Circular No. 3901 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION Postal Address: Central Bureau for Astronomical Telegrams Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. TWX 710-320-6842 ASTROGRAM CAM Telephone 617-864-5758 1983 TB The following orbital elements correspond to those on MPC 8394 but are for a different epoch: T = 1983 Aug. 31.6791 ET Epoch 1983 Sept. 23.0 ET Peri. = 321.6818 e = 0.890335 Node = 265.0324 1950.0 a = 1.271502 AU Incl. = 22.0353 n = 0.6874303 q = 0.139440 AU P = 1.434 years 1983/84 ET R.A. (1950.0) Decl. p r Mag. Dec. 12 23 07.06 +20 10.1 1.361 1.770 18.7 22 23 23.21 +18 59.7 Jan. 1 23 38.69 +18 22.2 1.771 1.930 19.4 11 23 53.80 +18 09.2 21 0 08.67 +18 14.5 2.169 2.062 19.9 31 0 23.42 +18 33.7 Feb. 10 0 38.11 +19 03.7 2.535 2.171 20.2 20 0 52.78 +19 41.7 Mar. 1 1 07.45 +20 25.8 2.851 2.256 20.5 COMET IRAS (1983o) Ephemeris continuation from MPC 8292: 1983/84 ET R.A. (1950.0) Decl. p r m2 Dec. 12 14 35.91 -28 57.0 2.990 2.260 15.9 22 14 42.42 -27 12.0 Jan. 1 14 47.52 -25 14.2 2.745 2.288 15.8 11 14 50.87 -22 57.2 21 14 52.08 -20 13.4 2.425 2.337 15.6 31 14 50.67 -16 53.5 Feb. 10 14 46.04 -12 46.5 2.079 2.407 15.4 20 14 37.58 - 7 41.6 Mar. 1 14 24.75 - 1 33.2 1.792 2.494 15.2 11 14 07.28 + 5 30.7 21 13 45.61 +12 59.9 1.681 2.597 15.3 31 13 21.04 +20 06.4 Apr. 10 12 55.71 +26 05.4 1.824 2.713 15.6 20 12 32.00 +30 35.6 30 12 11.70 +33 41.3 2.176 2.839 16.2 1983 December 21 (3901) Brian G. Marsden
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