12P/Pons-Brooks
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
28.95,
17.3,
0.4'
(M. Lošťák,
0.2-m
Newtonian + CCD);
   
27.97,
16.9,
0.9'
(T. Lehmann,
Weimar,
0.279-m
Newtonian + CCD;
0.6'
tail in p.a. 270 deg);
   
26.01,
17.4,
0.5'
(M. Lošťák,
0.2-m
Newtonian + CCD);
   
25.23,
17.8,
--
(J. Maikner,
Comet Hunter Observatory 2,
0.305-m
Hyperboloid astro-camera + CCD);
   
25.01,
17.0,
0.8'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD;
0.3'
tail in p.a. 139 deg);
   
15.64,
17.4,
0.2'
(K. Yoshimoto,
0.203-m
Ritchey-Chretien + CCD);
   
12.23,
17.6,
--
(J. Maikner,
Comet Hunter Observatory 2,
0.305-m
Hyperboloid astro-camera + CCD);
   
11.22,
17.4,
--
(J. Maikner,
Comet Hunter Observatory 2,
0.305-m
Hyperboloid astro-camera + CCD);
   
09.95,
17.3,
0.2'
(M. Jager,
G00 AZM Martinsberg, Austria,
0.305-m
Newtonian + CCD;
25'
tail in p.a. 287 deg);
71P/Clark
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
31.15,
13.8,
3.6'
(T. Lehmann,
Hakos (remote),
0.2-m
Newtonian + CCD;
0.22° tail in p.a. 240 deg);
   
25.15,
13.7,
3.5'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD;
0.24° tail in p.a. 241 deg);
   
23.84,
13.2,
0.5'
(P. Camilleri,
0.406-m
Newtonian);
   
22.15,
13.7,
3.1'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD;
0.25° tail in p.a. 243 deg);
   
21.83,
13.5,
0.8'
(P. Camilleri,
0.406-m
Newtonian);
   
20.31,
13.7,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
18.31,
13.5,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
16.83,
13.0,
0.4'
(P. Camilleri,
0.406-m
Newtonian);
72P/Denning-Fujikawa
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
18.17,
18.5,
--
(G. Pappa,
Namibia (remote control),
0.5-m
Prime focus of a reflector + CCD);
77P/Longmore
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
23.47,
14.2,
0.4'
(P. Camilleri,
0.406-m
Newtonian);
   
23.44,
14.3,
1.4'
(C. Wyatt,
0.4-m
Newtonian);
   
21.46,
14.2,
0.4'
(P. Camilleri,
0.406-m
Newtonian);
   
19.84,
13.8,
2.3'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD;
2.4'
tail in p.a. 20 deg);
   
16.48,
14.1,
0.5'
(P. Camilleri,
0.406-m
Newtonian);
   
14.74,
14.0,
--
(G. Pappa,
Namibia (remote control),
0.2-m
Newtonian + CCD);
   
14.07,
14.0,
--
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
13.54,
14.0,
1'
(P. Camilleri,
0.406-m
Newtonian);
   
13.08,
13.9,
--
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
12.50,
14.0,
1'
(P. Camilleri,
0.406-m
Newtonian);
80P/Peters-Hartley
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
26.34,
18.9,
--
(J. Maikner,
Comet Hunter Observatory 2,
0.305-m
Hyperboloid astro-camera + CCD);
81P/Wild
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
30.05,
13.1,
2.1'
(T. Lehmann,
Hakos (remote),
0.2-m
Newtonian + CCD;
0.16° tail in p.a. 273 deg);
   
26.05,
14.0,
--
(G. van Buitenen,
Dordrecht, NL (G06),
0.203-m
Ritchey-Chretien + CCD);
   
24.70,
12.0,
0.9'
(O. Miyazaki,
0.32-m
Newtonian);
   
23.76,
13.0,
0.5'
(P. Camilleri,
0.406-m
Newtonian);
   
21.96,
13.2,
1.4'
(M. Paradowski,
0.068-m
Refractor + CCD);
   
21.76,
13.2,
0.5'
(P. Camilleri,
0.406-m
Newtonian);
   
17.72,
12.6,
0.9'
(O. Miyazaki,
0.32-m
Newtonian);
   
16.73,
13.0,
1.2'
(O. Miyazaki,
0.32-m
Newtonian);
   
11.02,
14.3,
0.3'
(G. Pappa,
Namibia (remote control),
0.5-m
Prime focus of a reflector + CCD);
96P/Machholz
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
12.30,
17.4,
--
(J. Maikner,
Comet Hunter Observatory 2,
0.305-m
Hyperboloid astro-camera + CCD);
   
