Recent Comet Brightness Estimates

21P/Giacobini-Zinner
Total-magnitude and coma-diameter estimates:
2018 Jul. 18.18, 9.4, 9.2' (R. Ramlow, 0.106-m refractor; 8.8' tail in p.a. 232)
2018 Jul. 17.99, 9.9, 3' (M. Meyer, 0.254-m Newtonian reflector)
2018 Jul. 17.82, 10.0, 1.5' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jul. 17.02, 9.5, 2.9' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain; 1.9' tail in p.a. 233)
2018 Jul. 16.99, 9.9, 4' (M. Meyer, 0.254-m Newtonian reflector)
2018 Jul. 16.96, 10.5, 1.3' (C. Harder, Jeersdorf, Germany, 0.402-m Newtonian reflector; 2.5' tail in p.a. 220)
2018 Jul. 16.81, 10.0, 2' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jul. 16.03, 10.5, 7' (D. Bamberger, 0.254-m Ritchey-Chretien; 7.7' tail in p.a. 248)
2018 Jul. 16.01, 10.5, 3' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2018 Jul. 16.01, 10.3, 5.83' (N. James, 0.28-m Schmidt-Cassegrain)
2018 Jul. 15.94, 11.0, 1.5' (C. Harder, Jeersdorf, Germany, 0.402-m Newtonian reflector; 4.0' tail in p.a. 230)
2018 Jul. 15.01, 10.2, 2.7' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain; 2.2' tail in p.a. 246)
2018 Jul. 14.99, 9.8, 2.8' (M. Meyer, 0.254-m Newtonian reflector)
2018 Jul. 14.94, 10.9, 3.1' (J. Cerny, 0.355-m Newtonian reflector; 7.2' tail in p.a. 248)
2018 Jul. 14.94, 10.2, 2.5' (C. Harder, Jeersdorf, Germany, 0.402-m Newtonian reflector; 2.8' tail in p.a. 240)
2018 Jul. 14.00, 9.9, 2.8' (G. van Buitenen, Dordrecht, Netherlands, 0.305-m Newtonian reflector)
2018 Jul. 13.98, 10.0, 2.8' (M. Meyer, 0.12-m refractor)
2018 Jul. 13.97, 10.1, 2.4' (M. Meyer, 0.254-m Newtonian reflector)
2018 Jul. 13.95, 10.4, 0.9' (S. Szabo, Csapod, 0.6-m Newtonian reflector; 3.5' tail in p.a. 325)
2018 Jul. 13.50, 10.0, 4' (S. Yoshida, 0.4-m Newtonian reflector)
2018 Jul. 13.13, 10.3, 2' (N. Paul, Slooh, Canary Island (MPC - G40), 0.43-m Schmidt-Cassegrain)
2018 Jul. 13.04, 10.2, 2.8' (G. van Buitenen, Dordrecht, Netherlands, 0.13-m Newtonian reflector)
2018 Jul. 11.96, 10.0, 2.7' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain; 2.7' tail in p.a. 235)
2018 Jul. 10.73, 10.5, 2.5' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jul. 09.97, 10.3, 3.5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2018 Jul. 09.95, 9.9, 4' (P. Guzik, 10x50 binoculars)
2018 Jul. 09.94, 10.1, 3.5' (P. Guzik, 0.326-m Newtonian reflector)
2018 Jul. 09.94, 10.3, 2' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2018 Jul. 09.10, 9.9, 1.8' (W. Kutschera, 0.25-m Newtonian reflector; 0.04-deg tail)
2018 Jul. 08.92, 10.1, 2.7' (C. Harder, Jeersdorf, Germany, 0.252-m Newtonian reflector)
2018 Jul. 08.77, 11.0, 2.1' (Y. Chen, wuchuan, 0.15-m Newtonian reflector; 3.5' tail in p.a. 230)
2018 Jul. 07.99, 10.3, 2' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2018 Jul. 07.98, 9.9, 2.3' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2018 Jul. 07.95, 9.9, 2.8' (C. Harder, Jeersdorf, Germany, 0.252-m Newtonian reflector)
2018 Jul. 07.94, 10.1, 4' (U. Pilz, 0.32-m Newtonian reflector)
