Recent Comet Brightness Estimates

29P/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates:
2019 Jun. 07.21, 13.0, 2.8' (K. Hills, 0.5-m Newtonian reflector)
2019 Jun. 03.22, 12.8, 1.5' (K. Hills, 0.5-m Newtonian reflector)
2019 Jun. 02.21, 12.8, 2.3' (K. Hills, 0.5-m Newtonian reflector)
2019 May. 31.11, 11.2, 2' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 May. 29.20, 12.5, 1' (N. Paul, Canary Island , Teide , MPC - G40, 0.5-m Schmidt-Cassegrain)
2019 May. 20.21, 12.2, 0.8' (N. Paul, Canary Island , Teide , MPC - G40, 0.43-m Schmidt-Cassegrain)

38P/Stephan-Oterma
Total-magnitude and coma-diameter estimates:
2019 Jun. 04.97, 16.1, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2019 May. 28.96, 14.9, 0.4' (K. Hills, 0.5-m Newtonian reflector)

46P/Wirtanen
Total-magnitude and coma-diameter estimates:
2019 Jun. 02.89, 16.0, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2019 May. 22.94, 16.1, 1.8' (T. Lehmann, mlim=19.6, DSLR green, 0.2-m Newtonian reflector)

49P/Arend-Rigaux
Total-magnitude and coma-diameter estimates:
2019 Jun. 01.95, 19.0, 0.2' (K. Hills, 0.5-m Newtonian reflector)

60P/Tsuchinshan
Total-magnitude and coma-diameter estimates:
2019 Jun. 01.94, 15.3, 0.6' (K. Hills, 0.5-m Newtonian reflector)

68P/Klemola
Total-magnitude and coma-diameter estimates:
2019 Jun. 12.30, 15.6, 0.4' (M. Masek, 0.3-m Cassegrain reflector)
2019 Jun. 12.30, 16.1, 0.4' (M. Masek, 0.3-m Cassegrain reflector)
2019 Jun. 06.02, 15.2, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2019 Jun. 05.98, 15.5, 1.3' (S. Fritsche, mlim=20.4, DSLR green, 0.1-m refractor; 0.01-deg tail in p.a. 234)
2019 Jun. 05.37, 15.7, 0.6' (R. Ramlow, 0.25-m Newtonian reflector)
2019 Jun. 04.99, 15.0, 0.5' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2019 Jun. 02.99, 15.6, 1.1' (S. Fritsche, mlim=19.4, DSLR green, 0.1-m refractor)
2019 May. 28.13, 15.6, 0.4' (K. Hills, 0.5-m Newtonian reflector)

74P/Smirnova-Chernykh
Total-magnitude and coma-diameter estimates:
2019 Jun. 07.94, 16.3, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2019 May. 31.99, 15.6, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2019 May. 25.03, 15.7, 0.4' (K. Hills, 0.5-m Newtonian reflector)

123P/West-Hartley
Total-magnitude and coma-diameter estimates:
2019 May. 29.93, 13.4, 1.2' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2019 May. 27.94, 13.1, 1.3' (K. Hills, 0.5-m Newtonian reflector)
2019 May. 22.90, 13.0, 1.2' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2019 May. 20.15, 14.1, 3.2' (T. Lehmann, mlim=16.6, CCD/G remote (Mayhill), moon 98% dist 91 deg, 0.106-m refractor)

149P/Mueller
Total-magnitude and coma-diameter estimates:
2019 Jun. 02.94, 18.9, 0.7' (S. Fritsche, mlim=20.9, DSLR green, 0.1-m refractor)
2019 Jun. 02.94, 17.4, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 May. 24.98, 18.6, 0.3' (K. Hills, 0.5-m Newtonian reflector)

158P/Kowal-LINEAR
Total-magnitude and coma-diameter estimates:
2019 Jun. 02.02, 18.3, 0.2' (K. Hills, 0.5-m Newtonian reflector)

231P/LINEAR-NEAT
Total-magnitude and coma-diameter estimates:
2019 May. 27.92, 18.7, 0.2' (K. Hills, 0.5-m Newtonian reflector)

240P/NEAT
Total-magnitude and coma-diameter estimates:
2019 May. 27.96, 15.4, 0.4' (K. Hills, 0.5-m Newtonian reflector)

260P/McNaught
Total-magnitude and coma-diameter estimates:
2019 Jun. 09.34, 16.9, 0.4' (M. Masek, 0.3-m Cassegrain reflector; 0.8' tail in p.a. 241)