11.94,
17.4,
--
(G. Pappa,
Namibia (remote control),
0.2-m
Newtonian + CCD);
99P/Kowal
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
13.14,
16.9,
0.38'
(K. Hills,
0.5-m
Newtonian + CCD);
103P/Hartley
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
jun
01.14,
15.8,
2.6'
(T. Lehmann,
Hakos (remote),
0.2-m
Newtonian + CCD);
may
30.14,
17.2,
1.1'
(T. Lehmann,
Hakos (remote),
0.2-m
Newtonian + CCD);
   
21.16,
17.1,
1.6'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD);
   
18.34,
19.2,
--
(J. Maikner,
Comet Hunter Observatory 2,
0.305-m
Hyperboloid astro-camera + CCD);
117P/Helin-Roman-Alu
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
25.15,
15.9,
1.3'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD;
0.12° tail in p.a. 239 deg);
   
22.15,
15.9,
1.3'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD;
0.18° tail in p.a. 242 deg);
126P/IRAS
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
19.17,
15.0,
--
(G. Pappa,
Namibia (remote control),
0.106-m
Refractor + CCD);
185P/Petriew
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
30.17,
14.8,
2.7'
(T. Lehmann,
Hakos (remote),
0.2-m
Newtonian + CCD);
   
25.17,
15.0,
2.2'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD);
199P/Shoemaker
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
26.07,
16.9,
--
(G. van Buitenen,
Dordrecht, NL (G06),
0.203-m
Ritchey-Chretien + CCD);
   
15.05,
16.7,
--
(G. Pappa,
Namibia (remote control),
0.2-m
Newtonian + CCD);
219P/LINEAR
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
26.88,
16.8,
--
(G. Pappa,
Namibia (remote control),
0.5-m
Prime focus of a reflector + CCD);
   
26.25,
17.6,
--
(J. Maikner,
Comet Hunter Observatory 2,
0.305-m
Hyperboloid astro-camera + CCD);
   
25.26,
18.6,
--
(J. Maikner,
Comet Hunter Observatory 2,
0.305-m
Hyperboloid astro-camera + CCD);
237P/LINEAR
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
31.72,
12.5,
0.9'
(O. Miyazaki,
0.32-m
Newtonian);
   
29.11,
12.0,
3.8'
(P. Carson,
PGC Observatory Z10, Fregenal de la sierra, Spain,
0.315-m
Cassegrain reflector + CCD);
   
28.04,
12.1,
3.8'
(T. Lehmann,
Weimar,
0.279-m
Newtonian + CCD;
0.17° tail in p.a. 257 deg);
   
28.04,
13.0,
1'
(W. Hasubick,
0.44-m
Newtonian);
   
26.09,
13.4,
--
(G. van Buitenen,
Dordrecht, NL (G06),
0.203-m
Ritchey-Chretien + CCD);
   
26.01,
12.6,
1'
(C. Harder,
Farm Heimat, NAM,
0.196-m
Newtonian);
   
25.05,
12.4,
3'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD;
0.13° tail in p.a. 254 deg);
   
23.82,
12.6,
1'
(P. Camilleri,
0.406-m
Newtonian);
   
23.74,
11.9,
2.2'
(O. Miyazaki,
0.32-m
Newtonian);
   
22.02,
12.1,
2.1'
(M. Paradowski,
0.068-m
Refractor + CCD);
   
21.74,
12.7,
1.1'
(P. Camilleri,
0.406-m
Newtonian);
   
20.28,
13.3,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
20.12,
12.6,
2.5'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD;
0.15° tail in p.a. 256 deg);
   
20.07,
12.4,
1.3'
(C. Harder,
Capricorn Restcamp, NAM,
0.508-m
Newtonian);
   
18.28,
13.3,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
17.73,
13.4,
0.8'
(O. Miyazaki,
0.32-m
Newtonian);
   
16.98,
12.9,
0.9'
(C. Harder,
Capricorn Restcamp, NAM,
0.508-m
Newtonian);
   
16.77,
12.7,
1'
(P. Camilleri,
0.406-m
Newtonian);
   
16.71,
12.1,
0.9'
(O. Miyazaki,
0.32-m
Newtonian);
   
16.68,
13.0,
1.1'
(K. Harikae,
0.15-m
Newtonian + CCD;
0.9'
tail in p.a. 262 deg);
   
16.06,
12.4,
2.5'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD;
0.07° tail in p.a. 257 deg);
   
14.00,
11.9,
0.75'
(C. Harder,
Capricorn Restcamp, NAM,
0.508-m
Newtonian);
   
13.28,
13.4,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
12.28,
14.3,
1'
(J. Maikner,
Comet Hunter Observatory 2,
0.305-m
Hyperboloid astro-camera + CCD);
   
11.94,
13.8,
1'
(G. Pappa,
Namibia (remote control),
0.2-m
Newtonian + CCD);
263P/Gibbs
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
18.08,
18.8,
--
(J. Maikner,
Comet Hunter Observatory 2,
0.305-m
Hyperboloid astro-camera + CCD);
   