2018 Jul. 07.13, 10.4, 2.4' (K. Hills, 0.5-m Newtonian reflector)
2018 Jul. 07.02, 10.2, 3.5' (C. Labordena, Culla, 0.2-m Schmidt-Cassegrain)
2018 Jul. 06.97, 10.2, 3.5' (C. Labordena, Culla, 0.2-m Schmidt-Cassegrain)
2018 Jul. 06.93, 10.2, 11' (T. Lehmann, 0.075-m reflector; 0.05-deg tail in p.a. 229)
2018 Jul. 06.04, 11.6, 2.7' (D. Bamberger, 0.254-m Ritchey-Chretien; 3.6' tail in p.a. 240)
2018 Jul. 06.00, 10.7, 2.2' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2018 Jul. 05.95, 10.4, 3' (C. Labordena, Culla, 0.2-m Schmidt-Cassegrain)
2018 Jul. 05.02, 10.5, 2.4' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2018 Jul. 04.94, 10.4, 2' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2018 Jul. 03.97, 10.2, 3.5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2018 Jul. 03.97, 10.5, 9.4' (S. Fritsche, 0.1-m refractor; 0.04-deg tail in p.a. 226)
2018 Jul. 03.90, 11.0, 3' (P. Guzik, 0.326-m Newtonian reflector)
2018 Jul. 03.90, 10.6, 2' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2018 Jul. 02.99, 10.9, 2.2' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2018 Jul. 02.93, 10.9, 5.3' (J. Cerny, 0.355-m Newtonian reflector)
2018 Jul. 02.13, 11.5, 1.16' (N. Paul, Slooh, Canary Island (MPC - G40), 0.43-m Schmidt-Cassegrain)
2018 Jul. 01.99, 10.8, 8.4' (S. Fritsche, 0.1-m refractor; 0.03-deg tail in p.a. 234)
2018 Jul. 01.36, 10.6, 9.5' (T. Lehmann, 0.106-m refractor; 0.06-deg tail in p.a. 237)
2018 Jul. 01.30, 11.0, 5' (R. Ramlow, 0.106-m refractor; 4.4' tail in p.a. 235)
2018 Jul. 01.00, 11.7, 3.5' (D. Bamberger, Daniel Bamberger, 0.254-m Ritchey-Chretien; 4.1' tail in p.a. 240)
2018 Jun. 30.94, 11.7, 2.63' (N. James, 0.28-m Schmidt-Cassegrain)
2018 Jun. 28.93, 11.9, 1.69' (N. James, 0.28-m Schmidt-Cassegrain)
2018 Jun. 26.43, 10.6, 12' (T. Lehmann, 0.106-m refractor; 0.07-deg tail in p.a. 225)
2018 Jun. 26.00, 12.2, 2.26' (N. James, 0.28-m Schmidt-Cassegrain)
2018 Jun. 24.97, 12.2, 3.5' (D. Bamberger, 0.254-m Ritchey-Chretien; 2.2' tail in p.a. 238)
2018 Jun. 24.81, 12.0, 2' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jun. 24.15, 11.9, 1.3' (K. Hills, 0.5-m Newtonian reflector)
2018 Jun. 23.77, 12.1, 2' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jun. 23.73, 12.2, 1.5' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jun. 22.73, 12.3, 1' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jun. 21.76, 12.2, 1.5' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jun. 20.96, 11.8, 6.2' (T. Lehmann, 0.075-m reflector; 0.05-deg tail in p.a. 235)
2018 Jun. 20.06, 12.8, 2.5' (D. Bamberger, 0.254-m Ritchey-Chretien; 2.4' tail in p.a. 240)
2018 Jun. 19.78, 12.4, 2' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jun. 19.27, 11.7, 3.2' (R. Ramlow, 0.106-m refractor; 2.9' tail in p.a. 242)
2018 Jun. 19.11, 12.4, 1' (N. Paul, Slooh, Canary Island (MPC - G40), 0.43-m Ritchey-Chretien)
2018 Jun. 19.01, 12.9, 1.9' (S. Fritsche, 0.1-m refractor; 0.02-deg tail in p.a. 239)
2018 Jun. 18.95, 11.5, 6.8' (T. Lehmann, 0.068-m reflector; 0.05-deg tail in p.a. 246)

