comet 257P/CATALINA

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Observation date	image	Photometry (FOCAS)	Afρ	astrometry	Observatory
20130906	X	X		X	B96 (BRIXIIS)
20131026	X	X		X	B96 (BRIXIIS)
20200710	X	X		X	B96 (BRIXIIS)
20200720	X	X		X	B96 (BRIXIIS)
20200721	X	X		X	B96 (BRIXIIS)
20200803	X	X		X	B96 (BRIXIIS)
20200906	X	X		X	B96 (BRIXIIS)
20200913	X	X		X	B96 (BRIXIIS)
20200914	X	X		X	B96 (BRIXIIS)
20200918	X	X		X	B96 (BRIXIIS)
20200920	X	X		X	B96 (BRIXIIS)
20200921	X	X		X	B96 (BRIXIIS)
20201104	X	X		X	B96 (BRIXIIS)
20201106	X	X		X	B96 (BRIXIIS)

257P/Catalina = 2005 JY126 = 2012 F4

Photometric data obtained by use of FOCAS-II software

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

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

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

257P 10/07/2020 23:30:37 17.54 17.20 17.09 11.0 18.2 B96

257P 10/07/2020 23:30:37* 0.04 0.00 0.09 2 3.3 Gai

257P 20/07/2020 23:14:16 17.45 16.71 16.29 16.18 16.19 6.6 18.3 B96

257P 20/07/2020 23:14:16* 0.00 0.00 0.00 0.00 0.00 1 3.3 Gai

257P 21/07/2020 22:43:38 17.27 16.65 16.27 16.13 15.98 15.82 10.9 18.5 B96

257P 21/07/2020 22:43:38* 0.06 0.05 0.06 0.06 0.09 0.07 2 3.5 Gai

257P 06/09/2013 00:45:31 17.37 16.82 16.63 16.35 16.12 16.11 7.7 17.8 B96

257P 06/09/2013 00:45:31* 0.13 0.07 0.06 0.12 0.09 0.16 3 3.7 USN

257P 13/09/2020 20:46:58 17.53 17.25 17.29 10.4 18.1 B96

257P 13/09/2020 20:46:58* 0.03 0.19 0.24 2 3.1 Gai

257P 14/09/2020 21:09:50 17.74 17.10 17.19 8.2 17.2 B96

257P 14/09/2020 21:09:50* 0.00 0.00 0.00 1 4.2 Gai

257P 18/09/2020 19:24:00 17.72 17.50 17.57 7.9 17.6 B96

257P 18/09/2020 19:24:00* 0.17 0.04 0.02 2 3.8 Gai

257P 20/09/2020 19:23:25 17.61 17.29 17.38 10.9 17.7 B96

257P 20/09/2020 19:23:25* 0.08 0.10 0.09 2 3.8 Gai

257P 21/09/2020 19:10:11 17.60 17.46 17.41 6.5 17.3 B96

257P 21/09/2020 19:10:11* 0.09 0.05 0.14 3 3.8 Gai

257P 04/11/2020 20:14:04 18.10 17.99 18.03 4.1 17.3 B96

257P 04/11/2020 20:14:04* 0.11 0.38 0.35 3 3.8 Gai

257P 06/11/2020 20:08:40 17.91 17.36 17.30 17.34 17.40 6.0 17.7 B96

257P 06/11/2020 20:08:40* 0.12 0.30 0.44 0.43 0.11 2 3.5 Gai

AFRHO LOG

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

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

257P 10/07/2020 23:30:37 1.34 2.19 20.64 17.22 11 11 1 1.027 B96

257P 20/07/2020 23:14:16 1.29 2.18 21.38 16.73 7 15 2 1.189 B96

257P 21/07/2020 22:43:38 1.29 2.18 21.44 16.62 11 17 2 1.229 B96

257P 06/09/2013 00:45:31 1.35 2.25 20.48 16.84 8 16 2 1.208 B96

257P 13/09/2020 20:46:58 1.35 2.14 20.42 17.33 10 9 1 0.974 B96

257P 14/09/2020 21:09:50 1.36 2.14 20.33 17.28 8 10 1 0.997 B96

257P 18/09/2020 19:24:00 1.38 2.14 19.97 17.58 8 8 1 0.893 B96

257P 20/09/2020 19:23:25 1.39 2.14 19.77 17.41 11 9 1 0.971 B96

257P 21/09/2020 19:10:11 1.40 2.14 19.67 17.48 7 9 1 0.948 B96

257P 04/11/2020 20:14:04 1.83 2.18 15.11 18.05 4 9 2 0.962 B96

257P 06/11/2020 20:08:40 1.85 2.19 14.91 17.64 6 14 2 1.140 B96

Discovery:

Rik Hill reports his discovery of a comet on exposures taken on June 7.32 UT with the 0.68-m Schmidt telescope in the course of the Catalina Sky Survey, noting the object to be less distinct than surrounding stars and elongated along a northeast-southwest axis. Magnitude about 18. C. W. Hergenrother, Lunar and Planetary Laboratory, writes that a co-added 1200-s R-band exposure with the University of Arizona 1.54-m Kuiper telescope shows the object to have a condensed, circular 15” coma and a thin, faint tail 35” long in p.a. 65°. The observations were linked by the Minor Planet Center to the apparently asteroidal object 2005 JY126, a Catalina discovery published on MPS 134992

Recovery:

G. Sostero, N. Howes, A. Tripp, E. Guido recovered comet 2005 JY126 (P/Catalina) using the 2.0-m Siding Spring-Faulkes Telescope South on 2012 March 21.60. This comet is later numbered as comet 257P/CATALINA.

Last upddated: 2020-11-01