Recent Comet Brightness Estimates

29P/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates:
2019 May. 14.21, 11.6, 1.2' (N. Paul, Canary Island , Teide , MPC - G40, 0.5-m Schmidt-Cassegrain)
2019 May. 13.20, 11.8, 1' (N. Paul, Canary Island , Teide , MPC - G40, 0.5-m Schmidt-Cassegrain)
2019 May. 08.78, 13.7, 0.5' (C. Wyatt, 0.25-m Newtonian reflector)

38P/Stephan-Oterma
Total-magnitude and coma-diameter estimates:
2019 Apr. 30.94, 14.9, 2.2' (S. Fritsche, mlim=19.7, DSLR green, 0.1-m refractor; 0.12-deg tail in p.a. 272)
2019 Apr. 29.17, 14.4, 3.5' (T. Lehmann, mlim=18.6, CCD/G remote (Mayhill), 0.106-m refractor; 0.1-deg tail in p.a. 252)
2019 Apr. 27.93, 14.0, 0.2' (N. Paul, Canary Island , Teide , MPC - G40, 0.5-m Schmidt-Cassegrain)
2019 Apr. 22.14, 14.6, 2.1' (R. Ramlow, 0.106-m refractor; 6.9' tail in p.a. 265)

46P/Wirtanen
Total-magnitude and coma-diameter estimates:
2019 May. 06.19, 14.2, 5.1' (R. Ramlow, 0.106-m refractor)
2019 May. 01.95, 16.4, 1.1' (S. Fritsche, mlim=19.7, DSLR green, 0.1-m refractor)
2019 May. 01.15, 13.8, 6.4' (T. Lehmann, mlim=19.0, CCD/G remote (Mayhill), 0.106-m refractor; 0.17-deg tail in p.a. 278)
2019 Apr. 22.13, 13.6, 6' (R. Ramlow, 0.105-m refractor)
2019 Apr. 22.13, 13.4, 7.3' (T. Lehmann, mlim=18.7, CCD/G remote (Mayhill), 0.106-m refractor)

49P/Arend-Rigaux
Total-magnitude and coma-diameter estimates:
2019 May. 08.01, 18.3, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Apr. 30.98, 18.2, 0.2' (K. Hills, 0.5-m Newtonian reflector)

60P/Tsuchinshan
Total-magnitude and coma-diameter estimates:
2019 May. 07.91, 14.3, 0.6' (K. Hills, 0.5-m Newtonian reflector)
2019 Apr. 30.94, 14.2, 0.6' (K. Hills, 0.5-m Newtonian reflector)
2019 Apr. 30.90, 15.5, 1.4' (S. Fritsche, mlim=20.2, DSLR green, 0.1-m refractor; 0.13-deg tail in p.a. 295)
2019 Apr. 29.92, 13.9, 0.6' (J. Warell, 0.25-m Schmidt-Cassegrain; 4.0' tail in p.a. 298)
2019 Apr. 29.37, 15.2, 1.7' (T. Lehmann, mlim=19.5, CMOS green, remote (Bathurst), 0.28-m Newtonian reflector; 0.22-deg tail in p.a. 298)
2019 Apr. 24.98, 16.0, 0.8' (M. Masek, 0.25-m Schmidt-Cassegrain; 4.9' tail in p.a. 300)
2019 Apr. 24.97, 15.5, 0.8' (M. Masek, 0.25-m Schmidt-Cassegrain; 6.7' tail in p.a. 298)
2019 Apr. 22.90, 15.0, 1.8' (S. Fritsche, mlim=19.7, DSLR green, 0.1-m refractor; 0.11-deg tail in p.a. 298)
2019 Apr. 22.86, 15.2, 1.6' (T. Lehmann, mlim=19.9, DSLR green, 0.2-m Newtonian reflector; 0.32-deg tail in p.a. 298)

68P/Klemola
Total-magnitude and coma-diameter estimates:
2019 May. 14.46, 16.6, 0.11' (G. van Buitenen, Auberry, CA (U69), 0.61-m Ritchey-Chretien)
2019 May. 07.08, 17.3, 0.2' (H. Mikuz, 0.6-m Newtonian reflector)
2019 May. 01.19, 17.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Apr. 28.42, 17.2, 0.14' (G. van Buitenen, 09:59, 0.61-m Ritchey-Chretien)