29P/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates:
2018 Jul. 16.80, [15.4, -- (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jul. 16.74, [14.9, -- (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 14.03, 15.0, 0.7' (S. Szabo, Csapod, 0.6-m Newtonian reflector)
2018 Jul. 13.73, [14.9, -- (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 13.71, [13.5, 0.8' (S. Yoshida, 0.4-m Newtonian reflector)
2018 Jul. 12.05, 14.3, 1.4' (D. Bamberger, 0.254-m Ritchey-Chretien)
2018 Jul. 11.74, [14.2, -- (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 10.75, [15.8, -- (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jul. 09.99, [14.0, 0.5' (P. Guzik, 0.326-m Newtonian reflector)
2018 Jul. 09.63, [14.9, -- (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 09.06, 14.2, 0.7' (W. Kutschera, 0.54-m Newtonian reflector)
2018 Jul. 08.78, [14.6, -- (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jul. 07.06, 12.8, 1.5' (K. Hills, 0.5-m Newtonian reflector)
2018 Jun. 28.13, 13.8, 0.8' (K. Hills, 0.5-m Newtonian reflector)
2018 Jun. 24.77, [15.3, -- (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jun. 24.16, 14.0, 0.8' (K. Hills, 0.5-m Newtonian reflector)
2018 Jun. 23.77, 15.1, -- (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jun. 22.78, [15.1, -- (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jun. 21.79, [15.1, -- (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jun. 19.81, [14.9, -- (P. Camilleri, Katherine NT Australia, 0.406-m Newtonian reflector)
2018 Jun. 18.31, 17.5, 0.2' (M. Masek, 0.3-m Schmidt-Cassegrain)

30P/Reinmuth
Total-magnitude and coma-diameter estimates:
2018 Jun. 18.02, 19.4, 0.2' (M. Masek, 0.3-m Schmidt-Cassegrain)

37P/Forbes
Total-magnitude and coma-diameter estimates:
2018 Jul. 17.80, 13.6, 1' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jul. 16.79, 13.4, 1.5' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jul. 16.74, 13.0, 1.3' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 14.01, 13.8, 1.3' (S. Szabo, Csapod, 0.6-m Newtonian reflector)
2018 Jul. 13.74, 12.9, 1.6' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 13.68, 13.5, 1' (S. Yoshida, 0.4-m Newtonian reflector)
2018 Jul. 11.75, 13.5, 1.3' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 10.76, 13.6, 1' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jul. 10.07, 10.6, 4' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2018 Jul. 09.97, 13.0, 1.2' (P. Guzik, 0.326-m Newtonian reflector)
2018 Jul. 08.77, 13.7, 1.2' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jul. 02.17, 13.2, 0.75' (N. Paul, Slooh, Canary Island (MPC - G40), 0.43-m Schmidt-Cassegrain)
2018 Jun. 26.42, 11.9, 7.7' (T. Lehmann, 0.106-m refractor; 0.22-deg tail in p.a. 244)
2018 Jun. 24.79, 13.2, 2' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jun. 23.79, 13.5, 1.5' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jun. 23.76, 12.1, 1.5' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jun. 22.77, 13.3, 1.7' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jun. 21.78, 13.6, 1' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jun. 19.80, 13.0, 2' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jun. 19.42, 12.0, 6.5' (T. Lehmann, 0.106-m refractor; 0.35-deg tail in p.a. 242)
2018 Jun. 19.11, 10.3, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)

38P/Stephan-Oterma
Total-magnitude and coma-diameter estimates:
2018 Jun. 18.42, 16.4, 0.3' (M. Masek, 0.3-m Schmidt-Cassegrain)

