Electronic Telegram No. 5179 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 C/2022 S3 (PANSTARRS) R. Weryk, Department of Physics and Astronomy, University of Western Ontario, reports the discovery of another comet in images obtained with the Pan-STARRS1 1.8-m Ritchey-Chretien reflector at Haleakala, Hawaii (discovery observations tabulated below). 2022 UT R.A. (2000) Decl. Mag. Sept.19.25190 20 46 29.26 + 8 24 53.7 21.0 19.26328 20 46 28.10 + 8 24 26.9 21.2 19.27453 20 46 26.96 + 8 24 00.7 21.3 25.25616 20 37 06.96 + 4 24 10.1 20.8 25.26458 20 37 06.20 + 4 23 49.3 20.8 25.27297 20 37 05.44 + 4 23 28.9 21.8 25.39831 20 36 54.14 + 4 18 21.8 20.5 25.39899 20 36 54.07 + 4 18 20.0 20.6 Weryk 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. 26.24 UT (queue observer C. Wipper; queue coordinator E. Bertin), which show a very condensed coma of size 0".9 (full-width-at-half-maximum) in 0".6 seeing and a broad 2" tail spanning p.a. 50-100 degrees. Additional CFHT images obtained as above on Sept. 27.38 show a condensed coma of size 1" (FWHM) in 0".7 seeing with a broad 2" tail again spanning p.a. 50-100 degrees. Twenty stacked 60-s CCD exposures taken remotely by H. Sato (Bunkyo-ku, Tokyo, Japan) with a 0.43-m f/6.8 astrograph located at Mayhill, NM, USA, on Sept. 27.2 show only a stellar appearance in this comet; the magnitude was 20.2 as measured within a circular aperture of radius 5".7. The available astrometry appears on MPEC 2022-T122. The following parabolic orbital elements by S. Nakano (Central Bureau) are from 54 observations spanning Sept. 19-Oct. 9 (mean residual 0".4). These suggest that the comet will pass 0.60 AU from the earth in 2023 March. T = 2023 Jan. 21.68119 TT Peri. = 267.99495 Node = 157.33118 2000.0 q = 0.8379349 AU Incl. = 78.53499 The following ephemeris by the undersigned from the above orbital elements uses photometric power-law parameters H = 16.5 and 2.5n = 8 for the magnitudes. Date TT R. A. (2000) Decl. Delta r Elong. Phase Mag. 2022 09 18 20 48.57 +09 13.7 1.390 2.222 135.6 18.4 20.0 2022 09 23 20 40.51 +05 55.8 1.369 2.158 130.2 20.8 19.9 2022 09 28 20 33.22 +02 31.8 1.359 2.093 124.2 23.3 19.7 2022 10 03 20 26.82 -00 54.2 1.356 2.028 117.9 25.9 19.6 2022 10 08 20 21.38 -04 18.5 1.362 1.962 111.5 28.3 19.5 2022 10 13 20 16.97 -07 38.0 1.374 1.896 105.1 30.5 19.4 2022 10 18 20 13.58 -10 50.7 1.390 1.830 98.8 32.6 19.3 2022 10 23 20 11.22 -13 55.2 1.411 1.764 92.7 34.3 19.2 2022 10 28 20 09.88 -16 51.0 1.434 1.697 86.7 35.8 19.1 2022 11 02 20 09.53 -19 38.0 1.457 1.631 81.1 37.0 19.0 2022 11 07 20 10.10 -22 16.8 1.481 1.564 75.6 37.9 18.9 2022 11 12 20 11.57 -24 48.1 1.504 1.498 70.5 38.5 18.8 2022 11 17 20 13.89 -27 13.0 1.524 1.433 65.5 38.9 18.7 2022 11 22 20 17.03 -29 32.4 1.541 1.367 60.9 39.1 18.5 2022 11 27 20 20.97 -31 47.4 1.554 1.303 56.5 39.2 18.4 2022 12 02 20 25.67 -33 59.3 1.563 1.240 52.5 39.1 18.2 2022 12 07 20 31.13 -36 09.2 1.565 1.179 48.8 39.0 18.0 2022 12 12 20 37.34 -38 18.1 1.562 1.120 45.5 38.9 17.9 2022 12 17 20 44.32 -40 27.1 1.551 1.064 42.7 38.9 17.7 2022 12 22 20 52.13 -42 36.9 1.533 1.012 40.5 39.1 17.5 2022 12 27 21 00.84 -44 48.5 1.507 0.964 38.8 39.8 17.3 2023 01 01 21 10.57 -47 02.5 1.472 0.922 37.9 40.9 17.1 2023 01 06 21 21.52 -49 19.2 1.429 0.888 37.8 42.8 16.9 2023 01 11 21 34.00 -51 38.7 1.376 0.862 38.5 45.3 16.7 2023 01 16 21 48.52 -54 00.4 1.314 0.845 40.0 48.4 16.5 2023 01 21 22 05.86 -56 23.4 1.244 0.838 42.2 52.1 16.4 2023 01 26 22 27.19 -58 45.8 1.167 0.842 45.1 55.9 16.2 2023 01 31 22 54.30 -61 03.5 1.084 0.856 48.6 59.7 16.1 2023 02 05 23 29.78 -63 08.0 0.997 0.880 52.7 63.0 16.0 2023 02 10 00 16.82 -64 40.9 0.909 0.912 57.3 65.6 16.0 2023 02 15 01 17.53 -65 07.6 0.822 0.952 62.7 67.2 15.9 2023 02 20 02 28.87 -63 34.7 0.742 0.998 68.7 67.4 15.8 2023 02 25 03 40.53 -59 08.6 0.673 1.049 75.6 66.0 15.8 NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2022 CBAT 2022 October 12 (CBET 5179) Daniel W. E. Green