74P/Smirnova-Chernykh
Total-magnitude and coma-diameter estimates:
2019 May. 08.03, 16.0, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2019 May. 01.09, 16.0, 0.4' (K. Hills, 0.5-m Newtonian reflector)

123P/West-Hartley
Total-magnitude and coma-diameter estimates:
2019 May. 07.90, 12.7, 1.2' (K. Hills, 0.5-m Newtonian reflector)
2019 May. 06.43, 13.4, 1.4' (C. Wyatt, 0.25-m Newtonian reflector)
2019 May. 06.15, 13.6, 4' (T. Lehmann, mlim=18.5, CCD/G remote (Mayhill), 0.106-m refractor)
2019 May. 04.02, 12.3, 2' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 May. 03.54, 13.4, 1.4' (S. Yoshida, 0.4-m Newtonian reflector)
2019 May. 02.50, 13.7, 1.1' (S. Yoshida, 0.4-m Newtonian reflector)
2019 Apr. 30.98, 13.7, 3.4' (S. Fritsche, mlim=20.1, DSLR green, 0.1-m refractor; 0.02-deg tail in p.a. 140)
2019 Apr. 30.95, 13.8, 0.7' (T. Karhula, Virsbo, Sweden, 0.305-m Newtonian reflector)
2019 Apr. 28.41, 13.9, 1' (C. Wyatt, 0.25-m Newtonian reflector)
2019 Apr. 28.30, 13.2, 6.3' (T. Lehmann, mlim=18.7, CCD/G remote (Mayhill), 0.106-m refractor)
2019 Apr. 26.02, 13.8, 2' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Apr. 26.01, 13.4, 2' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Apr. 25.89, 13.0, 1.8' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2019 Apr. 25.86, 13.0, 1.2' (P. Guzik, 0.326-m Newtonian reflector)
2019 Apr. 24.87, 13.5, 1.5' (M. Lehký, 0.3-m Schmidt-Cassegrain)
2019 Apr. 23.88, 14.1, 1' (A. Beck, 0.33-m Newtonian reflector)
2019 Apr. 22.95, 13.5, 4.1' (S. Fritsche, mlim=18.8, DSLR green, 0.1-m refractor)
2019 Apr. 22.89, 13.7, 1.1' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)

143P/Kowal-Mrkos
Total-magnitude and coma-diameter estimates:
2019 May. 08.22, 19.2, 0.2' (K. Hills, 0.5-m Newtonian reflector)

149P/Mueller
Total-magnitude and coma-diameter estimates:
2019 May. 08.02, 17.8, 0.4' (K. Hills, 0.5-m Newtonian reflector)

158P/Kowal-LINEAR
Total-magnitude and coma-diameter estimates:
2019 May. 09.08, 18.8, 0.2' (K. Hills, 0.5-m Newtonian reflector)

164P/Christensen
Total-magnitude and coma-diameter estimates:
2019 May. 07.88, 18.4, 0.3' (K. Hills, 0.5-m Newtonian reflector)

231P/LINEAR-NEAT
Total-magnitude and coma-diameter estimates:
2019 May. 07.92, 18.6, 0.2' (K. Hills, 0.5-m Newtonian reflector)

240P/NEAT
Total-magnitude and coma-diameter estimates:
2019 May. 07.89, 16.0, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2019 Apr. 25.97, 16.8, 0.5' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Apr. 25.97, 17.6, 0.4' (M. Masek, 0.25-m Schmidt-Cassegrain)

C/2010 U3 (Boattini)
Total-magnitude and coma-diameter estimates:
2019 May. 07.94, 14.7, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2019 Apr. 30.91, 15.3, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2019 Apr. 29.91, 15.3, 0.6' (J. Warell, 0.25-m Schmidt-Cassegrain; 1.1' tail in p.a. 260)
2019 Apr. 25.96, 15.4, 0.15' (J. Warell, 0.25-m Schmidt-Cassegrain)

C/2015 O1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 May. 01.91, 15.9, 1.2' (S. Fritsche, mlim=19.6, DSLR green, 0.1-m refractor)
2019 Apr. 29.90, 14.8, 0.8' (J. Warell, 0.25-m Schmidt-Cassegrain)