264P/Larsen
Total-magnitude and coma-diameter estimates:
2019 May. 29.90, 19.6, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2010 U3 (Boattini)
Total-magnitude and coma-diameter estimates:
2019 Jun. 04.92, 15.0, 0.6' (K. Hills, 0.5-m Newtonian reflector)
2019 May. 24.99, 15.6, 0.8' (K. Hills, 0.5-m Newtonian reflector)
2019 May. 24.92, 17.1, 0.4' (J. Hadač, 0.13-m Newtonian reflector)

C/2015 V2 (Johnson)
Total-magnitude and coma-diameter estimates:
2019 Jun. 12.39, 16.9, 0.5' (M. Masek, 0.3-m Cassegrain reflector)

C/2016 M1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 May. 30.36, 13.4, 1.3' (C. Wyatt, 0.25-m Newtonian reflector)

C/2016 N4 (MASTER)
Total-magnitude and coma-diameter estimates:
2019 Jun. 02.98, 18.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 May. 25.02, 17.6, 0.4' (K. Hills, 0.5-m Newtonian reflector)

C/2016 R2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Jun. 08.89, 14.1, 0.9' (K. Hills, 0.5-m Newtonian reflector)
2019 Jun. 05.94, 15.2, 2.6' (S. Fritsche, mlim=20.2, DSLR green, 0.1-m refractor)
2019 Jun. 02.00, 13.6, 1' (K. Hills, 0.5-m Newtonian reflector)
2019 May. 25.99, 16.9, 0.3' (J. Hadač, 0.13-m Newtonian reflector)
2019 May. 25.87, 15.4, 0.9' (A. Novichonok, ISON-Kitab observatory, 0.36-m Ritchey-Chretien)
2019 May. 24.13, 14.0, 0.9' (K. Hills, 0.5-m Newtonian reflector)

C/2017 B3 (LINEAR)
Total-magnitude and coma-diameter estimates:
2019 Jun. 10.37, 14.8, 0.7' (M. Masek, 0.3-m Cassegrain reflector)
2019 Jun. 10.37, 14.4, 0.7' (M. Masek, 0.3-m Cassegrain reflector; 0.7' tail in p.a. 219)

C/2017 K2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Jun. 07.00, 16.0, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2019 May. 23.00, 16.8, 1.1' (T. Lehmann, mlim=20.4, DSLR green, moon 83% dist 83 deg, 0.2-m Newtonian reflector; 0.01-deg tail in p.a. 309)

C/2017 M4 (ATLAS)
Total-magnitude and coma-diameter estimates:
2019 May. 30.38, 13.5, 0.9' (C. Wyatt, 0.25-m Newtonian reflector)
2019 May. 27.03, 11.2, 1.2' (K. Hills, 0.5-m Newtonian reflector)
2019 May. 25.42, 12.8, 4.4' (T. Lehmann, mlim=19.5, CCD/G remote (SSO), 0.106-m refractor; 0.06-deg tail in p.a. 29)

C/2018 A6 (Gibbs)
Total-magnitude and coma-diameter estimates:
2019 May. 30.37, 14.0, 0.7' (C. Wyatt, 0.25-m Newtonian reflector)
2019 May. 30.36, 13.2, 3.5' (T. Lehmann, mlim=19.0, CCD/G remote (SSO), 0.106-m refractor; 0.04-deg tail in p.a. 123)

C/2018 N2 (ASASSN)
Total-magnitude and coma-diameter estimates:
2019 Jun. 12.20, 13.1, 0.3' (N. Paul, Canary Island , Teide , MPC - G40, 0.5-m Schmidt-Cassegrain; 2.6' tail in p.a. 186)

