Electronic Telegram No. 5176 Central Bureau for Astronomical Telegrams Mailing address: Hoffman Lab 209; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A. e-mail: cbatiau@eps.harvard.edu (alternate cbat@iau.org) URL http://www.cbat.eps.harvard.edu/index.html Prepared using the Tamkin Foundation Computer Network COMET P/2022 S1 (PANSTARRS) Yudish Ramanjooloo, Institute for Astronomy, University of Hawaii, reports the discovery of another comet in images obtained on Sept. 23 with the Pan-STARRS2 1.8-m Ritchey-Chretien reflector at Haleakala (discovery observations tabulated below); three 45-s w-band images each show a diffuse coma of size 1".8 (full-width-at-half-maximum) in 1".1-1".2 seeing, and no tail. 2022 UT R.A. (2000) Decl. Mag. Sept.14.57170 4 43 46.64 -17 58 10.2 20.4 14.58343 4 43 47.07 -17 58 16.1 21.0 23.59714 4 48 45.74 -19 14 00.9 20.5 23.60819 4 48 46.03 -19 14 06.7 20.4 23.63006 4 48 46.60 -19 14 17.9 20.7 R. Weryk, Department of Physics and Astronomy, University of Western Ontario, writes that he and R. Wainscoat obtained three 60-s gri-band follow-up images with the 3.6-m Canada-France-Hawaii Telescope at Mauna Kea on Sept. 26.62 UT (queue observer C. Wipper; queue coordinator E. Bertin), which show this to be definitely a comet; there is a condensed coma of size 0".8 (FWHM) in 0".5 seeing with a broad tail 3" long in p.a. 260-300 degrees. Weryk also identified pre-discovery observations obtained on Sept. 14.6 with the Pan-STARRS1 1.8-m Ritchey-Chretien reflector at Haleakala (at mag 20.5-21.0). Six stacked 120-s CCD exposures taken remotely by H. Sato (Bunkyo-ku, Tokyo, Japan) with a 0.51-m f/6.8 astrograph located at Rio Hurtado, Chile, show a strongly condensed coma 5" in diameter with no tail; the magnitude was 19.9 as measured within a circular aperture of radius 2".9. The available astrometry appears on MPEC 2022-T89. The following elliptical orbital elements by S. Nakano (Central Bureau) are from 37 observations spanning Sept. 14-Oct. 3 (mean residual 0".2). No other observations were found in a search of archival astrometry from years past. It appears that this comet passed about 0.23 AU from Jupiter in 1991 July. The orbital uncertainty is estimated to be on the order of a month. T = 2022 Aug. 19.07762 TT Peri. = 262.74390 e = 0.5080314 Node = 136.07847 2000.0 q = 3.1507820 AU Incl. = 34.58030 a = 6.4044368 AU n = 0.06081107 P = 16.208 years The following ephemeris by the undersigned from the above orbital elements uses photometric power-law parameters H = 12.5 and 2.5n = 10 for the magnitudes. Date TT R. A. (2000) Decl. Delta r Elong. Phase Mag. 2022 09 18 04 45.86 -18 26.7 2.765 3.158 103.7 18.0 19.7 2022 09 28 04 50.59 -19 51.4 2.683 3.163 109.5 17.4 19.6 2022 10 08 04 53.19 -21 15.1 2.611 3.170 115.3 16.6 19.6 2022 10 18 04 53.59 -22 32.4 2.550 3.178 120.8 15.6 19.6 2022 10 28 04 51.80 -23 37.8 2.503 3.187 125.8 14.7 19.5 2022 11 07 04 48.04 -24 24.8 2.471 3.199 129.9 13.8 19.5 2022 11 17 04 42.74 -24 47.9 2.457 3.211 132.7 13.1 19.5 2022 11 27 04 36.48 -24 42.8 2.462 3.225 133.8 12.8 19.5 2022 12 07 04 30.01 -24 07.8 2.487 3.240 133.0 12.8 19.6 2022 12 17 04 24.06 -23 03.7 2.532 3.257 130.4 13.3 19.6 2022 12 27 04 19.27 -21 33.9 2.596 3.274 126.2 14.0 19.7 2023 01 06 04 16.12 -19 43.6 2.679 3.294 120.9 14.8 19.8 2023 01 16 04 14.83 -17 38.7 2.778 3.314 114.8 15.6 19.9 NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2022 CBAT 2022 October 6 (CBET 5176) Daniel W. E. Green