11.07,
19.1,
--
(J. Maikner,
Comet Hunter Observatory 2,
0.305-m
Hyperboloid astro-camera + CCD);
287P/Christensen
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
11.08,
18.0,
--
(G. Pappa,
Namibia (remote control),
0.5-m
Prime focus of a reflector + CCD);
364P/PANSTARRS
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
31.17,
12.7,
3.3'
(T. Lehmann,
Hakos (remote),
0.2-m
Newtonian + CCD;
1.27° tail in p.a. 235 deg);
   
23.83,
13.0,
0.5'
(P. Camilleri,
0.406-m
Newtonian);
   
21.84,
12.7,
0.5'
(P. Camilleri,
0.406-m
Newtonian;
1.5'
tail in p.a. 210 deg);
   
20.31,
12.9,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
20.15,
12.1,
3'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD;
1.06° tail in p.a. 236 deg);
   
19.31,
12.7,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
18.30,
12.7,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
16.84,
12.3,
0.4'
(P. Camilleri,
0.406-m
Newtonian;
1.5'
tail in p.a. 215 deg);
   
13.31,
12.6,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
12.31,
12.6,
2'
(J. de Souza Aguiar,
0.3-m
Newtonian);
C/2014 UN271 (Bernardinelli-Bernstein)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
jun
01.17,
16.1,
1.8'
(T. Lehmann,
Hakos (remote),
0.2-m
Newtonian + CCD);
may
22.16,
16.3,
1.4'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD);
C/2017 K2 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
30.73,
10.7,
5.7'
(T. Lehmann,
Hakos (remote),
0.2-m
Newtonian + CCD;
0.51° tail in p.a. 182 deg);
   
19.74,
10.6,
2.2'
(C. Harder,
Capricorn Restcamp, NAM,
0.508-m
Newtonian);
   
19.73,
10.4,
7.8'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD;
0.69° tail in p.a. 186 deg);
   
18.74,
11.0,
1.9'
(C. Harder,
Capricorn Restcamp, NAM,
0.508-m
Newtonian);
   
17.75,
11.0,
2'
(C. Harder,
Capricorn Restcamp, NAM,
0.508-m
Newtonian);
   
13.74,
10.0,
3.3'
(C. Harder,
Capricorn Restcamp, NAM,
0.196-m
Newtonian);
C/2019 L3 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
23.44,
12.9,
0.8'
(P. Camilleri,
0.406-m
Newtonian);
   
23.42,
12.7,
1'
(C. Wyatt,
0.4-m
Newtonian);
   
21.42,
13.0,
0.5'
(P. Camilleri,
0.406-m
Newtonian);
   
20.99,
13.6,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
20.81,
12.9,
1.1'
(C. Harder,
Soft Adventure Camp, NAM,
0.196-m
Newtonian);
   
19.86,
12.9,
1.1'
(C. Harder,
Capricorn Restcamp, NAM,
0.508-m
Newtonian);
   
19.81,
11.9,
5.1'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD;
0.18° tail in p.a. 338 deg);
   
18.77,
12.4,
1.5'
(C. Harder,
Capricorn Restcamp, NAM,
0.508-m
Newtonian);
   
17.98,
13.5,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
16.97,
13.5,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
16.44,
12.9,
0.8'
(P. Camilleri,
0.406-m
Newtonian);
   
15.98,
13.4,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
14.98,
13.4,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
14.80,
12.4,
1.5'
(C. Harder,
Capricorn Restcamp, NAM,
0.508-m
Newtonian);
   
13.98,
13.3,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
13.52,
13.4,
1.2'
(P. Camilleri,
0.406-m
Newtonian);
   
12.99,
13.3,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
12.46,
13.6,
0.5'
(P. Camilleri,
0.406-m
Newtonian);
   
11.98,
13.2,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
09.74,
12.8,
0.8'
(G. Pappa,
Namibia (remote control),
0.5-m
Prime focus of a reflector + CCD);
C/2019 T4 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
jun
07.52,
12.8,
1.2'
(O. Miyazaki,
0.32-m
Newtonian);
   
05.99,
12.4,
1.3'
(W. Kutschera,
0.54-m
Newtonian);
   
05.95,
14.6,
0.48'
(S. Shurpakov,
0.41-m
Newtonian + CCD);
   
02.88,
14.0,
2.2'
(M. Lošťák,
0.2-m
Newtonian + CCD);
may
30.93,
13.3,
2.4'
(T. Lehmann,
Weimar,
0.279-m
Newtonian + CCD;
0.16° tail in p.a. 234 deg);
   
30.38,
14.3,
1.4'
(D. Heggie,
UDRO, Utah,
0.15-m
Refractor + CCD;
5'
tail in p.a. 233 deg);
   
