326-m Newtonian reflector)
2019 Oct. 07.07, 11.5, 1.4' (C. Harder, Jeersdorf, h, 0.3-m Newtonian reflector)
2019 Oct. 06.15, 13.1, 1' (M. Masek, 0.25-m Schmidt-Cassegrain; 2.5' tail in p.a. 235)
2019 Oct. 06.15, 12.7, 1' (M. Masek, 0.25-m Schmidt-Cassegrain; 2.6' tail in p.a. 234)
2019 Oct. 05.09, 11.7, 1.2' (T. Karhula, Virsbo, Sweden, 0.305-m Newtonian reflector)
2019 Oct. 05.00, 9.6, 7' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Oct. 04.23, 12.1, 1.1' (K. Hills, 0.5-m Newtonian reflector)
2019 Oct. 03.68, 13.0, 0.8' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Oct. 03.11, 11.2, 1.7' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Oct. 03.08, 12.0, 1.5' (C. Harder, Jeersdorf, f, 0.531-m Newtonian reflector)
2019 Oct. 03.02, 12.8, 1.8' (S. Fritsche, Köditz, 0.1-m refractor; 0.05-deg tail in p.a. 241)
2019 Oct. 03.01, 12.3, -- (P. Carson, Southend on Sea, Essex, UK, 0.315-m Cassegrain reflector)
2019 Oct. 02.73, 12.9, 0.7' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Oct. 02.10, 10.6, 2.1' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Oct. 01.97, 11.7, 1.5' (M. Kwinta, Glanów, 0.25-m Newtonian reflector)
2019 Oct. 01.19, 12.9, 0.9' (M. Masek, 0.25-m Schmidt-Cassegrain; 4.1' tail in p.a. 232)
2019 Oct. 01.19, 13.3, 0.9' (M. Masek, 0.25-m Schmidt-Cassegrain; 2.9' tail in p.a. 238)
2019 Oct. 01.15, 12.3, 0.7' (W. Hasubick, 0.44-m Newtonian reflector)
2019 Oct. 01.00, 11.8, 1.5' (M. Kwinta, Glanów, 0.25-m Newtonian reflector)
2019 Sep. 30.18, 11.7, 2.1' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Sep. 29.06, 9.5, 6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Sep. 28.13, 11.4, 2.3' (U. Pilz, 0.32-m Newtonian reflector; 0.07-deg tail in p.a. 220)
2019 Sep. 28.07, 11.9, 1.7' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Sep. 27.14, 12.2, 1' (K. Hills, 0.5-m Newtonian reflector)
2019 Sep. 27.07, 11.6, 1.9' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Sep. 27.02, 12.9, 0.75' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2019 Sep. 26.17, 13.4, 0.9' (M. Masek, 0.25-m Schmidt-Cassegrain; 3.0' tail in p.a. 234)
2019 Sep. 26.16, 13.0, 0.9' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Sep. 23.12, 13.0, 1.9' (T. Lehmann, Weimar, 0.2-m Newtonian reflector; 0.06-deg tail in p.a. 244)

C/2018 A3 (ATLAS)
Total-magnitude and coma-diameter estimates:
2019 Oct. 08.25, 17.3, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Oct. 01.06, 16.7, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Sep. 24.16, 17.1, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2018 A6 (Gibbs)
Total-magnitude and coma-diameter estimates:
2019 Oct. 19.43, 14.0, 0.8' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Oct. 18.45, 14.3, 0.5' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Oct. 03.67, 13.6, 1' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Oct. 02.68, 13.7, 1' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Oct. 01.41, 14.1, 0.7' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Sep. 25.76, 13.3, 4.6' (T. Lehmann, SSO (remote), 0.106-m refractor)
2019 Sep. 24.55, 13.9, 1.2' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Sep. 23.58, 13.9, 0.5' (C. Wyatt, 0.4-m Newtonian reflector)

C/2018 L2 (ATLAS)
Total-magnitude and coma-diameter estimates:
2019 Oct. 01.09, 17.4, 0.3' (K. Hills, 0.5-m Newtonian reflector)