48P/Johnson
Total-magnitude and coma-diameter estimates:
2018 Jul. 17.79, 13.1, 1.5' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jul. 16.82, 12.5, 1.5' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jul. 16.72, 13.3, 1.3' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 14.00, 13.7, 0.6' (S. Szabo, Csapod, 0.6-m Newtonian reflector)
2018 Jul. 13.72, 13.0, 1' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 13.69, 13.3, 0.5' (S. Yoshida, 0.4-m Newtonian reflector)
2018 Jul. 12.49, 12.7, 1.2' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 11.74, 13.5, 1.2' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 10.72, 12.4, 1' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jul. 09.98, 12.6, 1.2' (P. Guzik, 0.326-m Newtonian reflector)
2018 Jul. 08.14, 12.7, 1.1' (K. Hills, 0.5-m Newtonian reflector)
2018 Jul. 06.65, 13.2, 1.5' (R. Ramlow, 0.106-m refractor; 3.4' tail in p.a. 260)
2018 Jun. 23.76, 14.0, 1.5' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jun. 23.75, 14.1, 0.7' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jun. 23.66, 13.9, 1' (R. Ramlow, 0.106-m refractor; 1.3' tail in p.a. 258)
2018 Jun. 22.76, 14.0, 1' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jun. 21.73, 14.0, 1.5' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jun. 19.09, 11.5, 4' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)

65P/Gunn
Total-magnitude and coma-diameter estimates:
2018 Jul. 08.20, 16.3, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2018 Jun. 18.27, 17.5, 0.2' (M. Masek, 0.3-m Schmidt-Cassegrain)

66P/du Toit
Total-magnitude and coma-diameter estimates:
2018 Jul. 17.81, 12.4, 2' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jul. 16.77, 12.8, 2' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jul. 11.76, 12.3, 2.3' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 10.78, 12.5, 2' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jul. 10.12, 9.7, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2018 Jul. 09.71, 11.4, 13' (T. Lehmann, 0.106-m refractor)
2018 Jul. 09.66, 12.7, 2.1' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 08.80, 11.5, 2' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jun. 24.80, 11.5, 3.5' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jun. 23.78, 11.4, 3' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jun. 23.75, 11.1, 7' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jun. 22.76, 11.1, 5.1' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jun. 21.75, 11.2, 4' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jun. 19.79, 11.2, 4' (P. Camilleri, 0.406-m Newtonian reflector)

143P/Kowal-Mrkos
Total-magnitude and coma-diameter estimates:
2018 Jul. 06.92, 17.9, 0.2' (K. Hills, 0.5-m Newtonian reflector)

187P/LINEAR
Total-magnitude and coma-diameter estimates:
2018 Jul. 01.91, 19.1, 0.2' (K. Hills, 0.5-m Newtonian reflector)

364P/PANSTARRS
Total-magnitude and coma-diameter estimates:
2018 Jul. 16.78, 11.5, 0.7' (C. Wyatt, 0.25-m Newtonian reflector; 4.6' tail in p.a. 198)
2018 Jul. 13.80, 11.1, 1' (C. Wyatt, 0.25-m Newtonian reflector; 4.4' tail in p.a. 186)
2018 Jul. 09.34, 11.3, 0.8' (C. Wyatt, 0.25-m Newtonian reflector; 3.0' tail in p.a. 166)
2018 Jul. 08.36, 11.0, 1.2' (C. Wyatt, 0.25-m Newtonian reflector; 3.6' tail in p.a. 152)
2018 Jul. 04.34, 11.3, 1' (C. Wyatt, 0.25-m Newtonian reflector; 7.0' tail in p.a. 151)
2018 Jul. 02.36, 10.8, 2.2' (R. Ramlow, 0.106-m refractor; 22.0' tail in p.a. 135)
2018 Jul. 01.96, 11.0, 1.8' (M. Masek, 0.3-m Schmidt-Cassegrain; 12.0' tail in p.a. 139)
2018 Jun. 23.35, 11.9, 1.4' (C. Wyatt, 0.25-m Newtonian reflector; 2.7' tail in p.a. 89)
2018 Jun. 22.35, 11.5, 2' (R. Ramlow, 0.106-m refractor; 10.4' tail in p.a. 115)
2018 Jun. 22.35, 11.9, 0.9' (C. Wyatt, 0.25-m Newtonian reflector; 2.2' tail in p.a. 118)

