Circular No. 5412 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 ZANOTTA-BREWINGTON (1991g1) Mauro Zanotta and Howard Brewington have independently reported the discovery of a comet. The following observations are available: 1991 UT R.A. (2000) Decl. m1 Observer Dec. 23.76042 20 44.5 +19 10 9 Zanotta 23.78473 20 45.0 +19 05 " 24.07639 20 45 +19.5 Levy 24.12847 20 47 +18.5 10 Brewington 24.36146 20 46 44.04 +18 53 06.9 10 Kojima 24.36510 20 46 44.71 +18 52 58.7 " 24.37222 20 46 46.24 +18 52 55.6 " 24.37650 20 46 47.18 +18 52 42.2 " M. V. Zanotta (Milan, Italy). 0.15-m reflector. Comet diffuse with condensation. D. H. Levy (Tucson, AZ). 0.4-m reflector. Only a brief confirmation of the comet through a gap in the clouds. Position uncertain. H. J. Brewington (Cloudcroft, NM). 0.4-m reflector. Comet rather diffuse and no longer observable after moonrise. T. Kojima (YGCO Chiyoda Station). Communicated by S. Nakano. PERIODIC COMET SHOEMAKER-LEVY 7 (1991d1) Continuation to the ephemeris on IAUC 5397: 1991/92 R. A. (2000) Decl. Delta r Elong. Phase m1 Dec. 20 3 32.07 +38 28.7 0.801 1.713 147.1 18.2 17.0 30 3 39.12 +36 23.8 0.872 1.745 140.2 21.2 17.3 Jan. 9 3 49.32 +34 30.3 0.959 1.781 132.9 23.8 17.7 19 4 02.16 +32 52.5 1.062 1.822 125.8 26.0 18.0 29 4 17.00 +31 30.4 1.177 1.865 119.0 27.5 18.4 Feb. 8 4 33.37 +30 21.7 1.305 1.912 112.4 28.5 18.8 18 4 50.86 +29 23.3 1.442 1.961 106.1 29.0 19.2 28 5 09.10 +28 31.8 1.589 2.012 100.0 29.0 19.6 Mar. 9 5 27.85 +27 44.2 1.742 2.066 94.1 28.7 19.9 19 5 46.88 +26 57.9 1.901 2.120 88.3 28.0 20.3 1991 December 24 Brian G. Marsden