C/2018 N2 (ASASSN)
Total-magnitude and coma-diameter estimates:
2019 Oct. 20.83, 12.0, 1.5' (P. Guzik, 0.326-m Newtonian reflector)
2019 Oct. 19.87, 10.8, 2.3' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Oct. 19.81, 11.9, 1.69' (N. James, 970, 0.28-m Schmidt-Cassegrain)
2019 Oct. 19.53, 12.1, 1.1' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Oct. 18.90, 11.0, 1.9' (K. Hills, 0.5-m Newtonian reflector)
2019 Oct. 18.80, 11.4, 1.9' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Oct. 18.76, 11.0, 1.8' (C. Harder, Jeersdorf, Germany f, 0.3-m Newtonian reflector; 4.0' tail in p.a. 180)
2019 Oct. 18.43, 12.2, 1.2' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Oct. 13.89, 11.9, 3.3' (S. Fritsche, Koeditz, 0.1-m refractor)
2019 Oct. 10.09, 10.8, 2.3' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Oct. 10.05, 11.8, -- (P. Carson, Southend on Sea, Essex, UK, 0.315-m Cassegrain reflector)
2019 Oct. 08.96, 11.7, -- (P. Carson, Southend on Sea, Essex, UK, 0.315-m Cassegrain reflector)
2019 Oct. 08.06, 12.1, 1.2' (P. Guzik, 0.326-m Newtonian reflector)
2019 Oct. 07.93, 12.3, 1.31' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2019 Oct. 07.92, 11.2, 2.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Oct. 07.04, 11.4, 1.8' (C. Harder, Jeersdorf, h, 0.3-m Newtonian reflector; 2.0' tail in p.a. 180)
2019 Oct. 06.03, 12.2, 2' (J. Warell, 0.25-m Schmidt-Cassegrain; 10.0' tail in p.a. 177)
2019 Oct. 06.01, 12.0, 1' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 40x100 binoculars)
2019 Oct. 05.06, 11.9, 1.9' (M. Masek, 0.25-m Schmidt-Cassegrain; 9.8' tail in p.a. 178)
2019 Oct. 05.06, 12.3, 1.9' (M. Masek, 0.25-m Schmidt-Cassegrain; 7.1' tail in p.a. 178)
2019 Oct. 04.98, 11.6, 1.5' (C. Labordena, Atzeneta, 0.2-m Newtonian reflector)
2019 Oct. 03.85, 11.6, 1.2' (C. Harder, Jeersdorf, f, 0.531-m Newtonian reflector; 1.5' tail in p.a. 170)
2019 Oct. 03.70, 12.6, 1.3' (C. Wyatt, 0.4-m Newtonian reflector; 2.3' tail in p.a. 180)
2019 Oct. 03.07, 11.7, 1.3' (C. Harder, Jeersdorf, f, 0.531-m Newtonian reflector; 2.0' tail in p.a. 190)
2019 Oct. 02.96, 11.9, 4.9' (S. Fritsche, Köditz, 0.1-m refractor; 0.13-deg tail in p.a. 178)
2019 Oct. 02.95, 11.8, -- (P. Carson, Southend on Sea, Essex, UK, 0.315-m Cassegrain reflector)
2019 Oct. 02.70, 12.5, 1.3' (C. Wyatt, 0.4-m Newtonian reflector; 2.0' tail in p.a. 165)
2019 Oct. 02.14, 11.8, 2.44' (N. James, 970, 0.28-m Schmidt-Cassegrain)
2019 Oct. 01.92, 11.4, 1.4' (M. Kwinta, Glanów, 0.25-m Newtonian reflector)
2019 Sep. 30.97, 11.2, 1.9' (K. Hills, 0.5-m Newtonian reflector)
2019 Sep. 30.94, 11.4, 1.3' (M. Kwinta, Glanów, 0.25-m Newtonian reflector)
2019 Sep. 30.92, 12.5, 3.5' (S. Fritsche, Köditz, 0.1-m refractor; 0.14-deg tail in p.a. 180)
2019 Sep. 29.91, 12.0, 1.5' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2019 Sep. 29.47, 11.7, 7.1' (T. Lehmann, Mayhill (remote), 0.106-m refractor; 0.19-deg tail in p.a. 181)
2019 Sep. 29.21, [11.3, -- (S. Aguirre, Hermosillo, Sonora,Mex. , 0.15-m Schmidt-Cassegrain)
2019 Sep. 29.02, 10.8, 3' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Sep. 28.96, 11.5, 1.3' (M. Kwinta, Glanów, 0.25-m Newtonian reflector)
2019 Sep. 27.88, 12.4, 1.1' (U. Pilz, 0.32-m Newtonian reflector)
2019 Sep. 26.94, 12.0, 0.4' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2019 Sep. 26.06, 12.0, 1.8' (M. Masek, 0.25-m Schmidt-Cassegrain; 9.1' tail in p.a. 180)
2019 Sep. 26.05, 12.4, 1.9' (M. Masek, 0.25-m Schmidt-Cassegrain; 8.0' tail in p.a. 181)
2019 Sep. 25.49, 11.6, 1.7' (S. Yoshida, 0.4-m Newtonian reflector)
2019 Sep. 24.56, 12.5, 1' (C. Wyatt, 0.4-m Newtonian reflector; 4.8' tail in p.a. 192)
2019 Sep. 23.57, 12.6, 1.6' (C. Wyatt, 0.4-m Newtonian reflector; 3.7' tail in p.a. 193)
2019 Sep. 23.02, 11.3, 1.6' (K. Hills, 0.5-m Newtonian reflector)
2019 Sep. 22.86, 11.6, 1.5' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector; 2.2' tail in p.a. 180)

