comet 21P/GIACOBINI-ZINNER

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Observation date	image	Photometry (FOCAS)	Afρ	astrometry	Observatory
20180603	X	X		X	B96 (BRIXIIS)
20180604	X	X		X	B96 (BRIXIIS)
20180605	X	X	X	X	B96 (BRIXIIS)
20180609	X	X	X	X	B96 (BRIXIIS)
20180618	X	X	X	X	B96 (BRIXIIS)
20180621 - 01:00 UT	X	X	X	X	B96 (BRIXIIS)
20180621 - 23:30 UT	X	X	X	X	B96 (BRIXIIS)
20180625	X	X	X	X	B96 (BRIXIIS)
20180627 - 00:43 UT	X	X	X	X	B96 (BRIXIIS)
20180627 - 23:48 UT	X	X	X	X	B96 (BRIXIIS)
20180629	X	X	X	X	B96 (BRIXIIS)
20180702 - 00:17 UT	X	X	X	X	B96 (BRIXIIS)
20180702 - 23:37 UT	X	X	X	X	B96 (BRIXIIS)
20180705	X	X	X	X	B96 (BRIXIIS)
20180706	X	X	X	X	B96 (BRIXIIS)
20180707	X	X	X	X	B96 (BRIXIIS)
20180708	X	X	X	X	B96 (BRIXIIS)
20180712	X	X	X	X	B96 (BRIXIIS)
20180713	X	X	X	X	B96 (BRIXIIS)
20180714	X	X	X	X	B96 (BRIXIIS)
20180716	X	X	X	X	B96 (BRIXIIS)
20180717	X	X	X	X	B96 (BRIXIIS)
20180718	X	X	X	X	B96 (BRIXIIS)
20180721	X	X	X	X	B96 (BRIXIIS)
20180723	X	X	X	X	B96 (BRIXIIS)
20180801	X	X		X	B96 (BRIXIIS)
20180802	X	X	X	X	B96 (BRIXIIS)
20180803	X	X	X	X	B96 (BRIXIIS)
20180805	X	X	X	X	B96 (BRIXIIS)
20180806	X	X	X	X	B96 (BRIXIIS)
20180808	X	X	X	X	B96 (BRIXIIS)
20180813	X	X	X	X	B96 (BRIXIIS)
20180814	X	X	X	X	H06 - New Mexico
20180817	X	X	X	X	B96 (BRIXIIS)
20180822	X	X	X	X	B96 (BRIXIIS)
20180831	X	X	X	X	B96 (BRIXIIS)
20180901	X	X	X	X	B96 (BRIXIIS)
20180902	X	X	X	X	B96 (BRIXIIS)
20180913	X	X	X	X	H06 - New Mexico
20180925	X	X	X	X	B96 (BRIXIIS)

21P/GIACOBINI-ZINNER

Photometric data obtained by use of FOCAS-II software

10x10 20x20 30x30 40x40 50x50 60x60 SNR SB COD

OBJECT DATE TIME +/- +/- +/- +/- +/- +/- N FWHM CAT

------------ ---------- -------- ----- ----- ----- ----- ----- ----- ---- ---- ---

