Circular No. 5380 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION Postal Address: Central Bureau for Astronomical Telegrams Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. Telephone 617-495-7244/7440/7444 (for emergency use only) TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505 MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN COMET SHOEMAKER-LEVY (1991a1) Orbital elements from MPC 19258: T = 1992 July 23.7558 ET Peri. = 145.4157 Node = 48.2948 1950.0 q = 0.829393 AU Incl. = 113.3739 1991 ET R.A. (1950) Decl. Delta r m1 Oct. 31 1 56.89 +38 26.1 2.976 3.898 15.8 Nov. 10 1 36.36 +37 58.9 20 1 16.13 +37 04.9 2.827 3.677 15.4 30 0 57.57 +35 50.3 Dec. 10 0 41.68 +34 24.4 2.821 3.452 15.1 20 0 28.99 +32 57.3 30 0 19.53 +31 37.7 2.907 3.221 14.9 COMET HELIN-LAWRENCE (1991l) Ephemeris from elements on MPC 18395: 1991 ET R.A. (1950) Decl. Delta r m1 Oct. 31 12 23.24 -31 28.6 2.654 1.880 10.4 Nov. 10 12 32.62 -36 41.7 20 12 43.18 -42 45.8 2.317 1.736 9.7 30 12 55.75 -49 51.6 Dec. 10 13 12.31 -58 09.1 1.993 1.621 9.1 20 13 38.78 -67 40.1 30 14 43.2 -77 56.2 1.769 1.546 8.6 V1251 CYGNI Further visual magnitude estimates: Oct. 12.84 UT, 13.5 (S. Korth, Dusseldorf, Germany); 26.39, 12.4 (M. Moriyama, Nagasaki, Japan; correction to the time 26.89 given on IAUC 5377); 26.83, 12.5 (P. Schmeer, Bischmisheim, Germany; revision to IAUC 5377); 31.98, 12.7 (Schmeer); Nov. 3.77, 13.2 (Schmeer); 4.80, 13.4 (Schmeer). 1991 November 6 (5380) Daniel W. E. Green
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