C/2015 O1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2018 Jul. 13.89, 13.5, 1.3' (S. Szabo, Csapod, 0.6-m Newtonian reflector)
2018 Jul. 13.49, 12.8, 1' (S. Yoshida, 0.4-m Newtonian reflector)
2018 Jul. 07.92, 14.2, 2.4' (T. Lehmann, 0.075-m reflector; 0.09-deg tail in p.a. 82)
2018 Jul. 01.93, 14.0, 3.3' (S. Fritsche, 0.1-m refractor; 0.07-deg tail in p.a. 84)
2018 Jun. 21.93, 13.7, 1.12' (E. Bryssinck, Kruibeke, Belgium, 0.4-m Newtonian reflector; 0.08-deg tail in p.a. 83)
2018 Jun. 18.96, 13.9, 3.2' (T. Lehmann, 0.075-m reflector; 0.12-deg tail in p.a. 86)

C/2015 V2 (Johnson)
Total-magnitude and coma-diameter estimates:
2018 Jun. 23.80, 14.8, 2.7' (T. Lehmann, 0.4-m Newtonian reflector; 0.36-deg tail in p.a. 219)
2018 Jun. 18.39, 15.2, 0.5' (M. Masek, 0.3-m Schmidt-Cassegrain; 0.9' tail in p.a. 217)

C/2016 M1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2018 Jul. 17.50, 9.0, 5' (P. Camilleri, 0.08-m refractor)
2018 Jul. 16.42, 9.0, 3.5' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 15.97, 8.8, 3' (W. Souza, 0.1-m refractor)
2018 Jul. 15.14, 8.7, 6' (M. Goiato, 20x100 binoculars)
2018 Jul. 13.71, 8.7, 3.5' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 12.47, 8.7, 5.4' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 11.73, 8.7, 5.1' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 10.44, 8.6, 6' (P. Camilleri, 20x80 binoculars)
2018 Jul. 09.68, 8.1, 19' (T. Lehmann, 0.106-m refractor)
2018 Jul. 09.46, 8.5, 5' (P. Camilleri, 0.08-m refractor)
2018 Jul. 08.50, 8.6, 6' (P. Camilleri, 20x80 binoculars)
2018 Jul. 08.38, 8.3, 5.6' (C. Wyatt, 0.25-m Newtonian reflector; 5.0' tail in p.a. 40)
2018 Jul. 06.65, 7.9, 14.2' (R. Ramlow, 0.106-m refractor; 16.0' tail in p.a. 21)
2018 Jul. 06.51, 8.5, 5.3' (C. Wyatt, 0.25-m Newtonian reflector; 5.0' tail in p.a. 45)
2018 Jul. 06.12, 8.4, 6' (M. Goiato, 20x100 binoculars)
2018 Jul. 04.36, 8.5, 4.8' (C. Wyatt, 0.25-m Newtonian reflector; 6.0' tail in p.a. 30)
2018 Jul. 04.05, 8.5, 6' (M. Goiato, 20x100 binoculars)
2018 Jul. 01.48, 7.9, 22' (T. Lehmann, 0.106-m refractor)
2018 Jun. 30.42, 8.5, 8' (P. Camilleri, 20x80 binoculars)
2018 Jun. 24.82, 8.5, 8' (P. Camilleri, 20x80 binoculars)
2018 Jun. 23.81, 8.5, 8' (P. Camilleri, 20x80 binoculars)
2018 Jun. 23.74, 8.6, 6' (C. Wyatt, 0.25-m Newtonian reflector; 4.7' tail in p.a. 348)
2018 Jun. 23.66, 7.9, 13.7' (R. Ramlow, 0.106-m refractor; 24.0' tail in p.a. 7)
2018 Jun. 22.74, 8.7, 4.2' (C. Wyatt, 0.25-m Newtonian reflector; 6.4' tail)
2018 Jun. 22.38, 8.3, 4' (C. Hergenrother, 30x125 binoculars)
2018 Jun. 22.05, 8.9, 3' (A. Amorim, 0.09-m refractor)
2018 Jun. 21.77, 8.6, 6' (P. Camilleri, 20x80 binoculars)
2018 Jun. 21.06, 8.9, 4' (A. Amorim, 0.09-m refractor)
2018 Jun. 20.82, 8.8, 5' (P. Camilleri, 20x80 binoculars)
2018 Jun. 20.36, 8.5, 3.6' (N. Paul, Slooh, La Dehesa (MPC - W88), 0.35-m Ritchey-Chretien)
2018 Jun. 19.65, 7.6, 17' (T. Lehmann, 0.106-m refractor)
2018 Jun. 19.50, 8.7, 6' (P. Camilleri, 20x80 binoculars)
2018 Jun. 19.30, 8.5, 5' (C. Hergenrother, 30x125 binoculars)
2018 Jun. 19.05, 8.6, 6' (M. Goiato, 20x100 binoculars)
2018 Jun. 19.05, 7.7, 10' (J. Gonzalez Suarez, 10x50 binoculars)
2018 Jun. 19.04, 7.9, 8' (J. Gonzalez Suarez, 25x100 binoculars; 0.3-deg tail in p.a. 350)
2018 Jun. 19.03, 8.3, 6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain; 0.3-deg tail in p.a. 350)
2018 Jun. 18.64, 8.7, 5' (P. Camilleri, 20x80 binoculars)
2018 Jun. 18.05, 8.7, 5' (M. Goiato, 20x100 binoculars)