21P 03/06/2018 22:17:15 14.84 14.09 13.73 13.54 13.49 13.47 5.9 15.1 B96

21P 03/06/2018 22:17:15* 0.10 0.13 0.11 0.01 0.04 0.06 2 3.8 CMC

21P 04/06/2018 23:18:30 14.80 14.19 13.88 13.70 13.62 13.60 25.6 16.5 B96

21P 04/06/2018 23:18:30* 0.03 0.02 0.03 0.02 0.02 0.03 6 3.8 USN

21P 05/06/2018 22:45:30 14.91 14.34 14.07 13.91 13.83 13.81 22.7 16.6 B96

21P 05/06/2018 22:45:30* 0.05 0.06 0.06 0.06 0.07 0.08 10 3.3 CMC

21P 09/06/2018 22:38:35 14.78 14.17 13.90 13.71 13.65 11.4 15.0 B96

21P 09/06/2018 22:38:35* 0.03 0.10 0.10 0.08 0.14 10 3.5 CMC

21P 18/06/2018 23:23:49 14.14 13.51 13.20 12.99 12.83 12.71 17.3 17.9 B96

21P 18/06/2018 23:23:49* 0.07 0.10 0.09 0.08 0.08 0.08 22 4.2 CMC

21P 21/06/2018 00:47:24 14.21 13.51 13.18 12.98 12.83 12.73 33.5 18.1 B96

21P 21/06/2018 00:47:24* 0.01 0.03 0.04 0.05 0.05 0.06 22 3.3 CMC

21P 21/06/2018 23:23:59 14.08 13.39 13.05 12.83 12.66 12.54 25.5 18.0 B96

21P 21/06/2018 23:23:59* 0.14 0.14 0.11 0.09 0.08 0.07 22 3.9 CMC

21P 25/06/2018 23:45:16 13.93 13.22 12.89 12.67 12.51 12.40 32.0 18.0 B96

21P 25/06/2018 23:45:16* 0.05 0.07 0.05 0.05 0.04 0.04 22 3.4 CMC

21P 27/06/2018 23:48:56 13.74 13.05 12.72 12.49 12.31 12.18 33.8 17.1 B96

21P 27/06/2018 23:48:56* 0.24 0.17 0.14 0.12 0.11 0.10 16 3.6 CMC

21P 27/06/2018 00:43:50 13.85 13.12 12.78 12.56 12.40 12.28 31.2 17.7 B96

21P 27/06/2018 00:43:50* 0.02 0.02 0.03 0.04 0.04 0.05 24 3.7 USN

21P 28/06/2018 23:40:53 13.77 13.05 12.71 12.49 12.32 12.20 34.5 17.4 B96

21P 28/06/2018 23:40:53* 0.02 0.02 0.03 0.04 0.04 0.05 24 3.7 CMC

21P 29/06/2018 23:35:59 13.67 12.95 12.58 12.35 12.16 12.01 36.9 17.4 B96

21P 29/06/2018 23:35:59* 0.14 0.13 0.10 0.09 0.07 0.06 22 3.4 CMC

21P 30/06/2018 23:38:58 13.62 12.88 12.52 12.29 12.11 11.98 33.9 17.7 B96

21P 30/06/2018 23:38:58* 0.01 0.03 0.04 0.05 0.05 0.05 18 3.9 CMC

21P 02/07/2018 00:14:21 13.72 12.96 12.63 12.42 12.26 12.14 21.9 18.0 B96

21P 02/07/2018 00:14:21* 0.02 0.04 0.04 0.05 0.05 0.04 6 3.9 USN

21P 02/07/2018 23:37:24 13.63 12.90 12.55 12.31 12.14 12.01 31.3 18.0 B96

21P 02/07/2018 23:37:24* 0.02 0.04 0.04 0.05 0.05 0.06 24 3.8 USN

21P 05/07/2018 23:22:05 13.85 13.11 12.75 12.52 12.35 12.21 43.9 18.3 B96

21P 05/07/2018 23:22:05* 0.01 0.01 0.01 0.01 0.01 0.01 4 3.2 USN

21P 07/07/2018 23:39:42 13.68 12.93 12.56 12.32 12.15 12.01 42.3 17.6 B96

21P 07/07/2018 23:39:42* 0.02 0.03 0.03 0.03 0.04 0.04 30 3.1 USN

21P 08/07/2018 23:27:54 13.62 12.86 12.44 12.14 11.93 11.79 40.4 18.6 B96

21P 08/07/2018 23:27:54* 0.01 0.01 0.13 0.19 0.20 0.20 19 3.4 USN

21P 12/07/2018 22:35:45 13.06 12.29 11.91 11.66 11.49 11.35 40.8 18.0 B96

21P 12/07/2018 22:35:45* 0.00 0.00 0.01 0.01 0.01 0.01 8 3.5 USN

21P 13/07/2018 23:26:24 13.01 12.23 11.84 11.59 11.42 11.28 39.9 18.0 B96

21P 13/07/2018 23:26:24* 0.01 0.02 0.02 0.03 0.03 0.03 31 3.3 USN