C/2016 A1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Apr. 25.92, 16.9, 0.15' (J. Warell, 0.25-m Schmidt-Cassegrain)

C/2016 M1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 May. 12.36, 12.6, 5' (T. Lehmann, mlim=18.4, CCD/G remote (SSO), moon 54% dist 83 deg, 0.106-m refractor; 0.16-deg tail in p.a. 179)
2019 May. 07.37, 12.7, 4.2' (R. Ramlow, 0.106-m refractor; 8.5' tail in p.a. 184)
2019 May. 06.41, 12.9, 1.5' (C. Wyatt, 0.25-m Newtonian reflector)
2019 May. 05.37, 12.2, 8' (T. Lehmann, mlim=19.4, CCD/G remote (SSO), 0.106-m refractor; 0.32-deg tail in p.a. 182)
2019 Apr. 28.39, 12.7, 1.3' (C. Wyatt, 0.25-m Newtonian reflector)

C/2016 N4 (MASTER)
Total-magnitude and coma-diameter estimates:
2019 May. 07.98, 17.6, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2019 Apr. 30.93, 17.0, 0.4' (K. Hills, 0.5-m Newtonian reflector)

C/2016 N6 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 May. 07.36, 14.2, 2.2' (T. Lehmann, mlim=19.3, CMOS green, remote (Bathurst), moon 7% dist 41 deg, 0.28-m Newtonian reflector; 0.06-deg tail in p.a. 44)

C/2016 R2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 May. 15.02, 15.2, 2.4' (T. Lehmann, mlim=20.4, DSLR green, moon 82% dist 57 deg, 0.2-m Newtonian reflector)
2019 May. 08.11, 13.8, 1' (K. Hills, 0.5-m Newtonian reflector)
2019 Apr. 22.98, 15.4, 1.4' (S. Fritsche, mlim=19.8, DSLR green, 0.1-m refractor)

C/2017 B3 (LINEAR)
Total-magnitude and coma-diameter estimates:
2019 May. 08.74, 14.4, 0.6' (C. Wyatt, 0.25-m Newtonian reflector)

C/2017 K2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 May. 13.01, 17.0, 0.8' (T. Lehmann, mlim=21.4, DSLR green, moon 61% dist 90 deg, 0.2-m Newtonian reflector)
2019 May. 12.44, 17.1, 0.5' (R. Ramlow, 0.61-m Newtonian reflector)
2019 May. 02.01, 17.2, 1.2' (S. Fritsche, mlim=21.0, DSLR green, 0.1-m refractor)
2019 Apr. 25.98, 16.2, 0.2' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Apr. 23.91, 17.6, -- (D. Swan, Tynemouth, UK, 0.2-m Schmidt-Cassegrain)
2019 Apr. 23.04, 16.8, 0.8' (S. Fritsche, mlim=19.2, DSLR green, 0.1-m refractor)

C/2017 M4 (ATLAS)
Total-magnitude and coma-diameter estimates:
2019 May. 08.50, 12.7, 2.6' (R. Ramlow, 0.106-m refractor; 2.7' tail in p.a. 13)
2019 May. 08.46, 12.8, 2' (C. Wyatt, 0.25-m Newtonian reflector)
2019 May. 08.05, 11.9, 1.3' (K. Hills, 0.5-m Newtonian reflector)
2019 May. 06.44, 13.2, 1.3' (C. Wyatt, 0.25-m Newtonian reflector)
2019 May. 05.75, 13.0, 3.6' (T. Lehmann, mlim=19.2, CCD/G remote (SSO), 0.106-m refractor; 0.12-deg tail in p.a. 5)
2019 Apr. 28.63, 13.0, 2.5' (T. Lehmann, mlim=19.4, CMOS green, remote (Bathurst), moon 34% dist 73 deg, 0.28-m Newtonian reflector; 0.04-deg tail in p.a. 3)

C/2018 A6 (Gibbs)
Total-magnitude and coma-diameter estimates:
2019 May. 08.46, 14.0, 0.7' (C. Wyatt, 0.25-m Newtonian reflector)
2019 May. 07.37, 13.5, 2.1' (R. Ramlow, 0.105-m refractor; 1.3' tail in p.a. 78)
2019 May. 07.37, 13.5, 2.2' (T. Lehmann, mlim=19.2, CMOS green, remote (Bathurst), moon 7% dist 80 deg, 0.28-m Newtonian reflector; 0.04-deg tail in p.a. 277)
2019 May. 06.42, 14.0, 0.7' (C. Wyatt, 0.25-m Newtonian reflector)
2019 Apr. 28.40, 14.0, 0.6' (C. Wyatt, 0.25-m Newtonian reflector)

