Electronic Telegram No. 5150 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 G2 = P/2012 O3 (McNAUGHT) This comet (cf. CBET 3193) was accidentally recovered in images obtained on June 28 with the Pan-STARRS2 1.8-m Ritchey-Chretien reflector at Haleakala and reported as a new (unknown object), which was identified automatically at the Minor Planet Center, with the single-night observations published on MPEC 2022-N37. Upon a request by the Central Bureau, R. Weryk (Department of Physics and Astronomy, University of Western Ontario) writes that the four 45-s w-band Pan-STARRS2 survey images do show a cometary appearance, with the comet's head having a size of 1".7 (full-width-at-half-maximum) in 1".5 seeing, adding that the point-spread function appears asymmetric, suggesting a short tail towards the west. As a result of those published observations on MPEC 2022-N37, Hidetaka Sato (Tokyo, Japan) was able to identify pre-recovery stellar images of the comet on twelve stacked 60-s CCD exposures taken remotely with a 0.51-m f/6.8 astrograph at Siding Spring, NSW, Australia; the magnitude was 20.9 as measured within a circular aperture of radius 4".4. The astrometry is tabulated below. 2022 UT R.A. (2000) Decl. Mag. Observer Apr. 10.79586 21 57 30.66 -22 48 32.7 Sato 10.80118 21 57 31.52 -22 48 26.3 20.9 " June 28.58263 1 00 07.05 + 7 25 52.6 20.9 Pan-STARRS2 28.58777 1 00 07.62 + 7 26 00.0 20.8 " 28.59282 1 00 08.15 + 7 26 07.1 20.8 " 28.59786 1 00 08.68 + 7 26 14.5 20.8 " The residuals of the recovery astrometry from the prediction in NK 3981 were +77" in R.A. and +76" in Decl., with an indicated correction of Delta(T) = -0.06 day. The following linked orbital elements by S. Nakano (Central Bureau) are from 313 observations spanning 2012-2022 (mean residual 0".5). There have been no recent close approaches to major planets, and no other observations were identified in a search of archival astrometry. Epoch = 2012 Aug. 21.0 TT T = 2012 Aug. 16.07168 TT Peri. = 343.64978 e = 0.6488102 Node = 336.99635 2000.0 q = 1.5994445 AU Incl. = 16.49662 a = 4.5543589 AU n = 0.10140589 P = 9.72 years Epoch = 2022 May 21.0 TT T = 2022 May 29.64522 TT Peri. = 344.75269 e = 0.6471187 Node = 336.41405 2000.0 q = 1.6139443 AU Incl. = 16.61576 a = 4.5736179 AU n = 0.10076606 P = 9.78 years Epoch = 2032 Feb. 18.0 TT T = 2032 Feb. 4.29539 TT Peri. = 344.07253 e = 0.6456844 Node = 336.14453 2000.0 q = 1.6203333 AU Incl. = 16.66515 a = 4.5731349 AU n = 0.10078202 P = 9.78 years Epoch = 2041 Nov. 17.0 TT T = 2041 Nov. 27.17969 TT Peri. = 346.35371 e = 0.6499689 Node = 335.25027 2000.0 q = 1.5834064 AU Incl. = 16.31281 a = 4.5236158 AU n = 0.10244140 P = 9.62 years The following ephemeris by the undersigned from the above orbital elements uses photometric power-law parameters H = 17.5 and 2.5n = 10 for the magnitudes. Date TT R. A. (2000) Decl. Delta r Elong. Phase Mag. 2022 06 30 01 02.67 +07 59.4 1.479 1.649 80.4 37.4 20.5 2022 07 10 01 19.77 +11 52.3 1.431 1.675 84.6 37.2 20.5 2022 07 20 01 35.04 +15 37.4 1.384 1.707 89.3 36.5 20.5 2022 07 30 01 48.13 +19 13.0 1.340 1.744 94.5 35.5 20.6 2022 08 09 01 58.60 +22 37.5 1.298 1.787 100.5 33.9 20.6 2022 08 19 02 05.98 +25 49.0 1.261 1.834 107.1 31.8 20.6 2022 08 29 02 09.74 +28 44.3 1.228 1.885 114.4 29.2 20.7 2022 09 08 02 09.45 +31 18.7 1.203 1.939 122.4 26.0 20.8 2022 09 18 02 05.03 +33 25.7 1.189 1.996 130.9 22.4 20.9 2022 09 28 01 56.81 +34 57.9 1.188 2.056 139.5 18.5 21.0 2022 10 08 01 45.91 +35 49.3 1.206 2.118 147.5 14.7 21.2 2022 10 18 01 34.01 +35 58.9 1.244 2.182 153.4 11.8 21.4 2022 10 28 01 22.93 +35 32.2 1.305 2.247 155.2 10.7 21.6 NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2022 CBAT 2022 July 12 (CBET 5150) Daniel W. E. Green