C/2016 R2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2018 Jul. 14.93, 11.9, 2.6' (J. Cerny, 0.355-m Newtonian reflector)
2018 Jul. 09.92, 11.3, 2.5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2018 Jul. 07.96, 11.4, 6.9' (T. Lehmann, 0.075-m reflector; 0.27-deg tail in p.a. 12)
2018 Jun. 18.93, 11.5, 6.7' (T. Lehmann, 0.075-m reflector; 0.52-deg tail in p.a. 32)

C/2017 B3 (LINEAR)
Total-magnitude and coma-diameter estimates:
2018 Jun. 18.06, 15.1, 0.2' (M. Masek, 0.3-m Schmidt-Cassegrain)

C/2017 K2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2018 Jul. 08.93, 18.1, 0.8' (T. Lehmann, 0.4-m Newtonian reflector)
2018 Jun. 24.17, 17.3, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2018 Jun. 18.94, 17.7, 0.9' (S. Fritsche, 0.1-m refractor)

C/2017 M4 (ATLAS)
Total-magnitude and coma-diameter estimates:
2018 Jul. 17.52, 14.0, 0.5' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jul. 16.95, 14.1, 0.4' (C. Harder, Jeersdorf, Germany, 0.402-m Newtonian reflector)
2018 Jul. 15.95, 13.6, 0.6' (C. Harder, Jeersdorf, Germany, 0.402-m Newtonian reflector)
2018 Jul. 13.93, 13.9, 0.5' (S. Szabo, Csapod, 0.6-m Newtonian reflector)
2018 Jul. 13.51, 13.6, 0.4' (S. Yoshida, 0.4-m Newtonian reflector)

