Electronic Telegram No. 5175 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 R5 (PANSTARRS) Yudish Ramanjooloo, Institute for Astronomy, University of Hawaii, reports the discovery of another comet in images obtained with the Pan-STARRS2 1.8-m Ritchey-Chretien reflector at Haleakala on Sept. 8.6 UT (discovery observations tabulated below). Four 45-s w-band exposures show a diffuse coma of size 2".4 (full-width-at-half-maximum) in 1".5-1".6 seeing, with a fan-like tail about 7".9 long and about 1".7 wide towards p.a. 259 deg. 2022 UT R.A. (2000) Decl. Mag. Sept. 8.60069 3 14 09.32 - 3 30 03.9 21.3 8.60842 3 14 09.44 - 3 30 06.5 21.0 8.61620 3 14 09.59 - 3 30 09.2 21.6 8.62396 3 14 09.71 - 3 30 11.8 21.3 R. Weryk, Department of Physics and Astronomy, University of Western Ontario, reports that R. Wainscoat and he obtained four 60-s gri-band follow-up images on Sept. 22.51 UT with the 3.6-m Canada-France-Hawaii Telescope at Mauna Kea (queue observer A. Acohido; queue coordinator E. Bertin), which show a very condensed coma of size 0".7 (FWHM) in 0".5 seeing and a tail about 30" long in p.a. 265 degrees. Weryk adds that two 60-s w-band follow-up exposures taken on Sept. 23.6 with the Pan-STARRS1 1.8-m Ritchey-Chretien reflector at Haleakala show a very condensed coma of size 1".6 in 1".4 seeing, with a tail > 14" long in p.a. 265 degrees. Twelve stacked 120-s CCD exposures taken remotely on Sept. 23.47 by H. Sato (Bunkyo-ku, Tokyo, Japan) using a 0.43-m f/6.8 astrograph at Mayhill, NM, USA, show a stellar head with a straight tail 20" long toward p.a. 265 degrees; the magnitude was 20.8 as measured within a circular aperture of radius 5".7. The available astrometry appears on MPEC 2022-T88. The following elliptical orbital elements by S. Nakano (Central Bureau) are from 25 observations spanning 2022 Sept. 8-Oct. 4 (mean residual 0".5). Nakano was unable to find additional observations of this comet in archival astrometry in past years, and this comet does not appear to have made any close approaches to major planets in the past. T = 2022 May 28.01727 TT Peri. = 240.73238 e = 0.1955104 Node = 115.05715 2000.0 q = 2.4696686 AU Incl. = 15.29133 a = 3.0698578 AU n = 0.18324270 P = 5.379 years The following ephemeris by the undersigned from the above orbital elements uses photometric power-law parameters H = 15.0 and 2.5n = 10 for the magnitudes. Date TT R. A. (2000) Decl. Delta r Elong. Phase Mag. 2022 09 18 03 16.08 -04 25.1 1.801 2.528 126.2 18.7 20.3 2022 09 28 03 15.47 -05 28.2 1.731 2.539 134.8 16.3 20.2 2022 10 08 03 12.14 -06 30.2 1.678 2.550 143.2 13.6 20.2 2022 10 18 03 06.42 -07 24.2 1.646 2.562 150.7 11.0 20.2 2022 10 28 02 58.93 -08 02.9 1.637 2.574 155.5 9.2 20.2 2022 11 07 02 50.61 -08 20.0 1.653 2.588 155.5 9.1 20.2 2022 11 17 02 42.51 -08 12.1 1.693 2.601 150.8 10.7 20.3 2022 11 27 02 35.59 -07 39.0 1.758 2.616 143.2 13.1 20.4 2022 12 07 02 30.62 -06 43.2 1.844 2.631 134.5 15.5 20.5 2022 12 17 02 27.97 -05 29.0 1.949 2.646 125.7 17.6 20.7 2022 12 27 02 27.78 -04 01.0 2.069 2.662 116.9 19.2 20.8 2023 01 06 02 29.98 -02 23.5 2.200 2.679 108.5 20.4 21.0 2023 01 16 02 34.36 -00 40.4 2.339 2.696 100.4 21.0 21.2 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 5175) Daniel W. E. Green