C/2018 R3 (Lemmon)
Total-magnitude and coma-diameter estimates:
2019 Jun. 11.89, 10.3, 4' (C. Labordena, La Serra, 0.2-m Schmidt-Cassegrain)
2019 Jun. 07.94, 8.5, 10' (J. Gonzalez Suarez, 25x100 binoculars)
2019 Jun. 07.93, 9.3, 6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Jun. 05.90, 10.2, 3' (P. Guzik, 25x100 binoculars)
2019 Jun. 05.90, 10.4, 9' (S. Fritsche, mlim=18.6, DSLR green, 0.1-m refractor)
2019 Jun. 05.02, 8.9, 2.5' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Jun. 03.89, 10.3, 3' (C. Harder, Ustrine, Cres, Croatia, 0.531-m Newtonian reflector)
2019 Jun. 03.85, 10.8, 3.5' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2019 Jun. 02.89, 10.4, 4' (C. Harder, Ustrine, Cres, Croatia, 0.531-m Newtonian reflector)
2019 Jun. 02.89, 10.5, 7.9' (S. Fritsche, mlim=17.9, DSLR green, 0.1-m refractor)
2019 Jun. 01.97, 10.2, 5.3' (M. Paradowski, Dąbrowa, Poland, 0.034-m reflector; 0.07-deg tail in p.a. 10)
2019 Jun. 01.94, 10.5, 2.8' (C. Harder, Ustrine, Cres, Croatia, 0.531-m Newtonian reflector)
2019 May. 31.95, 10.9, 2.5' (P. Guzik, 0.326-m Newtonian reflector)
2019 May. 31.89, 10.2, 2.5' (C. Harder, Ustrine, Cres, Croatia, 0.531-m Newtonian reflector)
2019 May. 30.93, 10.1, 4' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 May. 30.86, 10.0, 3.6' (C. Harder, Ustrine, Cres, Croatia, 0.531-m Newtonian reflector)
2019 May. 27.00, 11.6, 3' (D. Swan, Tynemouth, UK, 0.2-m Schmidt-Cassegrain)
2019 May. 24.85, 11.6, 1.8' (S. Szabo, Fertoszentmiklos, 0.5-m Newtonian reflector)

C/2018 U1 (Lemmon)
Total-magnitude and coma-diameter estimates:
2019 Jun. 08.01, 18.4, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2018 W1 (Catalina)
Total-magnitude and coma-diameter estimates:
2019 May. 31.35, 11.2, 4.5' (C. Wyatt, 0.25-m Newtonian reflector)
2019 May. 30.36, 11.5, 2' (M. Mattiazzo, Swan Hill, Victoria, Australia, 0.2-m Newtonian reflector)
2019 May. 30.36, 11.4, 3.5' (C. Wyatt, 0.25-m Newtonian reflector)
2019 May. 28.34, 11.2, 2.4' (C. Wyatt, 0.25-m Newtonian reflector)
2019 May. 27.36, 11.6, 2' (M. Mattiazzo, Swan Hill, Victoria, Australia, 0.2-m Newtonian reflector)

C/2018 W2 (Africano)
Total-magnitude and coma-diameter estimates:
2019 Jun. 03.90, 14.1, 0.4' (C. Harder, Ustrine, Cres, Croatia, 0.531-m Newtonian reflector)
2019 Jun. 02.94, 13.9, 0.4' (C. Harder, Ustrine, Cres, Croatia, 0.531-m Newtonian reflector)
2019 May. 31.96, 13.6, 1' (P. Guzik, 0.326-m Newtonian reflector)
2019 May. 31.90, 14.2, 0.35' (C. Harder, Ustrine, Cres, Croatia, 0.531-m Newtonian reflector)
2019 May. 30.88, 14.1, 0.5' (C. Harder, Ustrine, Cres, Croatia, 0.531-m Newtonian reflector)
2019 May. 24.87, 14.7, 0.3' (S. Szabo, Fertoszentmiklos, 0.5-m Newtonian reflector)
2019 May. 22.90, 13.4, 3.7' (T. Lehmann, mlim=19.5, DSLR green, 0.2-m Newtonian reflector; 0.02-deg tail in p.a. 43)
2019 May. 22.89, 13.8, 0.6' (G. Scheerle, 0.235-m Schmidt-Cassegrain)

C/2019 D1 (Flewelling)
Total-magnitude and coma-diameter estimates:
2019 Jun. 06.02, 14.4, 2.2' (S. Fritsche, mlim=19.7, DSLR green, 0.1-m refractor; 0.04-deg tail in p.a. 254)
2019 Jun. 05.02, 14.8, 0.5' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2019 Jun. 05.00, 15.0, 0.3' (C. Harder, Ustrine, Cres, Croatia, 0.531-m Newtonian reflector)
2019 May. 31.97, 13.5, 0.6' (P. Guzik, 0.326-m Newtonian reflector)
2019 May. 31.10, 13.2, 0.5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 May. 23.43, 13.1, 6.2' (T. Lehmann, mlim=18.2, CCD/G remote (Mayhill), moon 79% dist 64 deg, 0.106-m refractor; 0.21-deg tail in p.a. 260)

C/2019 F1 (ATLAS-Africano)
Total-magnitude and coma-diameter estimates:
2019 May. 31.98, 17.8, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2019 May. 24.97, 17.7, 0.3' (K. Hills, 0.5-m Newtonian reflector)

C/2019 J2 (Palomar)
Total-magnitude and coma-diameter estimates:
2019 Jun. 03.03, 14.8, 2.1' (S. Fritsche, mlim=20.0, DSLR green, 0.1-m refractor)