28.03,
11.8,
0.6'
(W. Hasubick,
0.44-m
Newtonian);
   
25.99,
12.8,
1.5'
(C. Harder,
Capricorn Restcamp, NAM,
0.196-m
Newtonian);
   
25.97,
13.1,
1.5'
(G. van Buitenen,
Dordrecht, NL (G06),
0.203-m
Ritchey-Chretien + CCD;
13'
tail in p.a. 237 deg);
   
25.95,
13.4,
4'
(M. Lošťák,
0.2-m
Newtonian + CCD);
   
24.97,
13.2,
2.5'
(T. Lehmann,
Weimar,
0.279-m
Newtonian + CCD;
0.17° tail in p.a. 236 deg);
   
24.51,
12.4,
1.6'
(O. Miyazaki,
0.32-m
Newtonian);
   
23.75,
12.8,
1.5'
(P. Camilleri,
0.406-m
Newtonian);
   
23.73,
12.8,
1.3'
(O. Miyazaki,
0.32-m
Newtonian);
   
23.45,
13.3,
2'
(C. Wyatt,
0.4-m
Newtonian);
   
22.00,
13.1,
1.5'
(G. van Buitenen,
Dordrecht, NL,
0.203-m
Ritchey-Chretien + CCD;
4'
tail in p.a. 235 deg);
   
21.91,
12.9,
2.1'
(M. Paradowski,
0.068-m
Refractor + CCD);
   
21.87,
13.5,
0.5'
(G. Pappa,
Namibia (remote control),
0.106-m
Refractor + CCD;
8'
tail);
   
21.73,
13.3,
0.8'
(P. Camilleri,
0.406-m
Newtonian);
   
20.95,
13.2,
2.2'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD;
0.19° tail in p.a. 234 deg);
   
20.86,
13.4,
0.5'
(C. Harder,
Soft Adventure Camp, NAM,
0.196-m
Newtonian);
   
20.25,
13.7,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
20.08,
13.0,
0.9'
(C. Harder,
Capricorn Restcamp, NAM,
0.508-m
Newtonian);
   
18.95,
12.9,
1.8'
(C. Harder,
Capricorn Restcamp, NAM,
0.508-m
Newtonian);
   
18.25,
13.7,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
17.96,
12.9,
3.7'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD;
0.09° tail in p.a. 232 deg);
   
17.50,
13.0,
1.5'
(O. Miyazaki,
0.32-m
Newtonian);
   
16.76,
13.6,
0.5'
(P. Camilleri,
0.406-m
Newtonian);
   
16.68,
13.4,
1.7'
(K. Harikae,
0.15-m
Newtonian + CCD);
   
15.96,
12.8,
5.1'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD;
0.23° tail in p.a. 238 deg);
   
15.56,
13.3,
1.3'
(K. Yoshimoto,
0.203-m
Ritchey-Chretien + CCD;
11'
tail in p.a. 235 deg);
   
13.99,
13.1,
1.1'
(W. Kutschera,
0.54-m
Newtonian);
   
13.88,
14.3,
0.58'
(S. Shurpakov,
0.41-m
Newtonian + CCD;
8.3'
tail in p.a. 239 deg);
   
11.32,
13.5,
1.3'
(D. Heggie,
UDRO, Utah,
0.15-m
Refractor + CCD;
13'
tail in p.a. 237 deg);
   
11.01,
12.8,
2.1'
(M. Paradowski,
0.068-m
Refractor + CCD);
   
09.88,
12.9,
1.5'
(P. Guzik,
0.326-m
Newtonian);
C/2019 U5 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
27.86,
12.2,
--
(T. Csorgei,
Blahová,
0.28-m
Schmidt-Cassegrain + CCD);
   
25.86,
12.8,
--
(T. Csorgei,
Blahová,
0.28-m
Schmidt-Cassegrain + CCD);
   
24.48,
12.1,
1.1'
(O. Miyazaki,
0.32-m
Newtonian);
   
23.45,
12.7,
0.6'
(P. Camilleri,
0.406-m
Newtonian);
   
23.43,
13.7,
0.7'
(C. Wyatt,
0.4-m
Newtonian;
3'
tail in p.a. 68 deg);
   
21.43,
12.8,
1'
(P. Camilleri,
0.406-m
Newtonian);
   
20.99,
13.2,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
20.89,
12.5,
0.8'
(G. Sánta,
Aka,
0.25-m
Newtonian);
   
19.82,
13.3,
1.5'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD;
0.14° tail in p.a. 55 deg);
   
19.77,
13.1,
1.3'
(C. Harder,
Capricorn Restcamp, NAM,
0.508-m
Newtonian);
   
18.78,
13.0,
1.5'
(C. Harder,
Capricorn Restcamp, NAM,
0.508-m
Newtonian);
   
