Electronic Telegram No. 5288 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/2023 O2 = P/2014 W1 (PANSTARRS) M. Rudenko, Minor Planet Center, has announced on MPEC 2023-Q142 the recovery by J. Maikner (New Ringgold, PA, USA) of comet P/2014 W1 (cf. CBET 4018) on images taken on Aug. 2 and 11 with a 0.305-m Astro-Physics Riccard Honders astrograph. Following a request from the Central Bureau, Maikner writes that the Aug. 2 images show a slight coma, and the Aug. 11 images show a "slight" tail about 0'.5 long. 2023 UT R.A. (2000) Decl. Mag. Observer Aug. 2.24329 1 15 45.11 +17 58 17.9 19.9 Maikner 2.26811 1 15 45.96 +17 58 25.5 20.1 " 2.29293 1 15 46.85 +17 58 33.5 19.9 " 11.24016 1 20 26.71 +18 41 33.3 19.8 " 11.26391 1 20 27.32 +18 41 40.1 19.8 " 11.28732 1 20 27.91 +18 41 46.2 19.8 " The MPC identified, in its "isolated tracklet file", four pre-recovery observations of this comet made on July 30.54-30.56 UT with the Pan-STARRS1 1.8-m Ritchey-Chretien reflector at Haleakala. Following a request for additional information by the Central Bureau, R. Weryk (Department of Physics and Astronomy, University of Western Ontario) confirms that it was not noticed to be a comet, but analysis of those images now shows a size of 1".5 (full- width-at-half-maximum) in 1".1 seeing with no obvious tail. Weryk adds that he has now identified the comet in additional Pan-STARRS images taken on 2023 June 22 and 29, July 29, and Aug. 22. The residuals for the recovery observations are +135" in R.A. and +35" in Decl. from the prediction by S. Nakano (CBAT) in NK 2909 (and ICQ's 2023 Comet Handbook), with a corresponding correction of Delta(T) = -0.14 day. The following linked orbital elements by Nakano are from 63 observations spanning 2014-2023 (mean residual 0".4). There have been no close approaches to major planets since 1925. Epoch = 2014 Aug. 11.0 TT T = 2014 Aug. 1.14065 TT Peri. = 150.36615 e = 0.3962170 Node = 247.24880 2000.0 q = 2.6622579 AU Incl. = 8.80881 a = 4.4092961 AU n = 0.10645110 P = 9.26 years Epoch = 2023 Dec. 2.0 TT T = 2023 Dec. 18.24429 TT Peri. = 152.04890 e = 0.3904004 Node = 246.18151 2000.0 q = 2.7287753 AU Incl. = 8.83911 a = 4.4763404 AU n = 0.10406853 P = 9.47 years Epoch = 2033 May 3.0 TT T = 2033 Apr. 30.95717 TT Peri. = 153.76934 e = 0.3999605 Node = 245.82544 2000.0 q = 2.6223762 AU Incl. = 8.90606 a = 4.3703390 AU n = 0.10787763 P = 9.14 years Epoch = 2042 July 15.0 TT T = 2042 July 3.21489 TT Peri. = 153.83092 e = 0.3987353 Node = 245.76536 2000.0 q = 2.6408099 AU Incl. = 8.89182 a = 4.3920923 AU n = 0.10707717 P = 9.20 years The following ephemeris by the undersigned from the above orbital elements uses photometric power-law parameters H = 13.0 and 2.5n = 10 for the magnitudes. Date TT R. A. (2000) Decl. Delta r Elong. Phase Mag. 2023 08 04 01 16.77 +18 07.5 2.411 2.866 106.3 19.9 19.5 2023 08 14 01 21.59 +18 52.9 2.276 2.848 114.4 18.9 19.3 2023 08 24 01 24.49 +19 25.6 2.150 2.830 122.9 17.4 19.2 2023 09 03 01 25.33 +19 43.4 2.037 2.814 132.0 15.4 19.0 2023 09 13 01 24.06 +19 44.3 1.939 2.799 141.7 12.9 18.9 2023 09 23 01 20.82 +19 26.7 1.861 2.785 151.7 9.8 18.8 2023 10 03 01 16.04 +18 50.7 1.805 2.773 161.6 6.5 18.7 2023 10 13 01 10.38 +17 58.5 1.775 2.762 169.5 3.8 18.7 2023 10 23 01 04.67 +16 54.6 1.772 2.753 168.0 4.3 18.6 2023 11 02 00 59.79 +15 45.8 1.795 2.745 159.1 7.4 18.7 2023 11 12 00 56.45 +14 39.2 1.844 2.739 148.7 10.8 18.7 2023 11 22 00 55.17 +13 41.1 1.916 2.734 138.4 13.9 18.8 2023 12 02 00 56.17 +12 56.1 2.006 2.731 128.5 16.4 18.9 2023 12 12 00 59.46 +12 26.3 2.112 2.729 119.0 18.4 19.0 2023 12 22 01 04.93 +12 12.5 2.231 2.729 110.0 19.8 19.1 2024 01 01 01 12.37 +12 13.6 2.357 2.730 101.6 20.7 19.2 2024 01 11 01 21.54 +12 28.0 2.489 2.733 93.6 21.0 19.3 2024 01 21 01 32.23 +12 53.8 2.624 2.738 86.0 21.0 19.5 2024 01 31 01 44.21 +13 28.6 2.760 2.744 78.8 20.6 19.6 2024 02 10 01 57.29 +14 10.3 2.894 2.751 71.9 19.9 19.7 2024 02 20 02 11.32 +14 56.9 3.025 2.760 65.2 19.0 19.8 2024 03 01 02 26.16 +15 46.2 3.151 2.771 58.8 17.8 19.9 2024 03 11 02 41.68 +16 36.5 3.272 2.782 52.6 16.5 20.0 2024 03 21 02 57.79 +17 26.3 3.386 2.796 46.5 15.0 20.1 2024 03 31 03 14.37 +18 14.0 3.492 2.810 40.7 13.4 20.2 NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2023 CBAT 2023 August 26 (CBET 5288) Daniel W. E. Green