Electronic Telegram No. 5270 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 L1 = P/2008 L2 (HILL) R. Kresken, F. Ocana, M. Micheli, and L. Conversi report the recovery of comet P/2008 L2 (cf. IAUCs 8953, 8960) as a stellar object on CCD images obtained with a 0.56-m f/2.52 astrograph at La Silla, Chile (astrometry tabulated below). 2023 UT R.A. (2000) Decl. Mag. Observer June 1.39417 1 26 12.20 +20 01 01.2 Kresken 1.40409 1 26 13.42 +20 01 05.4 18.8 " 1.41373 1 26 14.60 +20 01 08.6 18.4 " 1.42369 1 26 15.80 +20 01 12.4 19.0 " 2.42665 1 28 15.75 +20 07 26.3 18.5 " 8.38774 1 40 04.29 +20 42 20.2 18.1 " 8.42302 1 40 08.45 +20 42 31.4 18.6 " The residuals of the recovery observations were +0.28 deg in R.A. and -0.03 deg in Decl. from the prediction in NK 1840 and in the HICQ's 2021 Comet Handbook, with a corresponding correction of Delta(T) = -1.09 days. The following linked orbital elements by S. Nakano (Central Bureau) are from 659 observations spanning 2008-2023 (mean residual 0".6). The comet passed 0.73 AU from Jupiter on 2006 Aug. 18 UT. Epoch = 1993 Aug. 1.0 TT T = 1993 Aug. 18.18075 TT Peri. = 138.90085 e = 0.6064615 Node = 218.81506 2000.0 q = 2.3925736 AU Incl. = 26.52815 a = 6.0796424 AU n = 0.06574868 P = 14.99 years Epoch = 2008 Aug. 2.0 TT T = 2008 Aug. 18.59446 TT Peri. = 141.31392 e = 0.6137675 Node = 217.98436 2000.0 q = 2.3173377 AU Incl. = 25.86017 a = 5.9998511 AU n = 0.06706460 P = 14.70 years Epoch = 2023 May 16.0 TT T = 2023 May 9.94061 TT Peri. = 141.25708 e = 0.6138406 Node = 218.01296 2000.0 q = 2.3299362 AU Incl. = 25.86879 a = 6.0336131 AU n = 0.06650249 P = 14.82 years Epoch = 2037 Dec. 8.0 TT T = 2037 Dec. 19.54885 TT Peri. = 141.01382 e = 0.6130145 Node = 217.71036 2000.0 q = 2.3073139 AU Incl. = 25.94928 a = 5.9622748 AU n = 0.06769960 P = 14.56 years The following ephemeris by the undersigned from the above orbital elements uses photometric power-law parameters H = 12.0 and 2.5n = 10 for the magnitudes. Date TT R. A. (2000) Decl. Delta r Elong. Phase Mag. 2023 05 16 00 53.08 +18 06.0 3.059 2.331 36.9 15.1 18.1 2023 05 26 01 13.37 +19 19.0 3.001 2.334 41.1 16.6 18.1 2023 06 05 01 33.37 +20 22.9 2.937 2.341 45.5 18.0 18.0 2023 06 15 01 52.99 +21 16.6 2.869 2.352 50.2 19.4 18.0 2023 06 25 02 12.08 +21 58.9 2.795 2.365 55.1 20.6 18.0 2023 07 05 02 30.49 +22 28.7 2.717 2.382 60.2 21.8 17.9 2023 07 15 02 48.05 +22 45.2 2.634 2.401 65.7 22.7 17.9 2023 07 25 03 04.54 +22 47.7 2.546 2.424 71.5 23.4 17.9 2023 08 04 03 19.74 +22 35.6 2.456 2.449 77.7 23.9 17.8 2023 08 14 03 33.40 +22 08.3 2.364 2.477 84.3 24.0 17.8 2023 08 24 03 45.23 +21 25.5 2.270 2.508 91.4 23.8 17.8 2023 09 03 03 54.96 +20 26.9 2.179 2.540 99.0 23.1 17.7 2023 09 13 04 02.34 +19 12.5 2.090 2.575 107.3 21.9 17.7 2023 09 23 04 07.12 +17 42.6 2.010 2.612 116.2 20.2 17.7 2023 10 03 04 09.17 +15 58.3 1.940 2.651 125.7 17.8 17.7 2023 10 13 04 08.51 +14 01.9 1.885 2.692 135.8 15.0 17.7 2023 10 23 04 05.35 +11 57.4 1.850 2.735 146.3 11.6 17.7 2023 11 02 04 00.18 +09 50.7 1.839 2.778 156.6 8.2 17.8 2023 11 12 03 53.71 +07 49.1 1.856 2.824 164.9 5.2 17.9 2023 11 22 03 46.82 +05 59.9 1.902 2.870 166.0 4.8 18.0 2023 12 02 03 40.41 +04 29.2 1.976 2.918 158.9 7.0 18.1 2023 12 12 03 35.20 +03 20.6 2.078 2.966 149.1 9.8 18.3 2023 12 22 03 31.71 +02 34.6 2.204 3.016 139.0 12.4 18.5 2024 01 01 03 30.20 +02 09.6 2.350 3.066 129.0 14.4 18.7 2024 01 11 03 30.71 +02 02.5 2.513 3.117 119.5 15.9 18.9 2024 01 21 03 33.17 +02 09.8 2.688 3.169 110.5 16.9 19.2 2024 01 31 03 37.39 +02 27.9 2.871 3.221 101.8 17.4 19.4 2024 02 10 03 43.16 +02 53.5 3.060 3.274 93.6 17.5 19.6 2024 02 20 03 50.28 +03 23.8 3.250 3.327 85.8 17.2 19.8 2024 03 01 03 58.54 +03 56.5 3.440 3.380 78.3 16.7 20.0 2024 03 11 04 07.75 +04 29.5 3.626 3.434 71.0 15.9 20.2 2024 03 21 04 17.74 +05 01.3 3.807 3.488 64.0 14.9 20.3 2024 03 31 04 28.37 +05 30.5 3.980 3.542 57.3 13.7 20.5 NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2023 CBAT 2023 June 13 (CBET 5270) Daniel W. E. Green