17.99,
13.2,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
17.47,
13.3,
1.2'
(O. Miyazaki,
0.32-m
Newtonian);
   
16.98,
13.1,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
16.48,
12.5,
1.2'
(O. Miyazaki,
0.32-m
Newtonian);
   
16.46,
12.7,
1'
(P. Camilleri,
0.406-m
Newtonian);
   
15.99,
13.1,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
15.88,
11.8,
1.5'
(C. Labordena,
Atzaneta,
0.2-m
Schmidt-Cassegrain);
   
15.86,
12.8,
3.1'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD);
   
14.99,
13.0,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
13.99,
13.0,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
13.53,
12.9,
1.5'
(P. Camilleri,
0.406-m
Newtonian);
   
12.99,
12.9,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
12.92,
11.5,
2'
(J. Gonzalez Suarez,
0.203-m
Schmidt-Cassegrain);
   
12.86,
12.0,
1.5'
(C. Harder,
Capricorn Restcamp, NAM,
0.196-m
Newtonian);
   
12.48,
12.8,
1.2'
(P. Camilleri,
0.406-m
Newtonian);
   
12.46,
12.2,
1'
(M. Mattiazzo,
Halls creek, WA,
0.28-m
Schmidt-Cassegrain);
   
11.99,
12.9,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
11.58,
11.7,
1.1'
(O. Miyazaki,
0.32-m
Newtonian);
   
10.50,
12.5,
1.1'
(O. Miyazaki,
0.32-m
Newtonian);
   
09.89,
12.5,
1.5'
(P. Guzik,
0.326-m
Newtonian);
   
09.48,
12.8,
1.1'
(O. Miyazaki,
0.32-m
Newtonian);
C/2020 K1 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
30.16,
12.2,
4.8'
(T. Lehmann,
Hakos (remote),
0.2-m
Newtonian + CCD;
0.25° tail in p.a. 315 deg);
   
27.12,
12.3,
1'
(C. Harder,
Farm Heimat, NAM,
0.196-m
Newtonian);
   
26.02,
13.0,
1.3'
(C. Harder,
Hardap Resort, NAM,
0.196-m
Newtonian);
   
24.12,
12.8,
1.7'
(C. Harder,
Hardap Resort, NAM,
0.196-m
Newtonian);
   
23.77,
12.7,
1'
(P. Camilleri,
0.406-m
Newtonian);
   
23.46,
12.5,
1.7'
(C. Wyatt,
0.4-m
Newtonian);
   
21.75,
12.7,
1'
(P. Camilleri,
0.406-m
Newtonian);
   
20.28,
12.1,
2'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
20.13,
12.5,
2.7'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD;
0.2° tail in p.a. 314 deg);
   
20.05,
12.5,
1.5'
(C. Harder,
Cap,
0.508-m
Newtonian);
   
19.30,
12.2,
2'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
19.15,
10.6,
1.6'
(J. Chambó Bris,
Farm Hakos, Namibia,
0.508-m
Ritchey-Chretien + CCD;
8.5'
tail in p.a. 320 deg);
   
18.94,
12.4,
1.6'
(C. Harder,
Capricorn Restcamp, NAM,
0.508-m
Newtonian);
   
18.29,
12.2,
2'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
18.07,
11.6,
2'
(C. Harder,
Capricorn Restcamp, NAM,
0.508-m
Newtonian);
   
16.78,
12.8,
0.7'
(P. Camilleri,
0.406-m
Newtonian);
   
13.29,
12.4,
2'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
12.28,
12.4,
2'
(J. de Souza Aguiar,
0.3-m
Newtonian);
C/2020 R7 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
30.97,
15.5,
1.4'
(T. Lehmann,
Weimar,
0.279-m
Newtonian + CCD;
0.09° tail in p.a. 160 deg);
   
29.09,
16.0,
0.6'
(P. Carson,
PGC Observatory Z10, Fregenal de la sierra, Spain,
0.315-m
Cassegrain reflector + CCD);
   
26.01,
16.4,
--
(G. van Buitenen,
Dordrecht, NL (G06),
0.203-m
Ritchey-Chretien + CCD);
   
25.97,
15.7,
1.8'
(M. Lošťák,
0.2-m
Newtonian + CCD);
   
25.93,
15.6,
1.3'
(T. Lehmann,
Weimar,
0.279-m
Newtonian + CCD;
0.06° tail in p.a. 167 deg);
   
20.02,
15.5,
1.5'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD;
0.08° tail in p.a. 166 deg);
   
16.03,
14.9,
2.2'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD;
0.06° tail in p.a. 164 deg);
   
13.96,
16.0,
0.29'
(S. Shurpakov,
0.41-m
Newtonian + CCD;
0.6'
tail in p.a. 151 deg);
   
