Electronic Telegram No. 5592 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/2025 O1 = P/2005 J1 (McNAUGHT) P. Veres, Minor Planet Center, reports that this comet was recovered accidentally as an apparently new asteroidal object on CCD images obtained on July 29 at San Pedro de Atacama, Chile, by A. Maury and F. Signoret with a 0.28-m f/2.2 reflector (recovery observations tabulated below). Maury, G. Attard, and Signoret obtained confirming observations on July 30 with a 0.50-m f/4 reflector at the same site. 2025 UT R.A. (2000) Decl. Mag. July 29.01519 14 18 58.32 -21 25 09.7 18.4 29.02147 14 18 59.47 -21 25 02.3 18.8 29.02773 14 19 00.60 -21 24 56.8 18.9 30.03956 14 22 10.02 -21 07 41.3 20.0 30.04516 14 22 11.04 -21 07 35.7 20.0 30.05080 14 22 11.98 -21 07 29.2 19.9 After the object was posted to the MPC's NEOCP webpage, additional confirming observations arrived from other observatories in the ensuing days, and the MPC identified it on July 31 with comet P/2005 J1 (cf. IAUC 8525), removing it then from the NEOCP. Additional astrometry appears on MPEC 2025-P120. The residuals for the recovery observations are -4'.8 in R.A. and -1'.1 in Decl. from the prediction on NK 1382 (and in the ICQ's 2025 Comet Handbook) with a corresponding correction of Delta(T) = +0.11 day. The following linked orbital elements by S. Nakano (Central Bureau) are from 104 observations spanning 2005 May 3-2025 Aug. 7 (mean residual 0".5). The comet passed 0.13 AU from Jupiter on 1989 Oct. 13; prior to that close approach, the comet had orbital elements T = 1983 Nov. 23, q = 2.0328 AU, e = 0.4964, Peri. = 325.4 deg, Node = 270.2 deg, i = 30.0 deg (equinox J2000.0), a = 4.0365 AU, P = 8.11 years. Epoch = 2005 Apr. 20.0 TT T = 2005 Apr. 17.30504 TT Peri. = 338.92192 e = 0.5709662 Node = 268.84109 2000.0 q = 1.5301375 AU Incl. = 31.76549 a = 3.5664733 AU n = 0.14633412 P = 6.74 years Epoch = 2012 Feb. 3.0 TT T = 2012 Jan. 15.62862 TT Peri. = 338.97385 e = 0.5698093 Node = 268.80462 2000.0 q = 1.5370531 AU Incl. = 31.73397 a = 3.5729579 AU n = 0.14593593 P = 6.75 years Epoch = 2018 Oct. 9.0 TT T = 2018 Oct. 12.63151 TT Peri. = 338.92465 e = 0.5703767 Node = 268.79586 2000.0 q = 1.5334460 AU Incl. = 31.76849 a = 3.5692805 AU n = 0.14616152 P = 6.74 years Epoch = 2025 July 24.0 TT T = 2025 July 11.25512 TT Peri. = 338.88159 e = 0.5694153 Node = 268.83018 2000.0 q = 1.5393146 AU Incl. = 31.73347 a = 3.5749408 AU n = 0.14581452 P = 6.76 years Epoch = 2032 Mar. 29.0 TT T = 2032 Apr. 10.92566 TT Peri. = 338.96127 e = 0.5708446 Node = 268.76583 2000.0 q = 1.5310618 AU Incl. = 31.80087 a = 3.5676165 AU n = 0.14626379 P = 6.74 years Epoch = 2039 Jan. 12.0 TT T = 2038 Dec. 23.75804 TT Peri. = 340.12332 e = 0.5814981 Node = 268.59558 2000.0 q = 1.4691138 AU Incl. = 32.05885 a = 3.5104117 AU n = 0.14985354 P = 6.58 years Epoch = 2045 Aug. 8.0 TT T = 2045 July 23.74486 TT Peri. = 340.26380 e = 0.5818247 Node = 268.52693 2000.0 q = 1.4669189 AU Incl. = 32.08668 a = 3.5079039 AU n = 0.15001426 P = 6.57 years The following ephemeris by the undersigned from the above orbital elements uses photometric power-law parameters H = 16.5 and 2.5n = 10.0 for the magnitudes (i.e., about 1 mag fainter than in 2005). Date TT R. A. (2000) Decl. Delta r Elong. Phase Mag. 2025 07 24 14 03.16 -22 54.0 1.071 1.545 95.5 40.9 18.5 2025 08 03 14 34.40 -20 02.5 1.147 1.558 92.0 40.6 18.7 2025 08 13 15 04.40 -17 33.2 1.236 1.577 88.5 40.0 18.9 2025 08 23 15 33.14 -15 24.9 1.335 1.602 85.0 39.0 19.2 2025 09 02 16 00.73 -13 34.7 1.443 1.634 81.5 37.7 19.4 2025 09 12 16 27.26 -11 58.8 1.558 1.670 78.0 36.1 19.7 2025 09 22 16 52.88 -10 33.7 1.678 1.712 74.6 34.4 20.0 2025 10 02 17 17.72 -09 15.8 1.804 1.757 71.1 32.6 20.2 2025 10 12 17 41.87 -08 01.9 1.932 1.806 67.6 30.7 20.5 2025 10 22 18 05.39 -06 49.4 2.063 1.858 64.1 28.8 20.8 2025 11 01 18 28.35 -05 36.2 2.195 1.913 60.6 26.9 21.0 NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2025 CBAT 2025 August 13 (CBET 5592) Daniel W. E. Green