Recent Comet Brightness Estimates

29P/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates:
2019 Jul. 04.03, 12.8, 3.9' (S. Fritsche, mlim=19.0, DSLR green, 0.1-m refractor)
2019 Jul. 04.01, 13.1, 6.6' (M. Lostak, 0.2-m Newtonian reflector)
2019 Jun. 30.18, 12.9, 2.9' (N. Paul, Canary Island , Teide , MPC - G40, 0.5-m Schmidt-Cassegrain)
2019 Jun. 30.15, 12.1, 4' (K. Hills, 0.5-m Newtonian reflector)
2019 Jun. 29.16, 12.4, 3' (K. Hills, 0.5-m Newtonian reflector)

68P/Klemola
Total-magnitude and coma-diameter estimates:
2019 Jul. 06.23, 14.7, 0.5' (M. Masek, 0.3-m Cassegrain reflector)
2019 Jul. 06.23, 15.1, 0.5' (M. Masek, 0.3-m Cassegrain reflector)
2019 Jul. 03.98, 14.5, 2' (T. Lehmann, mlim=20.0, DSLR green, 0.2-m Newtonian reflector; 0.01-deg tail in p.a. 191)
2019 Jun. 30.17, 14.8, 0.9' (R. Ramlow, 0.106-m refractor)
2019 Jun. 29.93, 14.9, 4' (M. Lostak, 0.2-m Newtonian reflector)
2019 Jun. 28.94, 14.9, 1.3' (T. Lehmann, mlim=19.8, DSLR green, 0.2-m Newtonian reflector; 0.02-deg tail in p.a. 192)
2019 Jun. 26.47, 15.4, 0.41' (K. Yoshimoto, ,, 0.431-m Newtonian reflector; 0.4' tail in p.a. 230)
2019 Jun. 24.95, 15.1, 1.2' (T. Lehmann, mlim=19.6, DSLR green, 0.2-m Newtonian reflector; 0.02-deg tail in p.a. 205)
2019 Jun. 24.94, 15.2, 0.8' (S. Fritsche, mlim=20.8, DSLR green, 0.1-m refractor)
2019 Jun. 24.05, 14.6, 0.5' (K. Hills, 0.5-m Newtonian reflector)

74P/Smirnova-Chernykh
Total-magnitude and coma-diameter estimates:
2019 Jul. 06.18, 16.7, 0.3' (M. Masek, 0.3-m Cassegrain reflector)
2019 Jul. 06.18, 17.3, 0.3' (M. Masek, 0.3-m Cassegrain reflector)

215P/NEAT
Total-magnitude and coma-diameter estimates:
2019 Jun. 29.21, 17.2, 0.2' (K. Hills, 0.5-m Newtonian reflector)

260P/McNaught
Total-magnitude and coma-diameter estimates:
2019 Jul. 06.34, 15.6, 0.6' (M. Masek, 0.3-m Cassegrain reflector; 1.7' tail in p.a. 237)
2019 Jun. 30.81, 15.6, 0.4' (R. Ramlow, 0.32-m Ritchey-Chretien; 0.6' tail in p.a. 235)
2019 Jun. 30.19, 14.4, 0.8' (K. Hills, 0.5-m Newtonian reflector)

C/2016 R2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Jul. 03.91, 15.7, 1.6' (S. Fritsche, mlim=19.8, DSLR green, 0.1-m refractor)

C/2017 K2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Jun. 27.97, 16.7, 0.9' (T. Lehmann, mlim=20.7, DSLR green, 0.2-m Newtonian reflector)
2019 Jun. 27.93, 16.9, 1' (S. Fritsche, mlim=20.8, DSLR green, 0.1-m refractor)
2019 Jun. 27.03, 16.4, 0.5' (K. Hills, 0.5-m Newtonian reflector)

C/2017 M4 (ATLAS)
Total-magnitude and coma-diameter estimates:
2019 Jun. 28.43, 13.1, 3.9' (T. Lehmann, mlim=19.2, CCD/G remote (SSO), 0.106-m refractor; 0.05-deg tail in p.a. 47)

C/2017 T2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Jul. 23.82, 14.2, 0.34' (G. van Buitenen, Dordrecht, NL, 0.51-m Ritchey-Chretien)

C/2018 A6 (Gibbs)
Total-magnitude and coma-diameter estimates:
2019 Jul. 20.37, 14.2, 0.5' (C. Wyatt, 0.25-m Newtonian reflector)
2019 Jul. 05.99, 13.9, 0.6' (M. Masek, 0.3-m Cassegrain reflector)
2019 Jul. 05.99, 14.2, 0.7' (M. Masek, 0.3-m Cassegrain reflector)
2019 Jun. 30.36, 13.2, 3.9' (T. Lehmann, mlim=17.9, CCD/G remote (SSO), 0.106-m refractor; 0.03-deg tail in p.a. 117)