C/2018 U1 (Lemmon)
Total-magnitude and coma-diameter estimates:
2019 Oct. 16.86, 18.1, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Sep. 30.93, 18.0, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2018 W2 (Africano)
Total-magnitude and coma-diameter estimates:
2019 Oct. 21.33, 10.8, 2.5' (M. Linnolt, Volcano, Hawaii, 0.2-m Newtonian reflector; 3.0' tail in p.a. 30)
2019 Oct. 19.51, 10.6, 3.7' (C. Wyatt, 0.11-m Newtonian reflector)
2019 Oct. 17.86, 11.0, 2.9' (K. Hills, 0.5-m Newtonian reflector)
2019 Oct. 14.85, 9.9, 9.6' (S. Fritsche, Koeditz, 0.1-m refractor)
2019 Oct. 13.86, 10.6, 5.6' (S. Fritsche, Koeditz, 0.1-m refractor)
2019 Oct. 05.02, 8.7, 16' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Oct. 05.02, 10.2, 7.5' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Oct. 04.93, 9.2, 6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Oct. 04.91, 9.3, 6' (C. Labordena, Atzeneta, 0.15-m Newtonian reflector)
2019 Oct. 03.80, 8.8, 10' (G. Scheerle, 9x63 binoculars)
2019 Oct. 03.79, 9.0, 10' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2019 Oct. 03.01, 8.8, 7' (C. Harder, Jeersdorf, f, 0.195-m Newtonian reflector)
2019 Oct. 02.95, 8.7, 3' (W. Souza, 0.15-m Newtonian reflector)
2019 Oct. 02.90, 9.2, -- (P. Carson, Southend on Sea, Essex, UK, 0.315-m Cassegrain reflector)
2019 Oct. 02.90, 9.2, 8' (U. Pilz, 0.105-m refractor)
2019 Oct. 02.88, 8.4, 14' (G. Scheerle, 9x63 binoculars)
2019 Oct. 02.86, 9.3, 3.2' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Oct. 02.85, 8.7, 26' (S. Fritsche, Köditz, 0.1-m refractor; 0.24-deg tail in p.a. 18)
2019 Oct. 01.91, 9.0, 5' (M. Kwinta, Glanów, 0.25-m Newtonian reflector)
2019 Oct. 01.86, 8.7, 8' (T. Karhula, Virsbo, Sweden, 18x50 binoculars)
2019 Oct. 01.78, 8.7, 8' (P. Guzik, 10x50 binoculars)
2019 Oct. 01.56, 8.8, 6' (M. Mattiazzo, Swan Hill, Victoria, Australia, 25x100 binoculars)
2019 Oct. 01.43, 8.9, 8.5' (C. Wyatt, 11x70 binoculars)
2019 Oct. 01.11, 8.6, 15.5' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Oct. 01.10, 9.7, 8' (M. Masek, 0.25-m Schmidt-Cassegrain; 14.0' tail in p.a. 22)
2019 Sep. 30.99, 9.1, 8' (P. Guzik, 10x50 binoculars)
2019 Sep. 30.97, 8.7, 6' (M. Kwinta, Glanów, 0.25-m Newtonian reflector)
2019 Sep. 30.86, 8.7, 27' (S. Fritsche, Köditz, 0.1-m refractor; 0.37-deg tail in p.a. 13)
2019 Sep. 30.19, 8.4, 4' (C. Hergenrother, 30x125 binoculars)
2019 Sep. 30.15, [10.1, -- (S. Aguirre, Hermosillo, Sonora,Mex. , 0.15-m Schmidt-Cassegrain)
2019 Sep. 30.12, 8.4, 8' (M. Goiato, 20x100 binoculars)
2019 Sep. 29.87, 9.9, 4.1' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2019 Sep. 29.84, 8.8, 8' (P. Guzik, 10x50 binoculars)
2019 Sep. 29.83, 8.6, 18' (G. Scheerle, 9x63 binoculars)
2019 Sep. 29.03, 9.2, 9.5' (K. Hills, 0.5-m Newtonian reflector)