C/2017 S3 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2018 Jul. 17.95, 7.4, 5.5' (M. Meyer, 0.12-m refractor)
2018 Jul. 17.95, 7.0, 5' (D. Vansteelant, Varsenare, 0.3-m Newtonian reflector)
2018 Jul. 17.94, 8.2, 6' (N. James, 0.28-m Schmidt-Cassegrain)
2018 Jul. 17.87, 7.8, 3' (A. Tsvetkov, Zavolzhye, 0.05-m reflector)
2018 Jul. 17.04, 8.1, 7.33' (N. James, 0.28-m Schmidt-Cassegrain)
2018 Jul. 17.02, 8.5, 8.1' (D. Bamberger, 0.254-m Ritchey-Chretien; 4.5' tail in p.a. 288)
2018 Jul. 16.96, 8.2, 3.8' (C. Harder, Jeersdorf, Germany, 0.402-m Newtonian reflector)
2018 Jul. 16.85, 7.8, 5' (A. Tsvetkov, Zavolzhye, 0.05-m reflector)
2018 Jul. 16.05, 8.7, 6.3' (D. Bamberger, 0.254-m Ritchey-Chretien; 9.8' tail in p.a. 287)
2018 Jul. 16.02, 7.8, 3.5' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2018 Jul. 15.98, 8.5, 5.83' (N. James, 0.28-m Schmidt-Cassegrain)
2018 Jul. 15.93, 8.6, 3' (C. Harder, Jeersdorf, Germany, 0.402-m Newtonian reflector)
2018 Jul. 15.03, 9.7, 1.7' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2018 Jul. 14.97, 9.5, 2.5' (C. Harder, Jeersdorf, Germany, 0.402-m Newtonian reflector)
2018 Jul. 14.95, 9.7, 1.8' (J. Cerny, 0.355-m Newtonian reflector)
2018 Jul. 13.92, 10.6, 3.5' (S. Szabo, Csapod, 0.6-m Newtonian reflector)
2018 Jul. 13.70, 10.2, 3.5' (S. Yoshida, 0.4-m Newtonian reflector)
2018 Jul. 12.02, 10.2, 4' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2018 Jul. 09.97, 9.7, 2' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2018 Jul. 09.96, 10.6, 4' (P. Guzik, 0.326-m Newtonian reflector)
2018 Jul. 09.93, 9.5, 4.5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2018 Jul. 08.99, 10.6, 1' (W. Kutschera, 0.13-m Newtonian reflector)
2018 Jul. 08.99, 10.5, 10' (T. Lehmann, 0.4-m Newtonian reflector)
2018 Jul. 08.07, 12.3, 3.5' (D. Bamberger, 0.254-m Ritchey-Chretien; 4.4' tail in p.a. 295)
2018 Jul. 08.00, 10.3, 9.5' (T. Lehmann, 0.4-m Newtonian reflector)
2018 Jul. 07.99, 10.0, 4' (A. Scholten, Eerbeek, 0.2-m Newtonian reflector)
2018 Jul. 07.97, 9.2, 2.5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2018 Jul. 07.96, 11.1, 2' (U. Pilz, 0.32-m Newtonian reflector)
2018 Jul. 07.93, 10.3, 3' (C. Harder, Jeersdorf, Germany, 0.252-m Newtonian reflector)
2018 Jul. 07.07, 11.3, 2.8' (D. Bamberger, 0.254-m Ritchey-Chretien)
2018 Jul. 07.02, 9.1, 5' (C. Labordena, La Serra, 0.2-m Schmidt-Cassegrain)
2018 Jul. 06.97, 9.8, 13' (T. Lehmann, 0.075-m reflector)
2018 Jul. 06.06, 11.2, 3.8' (D. Bamberger, 0.254-m Ritchey-Chretien; 3.0' tail in p.a. 303)
2018 Jul. 06.02, 9.9, 4.2' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2018 Jul. 05.99, 9.6, 3' (A. Scholten, Eerbeek, 0.2-m Newtonian reflector)
2018 Jul. 05.99, 9.2, 5' (C. Labordena, Culla, 0.2-m Schmidt-Cassegrain)
2018 Jul. 05.40, 9.2, 7' (R. Ramlow, 0.106-m refractor)
2018 Jul. 04.94, 9.4, 2.3' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2018 Jul. 04.90, 9.1, 3.9' (A. Novichonok, Simeiz observatory, 0.15-m Newtonian reflector)
2018 Jul. 04.83, 9.2, 5' (Y. Chen, wuchuan, 0.15-m Newtonian reflector)
2018 Jul. 04.03, 9.1, 10' (S. Fritsche, 0.1-m refractor)
2018 Jul. 03.95, 9.0, 5' (J. Gonzalez Suarez, 25x100 binoculars)
2018 Jul. 03.94, 9.1, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2018 Jul. 03.94, 9.4, 5.7' (S. Fritsche, 0.1-m refractor)
2018 Jul. 03.94, 9.2, 10' (T. Lehmann, 0.4-m Newtonian reflector)
2018 Jul. 03.89, 9.2, 4' (P. Guzik, 25x100 binoculars)
2018 Jul. 03.88, 9.4, 4' (P. Guzik, 0.326-m Newtonian reflector)
2018 Jul. 03.85, 9.3, 3.5' (A. Novichonok, Simeiz observatory, 0.15-m Newtonian reflector)
2018 Jul. 03.05, 11.2, 3.9' (D. Bamberger, 0.254-m Ritchey-Chretien)
2018 Jul. 03.04, 9.7, 2.2' (G. van Buitenen, Dordrecht, Netherlands, 0.13-m Newtonian reflector)
2018 Jul. 02.94, 9.8, 8.8' (T. Lehmann, 0.4-m Newtonian reflector)
2018 Jul. 02.92, 9.7, 2' (U. Pilz, 0.32-m Newtonian reflector)
2018 Jul. 02.92, 9.3, 8.9' (J. Cerny, 0.355-m Newtonian reflector)
2018 Jun. 26.38, 12.3, 2.2' (R. Ramlow, 0.106-m refractor)
2018 Jun. 26.05, 13.5, 2.3' (D. Bamberger, 0.254-m Ritchey-Chretien; 1.9' tail in p.a. 309)
2018 Jun. 24.21, 12.4, 1.2' (K. Hills, 0.5-m Newtonian reflector)