12.14,
15.2,
0.7'
(W. Kutschera,
0.54-m
Newtonian + CCD);
C/2020 S4 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
30.90,
16.0,
1.1'
(T. Lehmann,
Weimar,
0.279-m
Newtonian + CCD;
2.3'
tail in p.a. 267 deg);
   
20.74,
16.0,
1'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD;
0.06° tail in p.a. 262 deg);
   
15.92,
16.4,
0.9'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD);
C/2021 G2 (Atlas)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
20.76,
15.4,
1'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD;
1'
tail in p.a. 285 deg);
C/2021 S3 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
30.76,
14.4,
1.2'
(T. Lehmann,
Hakos (remote),
0.2-m
Newtonian + CCD;
1.3'
tail in p.a. 262 deg);
   
19.76,
14.5,
1'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD;
0.9'
tail in p.a. 286 deg);
   
13.74,
13.6,
0.6'
(J. Chambó Bris,
Farm Hakos, Namibia,
0.508-m
Ritchey-Chretien + CCD;
1'
tail in p.a. 287 deg);
C/2021 T4 (Lemmon)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
jun
01.15,
10.6,
12'
(T. Lehmann,
Hakos (remote),
0.2-m
Newtonian + CCD);
may
31.17,
10.4,
4'
(J. Chambó Bris,
Farm Hakos, Namibia,
0.508-m
Ritchey-Chretien + CCD);
   
24.81,
11.2,
4'
(M. Mattiazzo,
Victoria River, Northern Territory,
0.07-m
Camera lens + CCD);
   
23.84,
12.4,
1.5'
(P. Camilleri,
0.406-m
Newtonian);
   
23.80,
11.0,
8.5'
(C. Hergenrother,
remote iTelescopes T08,
0.106-m
Refractor + CCD);
   
21.85,
12.6,
2'
(P. Camilleri,
0.406-m
Newtonian);
   
20.33,
13.2,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
20.16,
11.1,
9.1'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD);
   
20.13,
11.1,
1.8'
(C. Harder,
Capricorn Restcamp, NAM,
0.508-m
Newtonian);
   
19.17,
10.5,
--
(G. Pappa,
Namibia (remote control),
0.106-m
Refractor + CCD);
   
18.32,
13.4,
1'
(J. de Souza Aguiar,
0.3-m
Newtonian);
   
16.85,
13.0,
1'
(P. Camilleri,
0.406-m
Newtonian);
C/2021 Y1 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
30.75,
13.6,
3'
(T. Lehmann,
Hakos (remote),
0.2-m
Newtonian + CCD;
0.07° tail in p.a. 333 deg);
   
19.74,
13.4,
3.5'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD;
0.07° tail in p.a. 339 deg);
C/2022 A2 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
31.73,
12.1,
1.3'
(O. Miyazaki,
0.32-m
Newtonian);
   
31.06,
11.8,
0.9'
(W. Hasubick,
0.44-m
Newtonian);
   
31.03,
11.0,
6.7'
(T. Lehmann,
Weimar,
0.279-m
Newtonian + CCD;
0.1° tail in p.a. 339 deg);
   
31.00,
11.4,
2.7'
(M. Paradowski,
Dabrowa, Poland,
0.034-m
Camera lens + CCD);
   
29.13,
11.6,
2.3'
(P. Carson,
PGC Observatory Z10, Fregenal de la sierra, Spain,
0.315-m
Cassegrain reflector + CCD);
   
25.76,
11.4,
2.5'
(K. Harikae,
0.15-m
Newtonian + CCD);
   
24.71,
11.3,
1.6'
(O. Miyazaki,
0.32-m
Newtonian);
   
24.44,
10.7,
9'
(T. Lehmann,
Utah (remote),
0.106-m
Refractor + CCD;
0.14° tail in p.a. 328 deg);
   
23.75,
11.6,
1.7'
(O. Miyazaki,
0.32-m
Newtonian);
   
18.08,
11.6,
1.8'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD);
   
17.74,
11.8,
1.7'
(O. Miyazaki,
0.32-m
Newtonian);
   
16.75,
11.5,
1.2'
(O. Miyazaki,
0.32-m
Newtonian);
   
16.09,
11.2,
2.9'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD);
   
15.12,
10.8,
2'
(C. Labordena,
La Serra d Engarcera,
0.2-m
Schmidt-Cassegrain);
C/2022 E2 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
19.79,
15.8,
0.7'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD;
0.9'
tail in p.a. 129 deg);
C/2022 E3 (ZTF)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
30.74,
12.5,
3'
(T. Lehmann,
Hakos (remote),
0.2-m
Newtonian + CCD;
0.13° tail in p.a. 62 deg);
   
21.74,
12.2,
3.9'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD;
0.28° tail in p.a. 49 deg);
C/2022 JK5 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
24.06,
16.7,
--
(G. Pappa,
Namibia (remote control),
0.5-m
Prime focus of a reflector + CCD);
C/2022 L2 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
jun
04.97,
15.4,
1.2'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD;
0.9'
tail in p.a. 70 deg);
   
