Circular No. 5363 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) Carolyn S. Shoemaker, Eugene M. Shoemaker, and David H. Levy report their discovery of another comet. The following positions are available: 1991 UT R.A. (1950) Decl. m1 Observer Oct. 6.50243 2 40 01.38 +37 43 08.2 16.5 Shoemaker 7.45833 2 38 38.97 +37 47 07.3 " 8.32690 2 37 22.62 +37 50 39.7 " 9.12961 2 36 10.89 +37 53 47.2 McCrosky 9.14110 2 36 09.83 +37 53 49.9 " 10.06256 2 34 45.84 +37 57 17.5 " E. M. Shoemaker, C. S. Shoemaker, and D. H. Levy (Palomar). 0.46-m Schmidt films. Scanned by C. S. Shoemaker; measured by K. A. Lawler. On Oct. 8, the comet appeared strongly condensed with a coma and a short tail in p.a. 200 deg. R. E. McCrosky and C.-Y. Shao (Oak Ridge). 1.55-m reflector + CCD. Oct. 10 observation made through clouds. Preliminary parabolic orbital elements from the above observa- tions: T = 1992 July 29.619 ET Peri. = 143.888 Node = 48.569 1950.0 q = 0.88387 AU Incl. = 113.914 1991 ET R.A. (1950) Decl. Delta r m1 Oct. 1 2 47.37 +37 17.5 3.511 4.251 16.5 6 2 40.74 +37 41.0 11 2 33.31 +38 00.7 3.311 4.145 16.3 16 2 25.14 +38 15.8 21 2 16.30 +38 25.7 3.142 4.039 16.0 26 2 06.87 +38 29.4 31 1 57.00 +38 26.6 3.010 3.931 15.8 Nov. 5 1 46.84 +38 16.8 10 1 36.57 +38 00.1 2.917 3.823 15.6 15 1 26.39 +37 36.6 20 1 16.46 +37 07.1 2.863 3.713 15.5 1991 October 10 Daniel W. E. Green