Electronic Telegram No. 5464 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/2024 T4 = P/2011 UA_134 (SPACEWATCH-PANSTARRS) M. Rudenko, Minor Planet Center, reports on MPEC 2024-U43 that comet P/2011 UA_134 (cf. IAUC 9239) has been accidentally recovered as an apparently asteroidal object in incidental astrometry obtained on Oct. 5 UT with the Mt. Lemmon 1.5-m reflector (observer J. K. Hogan) and on Oct. 9 and 10 with the Pan-STARRS2 1.8-m Ritchey-Chretien reflector at Haleakala (recovery astrometry tabulated below). 2024 UT R.A. (2000) Decl. Mag. Observer Oct. 5.30759 1 58 40.89 + 6 22 44.3 21.7 Hogan 5.31278 1 58 40.69 + 6 22 44.5 21.0 " 5.31797 1 58 40.50 + 6 22 44.8 20.8 " 5.32316 1 58 40.33 + 6 22 45.5 22.5 " 9.47124 1 56 09.38 + 6 28 35.4 21.8 Pan-STARRS2 9.49434 1 56 08.44 + 6 28 37.1 21.5 " 9.50592 1 56 07.95 + 6 28 38.1 21.6 " 10.45581 1 55 30.91 + 6 29 59.9 21.7 " 10.46795 1 55 30.40 + 6 30 00.6 21.4 " 10.48195 1 55 29.80 + 6 30 02.2 21.4 " 10.51364 1 55 28.48 + 6 30 04.1 21.7 " The residuals for the recovery observations are +0.60 deg in R.A. and +0.34 deg in Decl. from the prediction in NK 2207 and in the ICQ's 2024 Comet Handbook, with a corresponding correction of Delta(T) = -1.29 days. The following linked orbital elements by S. Nakano (Central Bureau) are from 136 observations spanning 2011 Oct. 24-2024 Oct. 10 (mean residual 0".6). The comet passed 0.90 AU from Jupiter on 1997 May 20 UT, 0.81 AU from Jupiter in 1922 September, and 1.76 AU from Saturn in 1928 February. Epoch = 1998 Dec. 13.0 TT T = 1998 Dec. 27.06535 TT Peri. = 32.36184 e = 0.6330232 Node = 41.34847 2000.0 q = 2.0189603 AU Incl. = 10.61456 a = 5.5016014 AU n = 0.07637837 P = 12.90 years Epoch = 2011 Dec. 25.0 TT T = 2011 Dec. 7.20483 TT Peri. = 32.32930 e = 0.6325168 Node = 40.63547 2000.0 q = 2.0513528 AU Incl. = 10.53802 a = 5.5821671 AU n = 0.07473083 P = 13.19 years Epoch = 2025 Feb. 14.0 TT T = 2025 Feb. 15.36967 TT Peri. = 32.41550 e = 0.6305637 Node = 40.38396 2000.0 q = 2.0752175 AU Incl. = 10.43802 a = 5.6172545 AU n = 0.07403173 P = 13.31 years Epoch = 2038 Apr. 7.0 TT T = 2038 Apr. 22.55155 TT Peri. = 32.16259 e = 0.6309925 Node = 40.33656 2000.0 q = 2.0579072 AU Incl. = 10.43314 a = 5.5768715 AU n = 0.07483730 P = 13.17 years Epoch = 2051 Mar. 10.0 TT T = 2051 Mar. 6.50313 TT Peri. = 32.23395 e = 0.6374958 Node = 39.28425 2000.0 q = 1.9810484 AU Incl. = 10.35424 a = 5.4648972 AU n = 0.07714914 P = 12.78 years The following ephemeris by the undersigned from the above orbital elements uses photometric power-law parameters H = 16.0 and 2.5n = 10 for the magnitudes. Date TT R. A. (2000) Decl. Delta r Elong. Phase Mag. 2024 09 27 02 02.64 +06 10.9 1.519 2.453 152.7 10.8 20.8 2024 10 07 01 57.69 +06 25.1 1.432 2.407 163.4 6.8 20.6 2024 10 17 01 50.90 +06 40.0 1.370 2.363 173.8 2.6 20.4 2024 10 27 01 43.12 +06 58.7 1.333 2.321 171.9 3.4 20.3 2024 11 06 01 35.50 +07 24.8 1.322 2.282 161.0 8.1 20.2 2024 11 16 01 29.27 +08 01.5 1.335 2.245 149.8 12.8 20.1 2024 11 26 01 25.37 +08 50.6 1.369 2.212 139.2 17.0 20.1 2024 12 06 01 24.43 +09 52.9 1.421 2.181 129.2 20.5 20.2 2024 12 16 01 26.71 +11 08.1 1.487 2.155 120.0 23.3 20.2 2024 12 26 01 32.15 +12 34.6 1.563 2.131 111.6 25.4 20.3 2025 01 05 01 40.55 +14 10.6 1.648 2.112 103.9 26.9 20.3 2025 01 15 01 51.65 +15 53.8 1.738 2.096 96.8 27.8 20.4 2025 01 25 02 05.16 +17 41.6 1.833 2.085 90.3 28.2 20.5 2025 02 04 02 20.81 +19 31.4 1.930 2.078 84.3 28.2 20.6 2025 02 14 02 38.36 +21 20.4 2.029 2.075 78.7 27.8 20.7 2025 02 24 02 57.58 +23 06.0 2.129 2.077 73.5 27.2 20.8 2025 03 06 03 18.30 +24 45.5 2.231 2.083 68.5 26.3 20.9 2025 03 16 03 40.30 +26 16.5 2.333 2.093 63.8 25.2 21.0 2025 03 26 04 03.40 +27 36.8 2.435 2.107 59.2 24.0 21.2 NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2024 CBAT 2024 October 23 (CBET 5464) Daniel W. E. Green