C/2018 N2 (ASASSN)
Total-magnitude and coma-diameter estimates:
2019 Jul. 10.82, 13.2, 0.7' (G. van Buitenen, Siding Spring Observatory (Q62), 0.431-m Ritchey-Chretien; 2.5' tail in p.a. 195)
2019 Jul. 06.43, 13.7, 0.8' (M. Masek, 0.3-m Cassegrain reflector)
2019 Jul. 06.42, 13.3, 0.8' (M. Masek, 0.3-m Cassegrain reflector; 1.8' tail in p.a. 192)
2019 Jul. 03.20, 13.0, 0.8' (N. Paul, Canary Island , Teide , MPC - G40, 0.5-m Schmidt-Cassegrain; 2.8' tail in p.a. 192)
2019 Jun. 30.81, 13.0, 1.4' (R. Ramlow, 0.106-m refractor; 1.8' tail in p.a. 201)
2019 Jun. 30.80, 13.2, 4.1' (T. Lehmann, mlim=18.2, CCD/G remote (SSO), moon 5% dist 33 deg, 0.106-m refractor; 0.06-deg tail in p.a. 193)

C/2018 R3 (Lemmon)
Total-magnitude and coma-diameter estimates:
2019 Jul. 05.92, 9.3, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Jul. 03.91, 10.9, 6.2' (T. Lehmann, mlim=17.8, DSLR green, 0.2-m Newtonian reflector)
2019 Jun. 29.89, 10.5, 3' (C. Labordena, Culla, 0.2-m Ritchey-Chretien)
2019 Jun. 28.91, 10.8, 6.8' (T. Lehmann, mlim=18.4, DSLR green, 0.2-m Newtonian reflector)
2019 Jun. 26.92, 9.5, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Jun. 24.91, 10.6, 5.9' (S. Fritsche, mlim=17.5, DSLR green, 0.1-m refractor)
2019 Jun. 24.91, 10.8, 6.2' (T. Lehmann, mlim=18.3, DSLR green, 0.2-m Newtonian reflector)

C/2018 U1 (Lemmon)
Total-magnitude and coma-diameter estimates:
2019 Jun. 25.17, 18.6, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2018 W1 (Catalina)
Total-magnitude and coma-diameter estimates:
2019 Jul. 20.36, 13.0, 0.8' (C. Wyatt, 0.25-m Newtonian reflector)

C/2018 W2 (Africano)
Total-magnitude and coma-diameter estimates:
2019 Jul. 10.02, 12.0, 1.3' (M. Meyer, 0.254-m Newtonian reflector)
2019 Jul. 06.10, 11.1, 4' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Jul. 04.03, 11.8, 6.9' (T. Lehmann, mlim=19.8, DSLR green, 0.2-m Newtonian reflector)
2019 Jul. 04.03, 11.7, 7.3' (M. Lostak, 0.2-m Newtonian reflector)
2019 Jul. 04.01, 11.6, 8.3' (S. Fritsche, mlim=19.2, DSLR green, 0.1-m refractor)
2019 Jul. 03.95, 12.2, 1.5' (P. Guzik, 0.326-m Newtonian reflector)
2019 Jun. 30.45, 13.2, 1.6' (K. Yoshimoto, ,, 0.431-m Newtonian reflector)
2019 Jun. 30.01, 12.8, 1.4' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2019 Jun. 29.20, 12.4, 0.59' (N. Paul, Canary Island , Teide , MPC - G40, 0.5-m Schmidt-Cassegrain)
2019 Jun. 29.01, 11.9, 6.7' (T. Lehmann, mlim=19.9, DSLR green, 0.2-m Newtonian reflector)
2019 Jun. 26.96, 12.7, 0.6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Jun. 25.20, 12.3, 0.57' (N. Paul, Canary Island , Teide , MPC - G40, 0.5-m Schmidt-Cassegrain)
2019 Jun. 24.97, 12.3, 4.9' (T. Lehmann, mlim=19.0, DSLR green, 0.2-m Newtonian reflector)

C/2019 D1 (Flewelling)
Total-magnitude and coma-diameter estimates:
2019 Jul. 04.00, 15.5, 1.5' (T. Lehmann, mlim=20.1, DSLR green, 0.2-m Newtonian reflector; 0.04-deg tail in p.a. 256)
2019 Jul. 03.97, 15.7, 1.1' (S. Fritsche, mlim=20.1, DSLR green, 0.1-m refractor; 0.02-deg tail in p.a. 248)
2019 Jun. 25.01, 14.4, 2.9' (T. Lehmann, mlim=20.0, DSLR green, moon 54% dist 45 deg, 0.2-m Newtonian reflector; 0.07-deg tail in p.a. 259)

C/2019 J2 (Palomar)
Total-magnitude and coma-diameter estimates:
2019 Jun. 25.02, 14.6, 2.2' (S. Fritsche, mlim=19.4, DSLR green, 0.1-m refractor; 0.01-deg tail in p.a. 223)