2019 Sep. 29.01, 8.7, 8' (M. Buechner, Kempten, 27x120 binoculars; 20.0' tail in p.a. 15)
2019 Sep. 28.96, 8.1, 6' (J. Gonzalez Suarez, 10x50 binoculars)
2019 Sep. 28.95, 8.3, 7' (J. Gonzalez Suarez, 25x100 binoculars; 0.3-deg tail in p.a. 20)
2019 Sep. 28.94, 8.5, 5' (M. Kwinta, Glanów, 0.25-m Newtonian reflector)
2019 Sep. 28.94, 8.6, 6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain; 0.2-deg tail in p.a. 20)
2019 Sep. 28.91, 8.7, 20' (S. Fritsche, Köditz, 0.1-m refractor; 0.25-deg tail in p.a. 17)
2019 Sep. 28.88, 9.0, 11' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2019 Sep. 28.88, 8.4, 14' (G. Scheerle, 9x63 binoculars)
2019 Sep. 28.15, 8.6, 17' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Sep. 28.15, 9.4, 9' (M. Masek, 0.25-m Schmidt-Cassegrain; 14.4' tail in p.a. 18)
2019 Sep. 28.01, 8.8, 7' (C. Labordena, La Serra, 0.15-m Newtonian reflector)
2019 Sep. 27.89, 9.7, 3.9' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Sep. 27.85, 10.0, 5' (U. Pilz, 0.32-m Newtonian reflector)
2019 Sep. 27.52, 8.7, 6' (M. Mattiazzo, Swan Hill, Victoria, Australia, 25x100 binoculars)
2019 Sep. 27.34, 9.0, 8' (M. Linnolt, Volcano, Hawaii, 0.41-m Newtonian reflector; 10.0' tail in p.a. 60)
2019 Sep. 27.18, 8.2, 31' (T. Lehmann, Mayhill (remote), 0.106-m refractor; 0.7-deg tail in p.a. 5)
2019 Sep. 27.12, 8.6, 6' (M. Goiato, 20x100 binoculars)
2019 Sep. 26.86, 9.8, 4.3' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain)
2019 Sep. 26.86, 9.5, 3.3' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Sep. 25.97, 8.4, 17' (M. Masek, 0.25-m Schmidt-Cassegrain; 14.4' tail in p.a. 17)
2019 Sep. 25.97, 9.2, 10' (M. Masek, 0.25-m Schmidt-Cassegrain; 14.1' tail in p.a. 15)
2019 Sep. 25.87, 10.0, 3.4' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Sep. 25.49, 9.2, 6.5' (S. Yoshida, 0.4-m Newtonian reflector)
2019 Sep. 24.93, 8.9, 7' (C. Labordena, La Serra, 0.15-m Newtonian reflector)
2019 Sep. 24.92, 9.8, 3.5' (V. Díaz, La Romana, Alicante, España, 0.127-m Newtonian reflector)
2019 Sep. 24.90, 8.7, 8' (P. Guzik, 10x50 binoculars)
2019 Sep. 24.90, 9.5, 4' (M. Paradowski, Piotrowice Wielkie, Poland, 10x60 binoculars)
2019 Sep. 24.54, 8.7, 13' (C. Wyatt, 7x50 binoculars)
2019 Sep. 24.16, 8.4, 6' (M. Goiato, 20x100 binoculars)
2019 Sep. 24.15, 8.5, 6' (M. Goiato, 0.22-m Newtonian reflector)
2019 Sep. 24.11, 10.0, 8.7' (K. Hills, 0.5-m Newtonian reflector)
2019 Sep. 23.91, 8.4, 10' (G. Scheerle, 9x63 binoculars)
2019 Sep. 23.91, 9.0, 10' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2019 Sep. 23.56, 9.5, 4.8' (C. Wyatt, 0.4-m Newtonian reflector)
2019 Sep. 23.50, 8.6, 6' (M. Mattiazzo, Swan Hill, Victoria, Australia, 25x100 binoculars)
2019 Sep. 22.87, 8.4, 10' (G. Scheerle, 9x63 binoculars)
2019 Sep. 22.82, 8.4, 8' (C. Harder, Jeersdorf, Germany f, 0.198-m Newtonian reflector)