21P 14/07/2018 23:32:28 12.90 12.10 11.70 11.45 11.26 11.12 36.8 18.4 B96

21P 14/07/2018 23:32:28* 0.02 0.02 0.03 0.03 0.04 0.04 31 3.7 USN

21P 16/07/2018 23:06:35 12.58 11.81 11.43 11.20 11.03 10.90 41.3 17.5 B96

21P 16/07/2018 23:06:35* 0.01 0.01 0.01 0.01 0.01 0.01 10 3.6 USN

21P 17/07/2018 23:34:15 12.82 12.04 11.63 11.37 11.19 11.05 35.7 18.4 B96

21P 17/07/2018 23:34:15* 0.05 0.04 0.03 0.02 0.02 0.02 16 3.6 USN

21P 18/07/2018 23:15:08 12.80 11.98 11.57 11.31 11.12 10.98 37.8 18.1 B96

21P 18/07/2018 23:15:08* 0.01 0.02 0.02 0.03 0.03 0.03 32 3.5 USN

21P 21/07/2018 22:20:21 12.98 12.19 11.79 11.53 11.35 11.20 44.7 17.7 B96

21P 21/07/2018 22:20:21* 0.01 0.04 0.04 0.04 0.05 0.04 8 3.3 USN

21P 23/07/2018 23:27:29 12.79 11.96 11.55 11.28 11.09 10.94 44.7 18.0 B96

21P 23/07/2018 23:27:29* 0.01 0.01 0.01 0.02 0.02 0.03 34 3.1 USN

21P 01/08/2018 21:58:33 12.13 11.28 10.84 10.57 10.37 10.22 31.4 17.0 B96

21P 01/08/2018 21:58:33* 0.02 0.02 0.02 0.01 0.02 0.01 7 3.3 USN

21P 02/08/2018 23:15:21 11.90 11.06 10.63 10.34 10.14 9.99 33.7 17.6 B96

21P 02/08/2018 23:15:21* 0.02 0.03 0.03 0.02 0.02 0.02 36 3.1 USN

21P 03/08/2018 23:23:54 11.93 11.06 10.62 10.33 10.13 9.97 31.1 17.8 B96

21P 03/08/2018 23:23:54* 0.01 0.01 0.01 0.01 0.01 0.01 28 3.2 USN

21P 05/08/2018 23:38:07 11.57 10.71 10.26 9.97 9.76 9.61 35.3 18.2 B96

21P 05/08/2018 23:38:07* 0.01 0.01 0.02 0.02 0.02 0.02 30 3.1 USN

21P 06/08/2018 22:55:13 11.50 10.63 10.19 9.90 9.69 9.53 30.1 17.5 B96

21P 06/08/2018 22:55:13* 0.01 0.01 0.01 0.01 0.01 0.01 32 3.3 USN

21P 08/08/2018 21:49:47 11.40 10.55 10.11 9.81 9.61 9.45 36.0 17.6 B96

21P 08/08/2018 21:49:47* 0.01 0.01 0.01 0.01 0.01 0.01 33 3.2 USN

21P 13/08/2018 21:24:16 11.07 10.21 9.77 9.47 9.26 9.11 42.5 16.6 B96

21P 13/08/2018 21:24:16* 0.15 0.14 0.13 0.14 0.14 0.14 36 3.3 USN

21P 14/08/2018 10:21:48 10.89 10.01 9.55 9.26 9.04 8.88 26.6 18.8 H06

21P 14/08/2018 10:21:48* 0.00 0.01 0.01 0.01 0.01 0.01 6 2.9 USN

21P 17/08/2018 23:07:16 11.08 10.19 9.72 9.42 9.20 9.04 40.2 17.4 B96

21P 17/08/2018 23:07:16* 0.06 0.05 0.06 0.06 0.06 0.06 42 3.0 USN

21P 22/08/2018 21:23:39 11.25 10.35 9.86 9.55 9.33 9.16 40.9 16.5 B96

21P 22/08/2018 21:23:39* 0.01 0.01 0.01 0.01 0.01 0.01 20 3.3 USN

21P 31/08/2018 23:08:17 10.91 9.94 9.45 9.13 8.91 8.74 25.2 16.0 B96

21P 31/08/2018 23:08:17* 0.04 0.03 0.03 0.04 0.04 0.04 46 3.5 CMC

21P 02/09/2018 22:37:41 10.83 9.92 9.45 9.14 8.91 8.74 31.3 16.0 B96

21P 02/09/2018 22:37:41* 0.01 0.03 0.03 0.03 0.03 0.03 5 3.8 CMC

21P 13/09/2018 09:39:07 11.25 10.34 9.88 9.56 9.32 9.14 32.6 19.4 H06

21P 13/09/2018 09:39:07* 0.02 0.02 0.03 0.03 0.02 0.02 8 3.9 CMC

AFRHO LOG

COMET UTC DELTA r BOX " MAG RSR CM +/- AFRHO OBS

------------ ------------------- ----- ----- ----- ----- --- ----- ---- ----- ---