C/2018 R3 (Lemmon)
Total-magnitude and coma-diameter estimates:
2019 May. 12.92, <13.6, -- (D. Swan, Tynemouth, UK, 0.2-m Schmidt-Cassegrain)

C/2018 W2 (Africano)
Total-magnitude and coma-diameter estimates:
2019 May. 14.89, 14.5, 1.9' (T. Lehmann, mlim=20.0, DSLR green, moon 81% dist 99 deg, 0.2-m Newtonian reflector; 0.02-deg tail in p.a. 44)
2019 May. 12.94, 15.7, -- (D. Swan, Tynemouth, UK, 0.2-m Schmidt-Cassegrain)
2019 May. 12.90, 14.2, 2.7' (T. Lehmann, mlim=20.8, DSLR green, moon 60% dist 81 deg, 0.2-m Newtonian reflector; 0.02-deg tail in p.a. 57)
2019 May. 05.14, 15.1, 1.3' (T. Lehmann, mlim=19.3, CCD/G remote (Mayhill), 0.51-m Newtonian reflector; 0.02-deg tail in p.a. 61)
2019 May. 01.86, 14.6, 1.8' (S. Fritsche, mlim=20.0, DSLR green, 0.1-m refractor; 0.01-deg tail in p.a. 31)
2019 Apr. 30.88, 15.0, 1.7' (S. Fritsche, mlim=19.2, DSLR green, 0.1-m refractor)
2019 Apr. 30.85, 14.6, 1.5' (S. Fritsche, mlim=19.2, DSLR green, 0.1-m refractor)
2019 Apr. 29.88, 15.4, 0.2' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Apr. 25.91, 14.8, 0.25' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Apr. 25.85, 14.2, 0.6' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2019 Apr. 25.14, 15.6, 0.8' (R. Ramlow, 0.106-m refractor)
2019 Apr. 23.88, 16.1, -- (D. Swan, Tynemouth, UK, 0.2-m Schmidt-Cassegrain)
2019 Apr. 22.85, 15.6, 0.9' (S. Fritsche, mlim=20.1, DSLR green, 0.1-m refractor; 0.01-deg tail in p.a. 55)

C/2018 Y1 (Iwamoto)
Total-magnitude and coma-diameter estimates:
2019 Apr. 24.89, 15.4, 0.5' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Apr. 24.89, 14.4, 1' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Apr. 24.85, 13.0, 2.5' (M. Lehký, 0.3-m Schmidt-Cassegrain)

C/2019 D1 (Flewelling)
Total-magnitude and coma-diameter estimates:
2019 May. 15.44, 13.0, 5.8' (T. Lehmann, mlim=19.1, CCD/G remote (Mayhill), 0.106-m refractor; 0.18-deg tail in p.a. 258)
2019 May. 09.43, 13.0, 6.1' (T. Lehmann, mlim=19.0, CCD/G remote (Mayhill), 0.106-m refractor; 0.17-deg tail in p.a. 256)
2019 May. 08.23, 14.3, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2019 May. 05.49, 15.3, 0.3' (G. van Buitenen, Auberry, CA (U69), 0.61-m Ritchey-Chretien; 60.0" tail in p.a. 260)
2019 May. 02.07, 14.7, 1.3' (S. Fritsche, mlim=18.7, DSLR green, 0.1-m refractor; 0.03-deg tail in p.a. 245)
2019 May. 01.07, 14.6, 1.2' (S. Fritsche, mlim=18.9, DSLR green, 0.1-m refractor)
2019 Apr. 23.08, 14.3, 1.2' (S. Fritsche, mlim=18.3, DSLR green, 0.1-m refractor)

C/2019 F1 (ATLAS-Africano)
Total-magnitude and coma-diameter estimates:
2019 May. 07.99, 17.8, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Apr. 30.99, 17.5, 0.3' (K. Hills, 0.5-m Newtonian reflector)