C/2018 Y1 (Iwamoto)
Total-magnitude and coma-diameter estimates:
2019 Oct. 05.19, 18.5, 0.2' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Oct. 05.19, 18.2, 0.2' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Oct. 01.05, 17.1, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Sep. 24.06, 15.3, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2019 A9 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Sep. 22.78, 11.3, 8.5' (T. Lehmann, SSO (remote), 0.106-m refractor)

C/2019 D1 (Flewelling)
Total-magnitude and coma-diameter estimates:
2019 Sep. 30.98, 17.7, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Sep. 28.21, 18.0, 0.2' (M. Masek, 0.25-m Schmidt-Cassegrain; 0.2' tail in p.a. 216)
2019 Sep. 28.21, 18.5, 0.2' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Sep. 24.08, 17.1, 0.3' (K. Hills, 0.5-m Newtonian reflector)

C/2019 K4 (YE)
Total-magnitude and coma-diameter estimates:
2019 Sep. 30.96, 15.3, 0.6' (K. Hills, 0.5-m Newtonian reflector)
2019 Sep. 23.03, 15.1, 0.9' (K. Hills, 0.5-m Newtonian reflector)

C/2019 K5 (YOUNG)
Total-magnitude and coma-diameter estimates:
2019 Oct. 04.43, 15.3, 0.25' (G. van Buitenen, Auberry, CA (U69), 0.61-m Ritchey-Chretien)
2019 Oct. 01.08, 14.7, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2019 Sep. 24.15, 14.9, 0.5' (K. Hills, 0.5-m Newtonian reflector)

C/2019 K7 (SMITH)
Total-magnitude and coma-diameter estimates:
2019 Sep. 30.89, 16.4, 0.3' (K. Hills, 0.5-m Newtonian reflector)

C/2019 M3 (ATLAS)
Total-magnitude and coma-diameter estimates:
2019 Sep. 29.04, 19.2, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2019 N1 (ATLAS)
Total-magnitude and coma-diameter estimates:
2019 Oct. 14.80, 18.0, 1.1' (S. Fritsche, Koeditz, 0.1-m refractor)
2019 Oct. 07.83, 17.3, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Sep. 22.83, 17.6, 0.8' (T. Lehmann, Weimar, 0.2-m Newtonian reflector)

C/2019 Q4 (BORISOV)
Total-magnitude and coma-diameter estimates:
2019 Oct. 14.15, 16.7, 0.7' (S. Fritsche, Koeditz, 0.1-m refractor)
2019 Oct. 11.23, 16.4, 0.5' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Oct. 11.23, 16.4, 0.5' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Oct. 10.17, 17.2, -- (P. Carson, Southend on Sea, Essex, UK, 0.315-m Cassegrain reflector)
2019 Oct. 07.09, 16.8, 0.3' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Oct. 06.48, 16.4, 0.15' (G. van Buitenen, Mayhill, New Mexico (H06), 0.431-m Ritchey-Chretien)
2019 Oct. 05.23, 16.5, 0.5' (M. Masek, 0.25-m Schmidt-Cassegrain; 0.4' tail in p.a. 318)
2019 Oct. 02.22, 17.2, 0.5' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Oct. 02.17, 17.2, -- (P. Carson, Southend on Sea, Essex, UK, 0.315-m Cassegrain reflector)
2019 Sep. 29.22, 16.7, 0.5' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Sep. 26.21, 17.1, 0.4' (M. Masek, 0.25-m Schmidt-Cassegrain; 0.4' tail in p.a. 315)

P/2000 S4 (LINEAR-Spacewatch)
Total-magnitude and coma-diameter estimates:
2019 Sep. 27.98, 18.9, 0.2' (K. Hills, 0.5-m Newtonian reflector)

P/2006 F1 (Kowalski)
Total-magnitude and coma-diameter estimates:
2019 Oct. 07.04, 19.7, 0.2' (K. Hills, 0.5-m Newtonian reflector)

P/2010 U2 (Hill)
Total-magnitude and coma-diameter estimates:
2019 Oct. 08.23, 18.9, 0.2' (K. Hills, 0.5-m Newtonian reflector)

P/2014 U2 (Kowalski)
Total-magnitude and coma-diameter estimates:
2019 Oct. 04.21, 17.4, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Sep. 26.18, 15.8, 0.3' (K. Hills, 0.5-m Newtonian reflector)

P/2019 M2
Total-magnitude and coma-diameter estimates:
2019 Sep. 30.95, 19.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Sep. 24.14, 19.0, 0.2' (K. Hills, 0.5-m Newtonian reflector)