C/2017 T3 (ATLAS)
Total-magnitude and coma-diameter estimates:
2018 Jul. 16.79, 8.9, 5.2' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 13.79, 9.4, 3' (C. Wyatt, 0.25-m Newtonian reflector; 3.8' tail in p.a. 260)
2018 Jul. 11.79, 9.3, 4.4' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 06.84, 9.1, 3.1' (R. Ramlow, 0.106-m refractor)
2018 Jun. 23.81, 8.8, 4.1' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jun. 22.81, 9.4, 2.8' (C. Wyatt, 0.25-m Newtonian reflector)

C/2018 C2 (Lemmon)
Total-magnitude and coma-diameter estimates:
2018 Jul. 13.91, 15.8, 0.2' (S. Szabo, Csapod, 0.6-m Newtonian reflector)
2018 Jul. 02.00, 15.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2018 K1 (Weiland)
Total-magnitude and coma-diameter estimates:
2018 Jul. 03.91, 15.2, 1.5' (S. Fritsche, 0.1-m refractor)

C/2018 L2 (ATLAS)
Total-magnitude and coma-diameter estimates:
2018 Jul. 06.91, 13.5, 0.9' (K. Hills, 0.5-m Newtonian reflector)

C/2018 M1 (Catalina)
Total-magnitude and coma-diameter estimates:
2018 Jul. 02.19, 17.0, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2018 N1 (NEOWISE)
Total-magnitude and coma-diameter estimates:
2018 Jul. 17.78, 10.0, 7' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jul. 16.78, 10.1, 6' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jul. 16.72, 10.1, 5.5' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 15.82, 9.8, 12' (R. Ramlow, 0.09-m refractor)
2018 Jul. 15.55, 10.7, 4' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 15.25, 11.7, 3' (M. Goiato, 0.22-m Newtonian reflector)
2018 Jul. 14.04, 11.6, 1.1' (S. Szabo, Csapod, 0.6-m Newtonian reflector)
2018 Jul. 13.75, 10.3, 5' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 13.72, 12.0, 1.8' (S. Yoshida, 0.4-m Newtonian reflector)
2018 Jul. 12.75, 10.1, 11.6' (R. Ramlow, 0.09-m refractor)
2018 Jul. 11.75, 11.1, 4.1' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 11.72, 10.5, 6' (G. van Buitenen, Siding Spring, AU, 0.106-m refractor)
2018 Jul. 10.77, 10.9, 6' (P. Camilleri, 0.406-m Newtonian reflector)
2018 Jul. 10.10, 9.4, 12' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2018 Jul. 09.74, 10.5, 10' (R. Ramlow, 0.106-m refractor)
2018 Jul. 09.70, 10.2, 16' (T. Lehmann, 0.106-m refractor)
2018 Jul. 09.64, 11.5, 3.3' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Jul. 08.79, 11.4, 4' (P. Camilleri, 0.406-m Newtonian reflector)