Circular No. 5295 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 HELIN-ALU (1991r) E. Helin reports the following additional positions (cf. IAUC 5292) from 0.46-m Schmidt films obtained at Palomar: 1991 UT R.A. (1950) Decl. m1 June 13.34722 16 35 53.76 -22 25 43.3 14.35590 16 35 22.51 -22 18 14.9 16.24878 16 34 24.54 -22 04 07.3 16 16.31753 16 34 22.38 -22 03 38.4 16.34583 16 34 21.44 -22 03 23.8 16.36701 16 34 20.73 -22 03 12.5 18.26736 16 33 23.65 -21 49 08.4 18.29896 16 33 22.63 -21 48 55.3 The very preliminary parabolic orbital elements below are from the available observations. T and q are particularly uncertain, but the ephemeris should be useful. T = 1991 Mar. 2.118 ET Peri. = 348.796 Node = 252.742 1950.0 q = 5.58729 AU Incl. = 57.060 1991 ET R.A. (1950) Decl. Delta r m1 June 13 16 36.08 -22 28.3 4.635 5.637 15.8 18 16 33.53 -21 51.1 23 16 31.13 -21 14.4 4.687 5.647 15.9 28 16 28.91 -20 38.4 July 3 16 26.91 -20 03.4 4.769 5.658 15.9 8 16 25.14 -19 29.6 13 16 23.64 -18 57.0 4.877 5.670 16.0 18 16 22.41 -18 26.0 23 16 21.47 -17 56.5 5.008 5.683 16.0 COMET HELIN-LAWRENCE (1991l) Total visual magnitude estimates (cf. IAUC 5247): May 11.29 UT, 13.5 (A. Hale, Las Cruces, NM, 0.41-m reflector); 19.34, 13.6 (Hale); June 2.23, 13.7 (C. S. Morris, Lockwood Valley, CA, 0.51-m reflector); 4.24, 13.0 (Hale); 8.26, 13.8 (Morris). 1991 June 19 (5295) Daniel W. E. Green
Our Web policy. Index to the CBAT/MPC/ICQ pages.