02.96,
15.8,
1.1'
(M. Lošťák,
0.2-m
Newtonian + CCD);
may
31.00,
15.4,
1'
(T. Lehmann,
Weimar,
0.279-m
Newtonian + CCD;
1'
tail in p.a. 70 deg);
   
28.92,
16.1,
0.9'
(M. Lošťák,
0.2-m
Newtonian + CCD);
   
25.02,
15.5,
0.2'
(J. Chambó Bris,
Valles, Valencia, Spain,
0.2-m
Newtonian + CCD);
   
24.97,
15.5,
1.2'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD;
0.7'
tail in p.a. 76 deg);
   
22.03,
15.8,
--
(G. van Buitenen,
Dordrecht, NL (G06),
0.203-m
Ritchey-Chretien + CCD);
   
20.04,
15.7,
0.8'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD;
1'
tail in p.a. 71 deg);
   
14.02,
15.5,
1.6'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD;
0.8'
tail in p.a. 65 deg);
   
13.99,
15.4,
0.48'
(S. Shurpakov,
0.41-m
Newtonian + CCD;
0.8'
tail in p.a. 72 deg);
C/2022 P1 (NEOWISE)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
19.92,
14.7,
2.7'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD;
0.06° tail in p.a. 111 deg);
C/2022 U2 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
19.77,
16.8,
1.1'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD);
C/2022 U4 (Bok)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
13.93,
18.9,
0.19'
(S. Shurpakov,
0.41-m
Newtonian + CCD);
C/2022 W3 (Leonard)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
jun
05.00,
15.7,
0.7'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD);
may
28.02,
14.7,
1.8'
(T. Lehmann,
Weimar,
0.279-m
Newtonian + CCD;
1.3'
tail in p.a. 11 deg);
C/2023 A3 (Tsuchinshan-ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
jun
05.91,
16.7,
0.19'
(S. Shurpakov,
0.41-m
Newtonian + CCD);
   
04.89,
17.2,
0.6'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD);
may
28.32,
17.1,
--
(D. Heggie,
UDRO, Utah,
0.15-m
Refractor + CCD);
   
27.90,
16.9,
0.4'
(T. Lehmann,
Weimar,
0.279-m
Newtonian + CCD);
   
25.91,
17.2,
0.6'
(M. Lošťák,
0.2-m
Newtonian + CCD);
   
24.94,
16.9,
0.5'
(T. Lehmann,
Weimar,
0.279-m
Newtonian + CCD);
   
24.93,
16.3,
0.2'
(J. Chambó Bris,
Valles, Valencia, Spain,
0.2-m
Newtonian + CCD);
   
24.88,
17.4,
0.6'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD);
   
22.97,
16.5,
0.33'
(S. Shurpakov,
0.2-m
Schmidt-Newtonian + CCD);
   
21.96,
16.4,
--
(G. van Buitenen,
Dordrecht, NL (G06),
0.203-m
Ritchey-Chretien + CCD);
   
21.63,
16.5,
0.3'
(K. Yoshimoto,
0.203-m
Ritchey-Chretien + CCD);
   
21.00,
17.0,
0.4'
(T. Lehmann,
Hakos (remote),
0.106-m
Refractor + CCD);
   
18.10,
16.7,
--
(J. Maikner,
Comet Hunter Observatory 2,
0.305-m
Hyperboloid astro-camera + CCD);
   
18.01,
17.0,
0.4'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD;
0.2'
tail in p.a. 135 deg);
   
16.97,
16.9,
0.4'
(C. Hergenrother,
Skygems Obs, Hakos, Namibia,
0.5-m
Ritchey-Chretien + CCD;
6" tail in p.a. 120 deg);
   
15.99,
16.9,
0.8'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD;
0.4'
tail in p.a. 119 deg);
   
14.97,
16.7,
0.4'
(M. Phillips,
Forthimage Observatory, Edinburgh UK,
0.25-m
Newtonian + CCD);
   
14.05,
16.4,
0.8'
(P. Dekelver,
0.3-m
Newtonian + CCD);
   
13.99,
17.0,
0.7'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD);
   
13.85,
16.9,
0.24'
(S. Shurpakov,
0.41-m
Newtonian + CCD);
C/2023 B2 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
25.91,
16.2,
0.5'
(G. van Buitenen,
Dordrecht, NL (G06),
0.203-m
Ritchey-Chretien + CCD);
   
17.87,
15.1,
1.2'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD);
   
09.88,
14.5,
2'
(M. Jager,
G00 AZM Martinsberg, Austria,
0.305-m
Newtonian + CCD);
C/2023 C2 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
13.83,
17.5,
--
(G. Pappa,
Namibia (remote control),
0.2-m
Newtonian + CCD);
C/2023 E1 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
jun
07.50,
11.8,
1.5'
(O. Miyazaki,
0.32-m
Newtonian);
   
