Electronic Telegram No. 5141 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 J2 (BOK) [Editor's note: This text replaces that on CBET 5140 (new astrometry).] An apparently asteroidal object discovered in the course of the Bok survey in CCD images obtained with the Kitt Peak 2.25-m reflector, and designated A/2022 J2 when announced on MPEC 2022-K80 (discovery observations tabulated below), has been found to show cometary appearance in images taken on June 26.3 UT by K. J. Meech, E. Bufanda, J. Kleyna, and J. V. Keane with the 3.6-m Canada-France-Hawaii Telescope at Mauna Kea, with measurements by M. Micheli and Kleyna showing a coma of diameter about 2".5 (magnitude about 22) and a tail about 10" long in p.a. about 100 degrees in 1".0 seeing. 2022 UT R.A. (2000) Decl. Mag. Observer May 9.18802 12 49 21.49 +34 26 38.4 21.5 Meech 9.19294 12 49 20.62 +34 26 41.2 22.5 " 9.19785 12 49 19.68 +34 26 45.1 21.6 " 9.20276 12 49 18.72 +34 26 48.3 21.6 " 9.20730 12 49 17.85 +34 26 50.7 21.6 " 9.20819 12 49 17.65 +34 26 51.0 22.1 " 9.20908 12 49 17.50 +34 26 51.5 " 9.20998 12 49 17.34 +34 26 52.8 22.0 " The above-mentioned CFHT astrometry is tabulated below because it was not included on MPEC 2022-M98. 2022 UT R.A. (2000) Decl. Mag. Observer June 26.27737 11 08 29.51 +34 22 19.5 22.1 Meech 26.27997 11 08 29.35 +34 22 18.7 21.9 " The following unperturbed orbital elements by S. Nakano (Central Bureau) are from 48 observations spanning May 9-June 26 (mean residual 0".4) and indicate that the comet will pass 1.94 AU from Jupiter on 2023 Aug. 12 and 4.54 AU from Saturn in 2025 April. T = 2022 Oct. 27.16281 TT Peri. = 133.13461 e = 0.9794707 Node = 252.53832 2000.0 q = 1.8256468 AU Incl. = 149.08896 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 05 21 12 14.41 +35 47.3 2.216 2.655 104.4 21.7 21.6 2022 05 31 11 49.78 +35 58.6 2.328 2.574 92.1 23.2 21.6 2022 06 10 11 30.31 +35 35.9 2.452 2.494 80.5 23.7 21.6 2022 06 20 11 15.62 +34 53.9 2.576 2.416 69.6 23.2 21.6 2022 06 30 11 04.94 +34 02.6 2.691 2.341 59.3 21.9 21.6 2022 07 10 10 57.48 +33 08.7 2.790 2.269 49.7 20.0 21.6 2022 07 20 10 52.49 +32 16.0 2.867 2.200 40.8 17.6 21.5 2022 10 08 10 42.28 +29 31.8 2.369 1.842 47.1 23.4 20.5 2022 10 18 10 37.91 +30 16.8 2.165 1.829 57.3 27.3 20.3 2022 10 28 10 30.13 +31 33.1 1.938 1.826 68.5 30.4 20.0 2022 11 07 10 16.60 +33 31.4 1.697 1.831 81.3 32.4 19.7 2022 11 17 09 53.12 +36 23.0 1.454 1.844 96.2 32.2 19.4 2022 11 27 09 11.83 +40 05.2 1.231 1.866 114.2 28.8 19.1 2022 12 07 08 01.27 +43 25.4 1.059 1.896 136.1 21.1 18.8 NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2022 CBAT 2022 June 29 (CBET 5141) Daniel W. E. Green