Electronic Telegram No. 5074 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/2005 T2 = P/2012 V5 = P/2020 OV_62 (CHRISTENSEN) [Editor's note: this text replaces that on CBET 5073 (orbital elements).] An apparently asteroidal object discovered with the 1.5-m reflector in the course of the Mt. Lemmon Survey on 2020 July 31 (discovery observations tabulated below), and assigned the minor-planet designation 2020 OV_62 by the Minor Planet Center last year (cf. MPS 1306968), was suggested by A. Odasso (Milan, Italy; as posted on the "Minor Planet Mailing List" forum) as being possibly identical with comet P/2005 T2 (cf. IAUC 8614) -- a suggestion confirmed by S. Deen (Simi Valley, CA, USA) when he was able to find additional observations in publicly available images obtained with the Pan-STARRS1 1.8-m Ritchey-Chretien reflector at Haleakala in 2012, with the 3.6-m Canada-France-Hawaii Telescope at Mauna Kea in 2013 as part of a program by J.-C. Cuillandre observing the Taurus Molecular Cloud Complex, and with the 4-m Blanco telescope at Cerro Tololo as part of the "DECam Local Volume Exploration Survey" in 2019 (Deen's astrometry also tabulated below). 2012 UT R.A. (2000) Decl. Mag. Aug. 3.35680 19 02 00.45 -14 04 51.4 20.5 8.34915 19 00 06.39 -13 56 43.4 21.8 8.35943 19 00 06.16 -13 56 42.4 8.37033 19 00 05.94 -13 56 41.7 20.7 8.38047 19 00 05.71 -13 56 40.6 2013 UT R.A. (2000) Decl. Mag. Oct. 4.56396 4 34 26.46 +26 21 57.7 23.4 4.56648 4 34 26.44 +26 21 57.7 4.56773 4 34 26.44 +26 21 57.7 4.56900 4 34 26.44 +26 21 57.6 23.3 2019 UT R.A. (2000) Decl. Mag. June 7.14674 14 44 24.25 -21 13 44.8 22.6 23.10796 14 38 24.10 -19 55 21.9 22.1 2020 UT R.A. (2000) Decl. Mag. July 31.41991 1 06 23.23 +18 12 57.1 22.5 31.42509 1 06 23.36 +18 12 59.8 20.7 31.43026 1 06 23.59 +18 13 01.3 21.5 31.43546 1 06 23.73 +18 13 03.5 20.9 Deen notes that there is no clear sign of a tail or any coma in any of the 2012, 2013, and 2019 images that he found, though there appears to be a consistent slight elongation (not more than 0".25) in the east-west direction in the 2013 and 2019 images. Additional observations appear on MPEC 2021-W47 (including eight Pan-STARRS1 observations at mag 21.4-21.8 from 2012 Nov. 5 that were found in the MPC's "isolated tracklet file"). S. Nakano (CBAT) writes that the residuals for the 2012 Aug. 3 observation is +1.03 deg in R.A. and +0.27 deg in Decl. from the prediction in the ICQ's 2011 and 2019 Comet Handbooks (and NK 1398 and 3440), with a corresponding correction to the time of perihelion of Delta(T) = -1.89 days; the residuals for the 2020 July 31 observations are +1.02 deg in R.A. and +0.29 deg in Decl. from the same prediction, with an indicated correction of Delta(T) = -3.29 days. The following linked orbital elements by Nakano are from 129 observations spanning 2005-2020 (mean residual 0".5). The comet passed 2.69 AU from Jupiter on 2019 Sept. 10 and will pass 0.41 AU from Jupiter on 2037 Nov. 12 UT. The comet appears to have undergone an outburst in brightness at its 2005 apparition; its brightness at the two subsequent apparitions have followed fairly closely the power-law formula Mag. = 16.5 + 5 log Delta + 7 log r, and these parameters suggest a peak brightness near mag 20 during 2027 June-August. Epoch = 1997 Nov. 8.0 TT T = 1997 Oct. 20.94803 TT Peri. = 58.43049 e = 0.4207995 Node = 260.75701 2000.0 q = 2.2201333 AU Incl. = 8.33297 a = 3.8330996 AU n = 0.13133453 P = 7.50 years Epoch = 2005 Apr. 20.0 TT T = 2005 Apr. 11.35661 TT Peri. = 58.37421 e = 0.4216303 Node = 260.62685 2000.0 q = 2.2113761 AU Incl. = 8.33731 a = 3.8234650 AU n = 0.13183126 P = 7.48 years Epoch = 2012 Sept.30.0 TT T = 2012 Oct. 5.48154 TT Peri. = 58.69305 e = 0.4215529 Node = 260.45761 2000.0 q = 2.2096381 AU Incl. = 8.33672 a = 3.8199485 AU n = 0.13201334 P = 7.47 years Epoch = 2020 Apr. 21.0 TT T = 2020 Apr. 5.28206 TT Peri. = 58.85143 e = 0.4161782 Node = 260.15574 2000.0 q = 2.2453221 AU Incl. = 8.29143 a = 3.8459031 AU n = 0.13067923 P = 7.54 years Epoch = 2027 Nov. 11.0 TT T = 2027 Oct. 24.80983 TT Peri. = 58.87862 e = 0.4144047 Node = 260.11099 2000.0 q = 2.2585533 AU Incl. = 8.27914 a = 3.8568499 AU n = 0.13012327 P = 7.57 years Epoch = 2035 June 2.0 TT T = 2035 May 18.64105 TT Peri. = 58.99766 e = 0.4160464 Node = 260.05156 2000.0 q = 2.2458014 AU Incl. = 8.28877 a = 3.8458559 AU n = 0.13068164 P = 7.54 years NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2021 CBAT 2021 November 27 (CBET 5074) Daniel W. E. Green