21P 03/06/2018 22:17:15 1.12 1.65 24.55 14.02 6 82 14 1.915 B96

21P 04/06/2018 23:18:30 1.11 1.64 24.82 14.09 26 74 3 1.869 B96

21P 05/06/2018 22:45:30 1.10 1.64 25.06 14.26 23 62 3 1.791 B96

21P 09/06/2018 22:38:35 1.06 1.60 26.11 14.04 11 66 6 1.822 B96

21P 18/06/2018 23:23:49 0.96 1.52 28.64 13.27 17 101 6 2.005 B96

21P 21/06/2018 00:47:24 0.94 1.50 29.26 13.26 34 95 3 1.978 B96

21P 21/06/2018 23:23:59 0.93 1.49 29.55 13.10 26 107 4 2.027 B96

21P 25/06/2018 23:45:16 0.90 1.45 30.81 12.91 32 111 3 2.046 B96

21P 27/06/2018 23:48:56 0.88 1.43 31.46 12.71 34 126 4 2.100 B96

21P 27/06/2018 00:43:50 0.89 1.44 31.15 12.80 31 119 4 2.077 B96

21P 28/06/2018 23:40:53 0.87 1.43 31.79 12.70 35 122 4 2.086 B96

21P 29/06/2018 23:35:59 0.86 1.42 32.13 12.55 37 135 4 2.131 B96

21P 30/06/2018 23:38:58 0.85 1.41 32.47 12.49 34 138 4 2.141 B96

21P 02/07/2018 00:14:21 0.84 1.40 32.83 12.61 22 120 5 2.080 B96

21P 05/07/2018 23:22:05 0.80 1.37 34.26 12.68 44 99 2 1.994 B96

21P 07/07/2018 23:39:42 0.79 1.35 35.02 12.46 42 112 3 2.050 B96

21P 08/07/2018 23:27:54 0.78 1.34 35.40 12.29 40 127 3 2.104 B96

21P 12/07/2018 22:35:45 0.75 1.31 37.00 11.76 41 180 4 2.256 B96

21P 13/07/2018 23:26:24 0.74 1.30 37.43 11.68 40 187 5 2.272 B96

21P 14/07/2018 23:32:28 0.73 1.29 37.86 11.52 37 209 6 2.320 B96

21P 16/07/2018 23:06:35 0.71 1.27 38.73 11.25 41 250 6 2.398 B96

21P 17/07/2018 23:34:15 0.70 1.27 39.19 11.42 36 207 6 2.315 B96

21P 18/07/2018 23:15:08 0.70 1.26 39.65 11.34 38 214 6 2.330 B96

21P 21/07/2018 22:20:21 0.67 1.23 41.06 11.53 45 162 4 2.210 B96

21P 23/07/2018 23:27:29 0.66 1.22 42.08 11.25 45 194 4 2.288 B96

21P 01/08/2018 21:58:33 0.59 1.16 47.07 10.42 31 300 10 2.477 B96

21P 02/08/2018 23:15:21 0.58 1.15 47.72 10.18 34 360 11 2.556 B96

21P 03/08/2018 23:23:54 0.57 1.14 48.34 10.15 31 356 11 2.551 B96

21P 05/08/2018 23:38:07 0.56 1.13 49.64 9.76 35 473 13 2.675 B96

21P 06/08/2018 22:55:13 0.55 1.12 50.28 9.67 30 495 16 2.695 B96

21P 08/08/2018 21:49:47 0.53 1.11 51.60 9.56 36 509 14 2.707 B96

21P 13/08/2018 21:24:16 0.50 1.09 55.15 9.14 43 623 15 2.795 B96

21P 14/08/2018 10:21:48 0.50 1.08 55.55 8.91 27 758 28 2.880 H06

21P 17/08/2018 23:07:16 0.47 1.07 58.18 9.02 40 608 15 2.784 B96

21P 22/08/2018 21:23:39 0.45 1.05 61.87 9.07 41 494 12 2.694 B96

21P 31/08/2018 23:08:17 0.41 1.02 67.74 8.52 25 648 26 2.812 B96

21P 02/09/2018 22:37:41 0.40 1.02 68.67 8.53 31 623 20 2.795 B96

21P 13/09/2018 09:39:07 0.39 1.01 70.14 8.91 33 415 13 2.618 H06

Comet 21P on Kronk’s cometography

Comet 21P is a periodic comet, which was discovered by Michel Giacobini (from Nice, France), who observed the comet in the constellation of Aquarius on December 20, 1900. It was recovered two passages later by Ernst Zinner (from Bamberg, Germany) while observing variable stars near Beta Scuti on October 23, 1913

Af(rho) data obtained from filtered images (CARA Approuch) are available,

please send a request to the CARA-coordinator if you are interested in these data

The Skylive: orbit of comet 21P/Giacobini-Zinner

Afρ versus days from perihelion (CARA)

The CARA collaboration is grateful to the observers that submitted their af(rho) data, and/or kindly agreed to the usage of their images