Central Bureau for Astronomical Telegrams
IAUC 3442: 1979l
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Read IAUC 3443
Circular No. 3442
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
COMET BRADFIELD (1979l)
Further observations have been made at the Perth Observatory
by M. P. Candy and P. Jekabsons:
1980 UT R. A. (1950) Decl. m1
Jan. 5.81111 16 07 34.53 -41 36 42.4 4
5.81285 16 07 34.41 -41 36 48.2
7.83513 16 07 24.11 -43 13 33.2 6
9.79618 16 08 02.17 -45 05 55.9 6
10.79560 16 08 44.30 -46 12 24.7 6
Computations by D. W. E. Green and B. G. Marsden, Center for
Astrophysics, confirm the general correctness of the orbit calculated
by Pingre (1771, Mem. Acad. Paris, p. 427) for comet 1770 II,
in particular that Node = 111o (equinox 1950.0). Since perturbations
cause the nodes to advance in a retrograde orbit, identity of 1770
II with 1979l does not seem possible (cf. IAUC 3440). The following
general orbit solution by Marsden for 1979l satisfies the 14
Perth positions within 1".5; e has a formal mean error of +/- 0.0004.
T = 1979 Dec. 21.6097 ET Peri. = 257.5978
e = 0.988002 Node = 102.5071 1950.0
q = 0.545314 AU Incl. = 148.6044
1980 ET R. A. (1950) Decl. Delta r m1
Jan. 18.0 16 32.71 -60 08.7 0.366 0.816 4.4
18.5 16 37.62 -61 47.4
19.0 16 43.69 -63 34.6 0.334 0.832 4.3
19.5 16 51.36 -65 30.8
20.0 17 01.29 -67 36.6 0.303 0.847 4.2
20.5 17 14.54 -69 51.9
21.0 17 32.9 -72 15.6 0.275 0.863 4.1
21.5 17 59.5 -74 44.0
22.0 18 39.8 -77 08.5 0.249 0.879 3.9
22.5 19 42.4 -79 08.6
23.0 21 12.2 -80 05.4 0.227 0.895 3.8
23.5 22 51.5 -79 15.9
24.0 0 10.3 -76 38.6 0.211 0.911 3.7
24.5 1 02.5 -72 46.2
25.0 1 36.31 -68 07.9 0.201 0.927 3.7
25.5 1 59.05 -63 02.6
26.0 2 15.09 -57 43.2 0.198 0.943 3.7
1980 January 11 (3442) Brian G. Marsden
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