04.93,
10.5,
12'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD);
   
03.96,
10.5,
13'
(T. Lehmann,
Weimar,
0.279-m
Newtonian + CCD);
   
02.92,
11.7,
4.2'
(M. Lošťák,
0.2-m
Newtonian + CCD);
may
31.70,
11.5,
2'
(O. Miyazaki,
0.32-m
Newtonian);
   
30.96,
11.0,
5'
(M. Paradowski,
Dabrowa, Poland,
0.034-m
Camera lens + CCD);
   
30.91,
10.6,
1.4'
(W. Hasubick,
0.44-m
Newtonian);
   
28.88,
11.8,
5.5'
(M. Lošťák,
0.2-m
Newtonian + CCD);
   
27.93,
12.5,
3.01'
(N. James,
0.28-m
Schmidt-Cassegrain + CCD);
   
25.89,
10.8,
12'
(T. Lehmann,
Weimar,
0.279-m
Newtonian + CCD);
   
25.87,
11.8,
6.6'
(M. Lošťák,
0.2-m
Newtonian + CCD);
   
24.96,
11.3,
5.5'
(J. Chambó Bris,
Valles, Valencia, Spain,
0.2-m
Newtonian + CCD);
   
24.93,
10.8,
12'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD);
   
24.49,
12.9,
1.6'
(O. Miyazaki,
0.32-m
Newtonian);
   
22.93,
14.0,
1.67'
(S. Shurpakov,
0.2-m
Schmidt-Newtonian + CCD);
   
22.35,
11.0,
12'
(T. Lehmann,
Utah (remote),
0.106-m
Refractor + CCD);
   
21.99,
11.5,
3'
(G. Pappa,
Piemonte,Italy (remote control),
0.2-m
Newtonian + CCD);
   
21.92,
11.0,
8'
(P. Guzik,
25x100
Binoculars);
   
21.91,
12.2,
4.5'
(G. van Buitenen,
Dordrecht, NL (G06),
0.203-m
Ritchey-Chretien + CCD);
   
21.53,
11.1,
7.9'
(K. Yoshimoto,
0.203-m
Ritchey-Chretien + CCD);
   
20.21,
13.7,
4'
(D. Heggie,
UDRO, Utah,
0.15-m
Refractor + CCD);
   
17.48,
12.8,
1.5'
(O. Miyazaki,
0.32-m
Newtonian);
   
16.89,
11.1,
12'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD);
   
16.50,
13.1,
2'
(O. Miyazaki,
0.32-m
Newtonian);
   
15.90,
11.3,
5'
(C. Labordena,
Atzaneta,
0.2-m
Schmidt-Cassegrain);
   
15.49,
13.4,
2.7'
(K. Yoshimoto,
0.203-m
Ritchey-Chretien + CCD);
   
14.01,
14.1,
2'
(P. Dekelver,
0.3-m
Newtonian + CCD);
   
13.95,
11.4,
13'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD);
   
13.94,
14.0,
1.2'
(S. Shurpakov,
0.41-m
Newtonian + CCD);
   
12.94,
10.8,
7'
(J. Gonzalez Suarez,
0.203-m
Schmidt-Cassegrain);
   
12.90,
15.5,
0.48'
(S. Shurpakov,
0.2-m
Schmidt-Newtonian + CCD);
   
11.59,
12.6,
1.2'
(O. Miyazaki,
0.32-m
Newtonian);
   
10.92,
11.5,
6'
(P. Guzik,
25x100
Binoculars);
   
10.91,
12.7,
4'
(M. Paradowski,
0.034-m
Camera lens + CCD);
   
10.48,
13.6,
1'
(O. Miyazaki,
0.32-m
Newtonian);
   
09.90,
12.5,
3'
(P. Guzik,
0.326-m
Newtonian);
   
09.90,
10.8,
11'
(S. Fritsche,
Koeditz,
0.1-m
Refractor + CCD);
   
09.90,
11.7,
9'
(M. Jager,
G00 AZM Martinsberg, Austria,
0.305-m
Newtonian + CCD);
   
09.49,
13.5,
1.1'
(O. Miyazaki,
0.32-m
Newtonian);
C/2023 H1 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
17.77,
19.5,
--
(G. Pappa,
Namibia (remote control),
0.5-m
Prime focus of a reflector + CCD);
P/2014 OL465 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
21.83,
18.4,
--
(G. Pappa,
Namibia (remote control),
0.5-m
Prime focus of a reflector + CCD);
P/2018 HT3 (NEOWISE)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may
14.76,
16.9,
--
(G. Pappa,
Namibia (remote control),
0.2-m
Newtonian + CCD);