Central Bureau for Astronomical Telegrams
IAUC 2763: 1975d
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Read IAUC 2764
Circular No. 2763
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS
COMET BRADFIELD (1975d)
The following positions have been reported:
1975 UT R. A. (1950) Decl. m1 Observer
Mar. 13.02 1 08.1 -22 03 9 Dossin
13.40608 1 09 31.74 -22 00 16.9 9 Herald
14.015 1 12.2 -21 56 Dossin
15.406 1 17.8 -21 50 9 Stephenson
16.023 1 19.7 -21 42 Dossin
16.403 1 21.8 -21 45 9 Stephenson
17.02 1 23.6 -21 35 Dossin
19.39757 1 33 08.21 -21 15 14.0 9 Herald
19.41215 1 33 12.72 -21 14 59.5 "
21.40000 1 41 16.44 -20 57 21.1 9 "
F. Dossin (European Southern Observatory). Central condensation of
magnitude 12.5 and fanshaped coma extending 15" north and east.
D. Herald (Woden, near Canberra). 31-cm reflector. The comet is
small (2' to 3' diameter) with neither condensation nor tail.
S. Stephenson (Glenroy, near Melbourne). Comet diffuse without
condensation. Communicated by J. B. Trainor.
The following parabolic elements, by the undersigned, satisfy
four of the six available accurate positions within 4":
T = 1975 Apr. 4.71 ET Peri. = 264.27
Node = 157.29 1950.0
q = 1.2152 AU Incl. = 55.29
1975 ET R. A. (1950) Decl. Delta r m1
Mar. 14 1 11.85 -21 56.5
19 1 31.57 -21 18.7 1.971 1.243 8.9
24 1 52.04 -20 32.3
29 2 13.19 -19 37.0 1.904 1.220 8.8
Apr. 3 2 34.92 -18 32.3
8 2 57.11 -17 18.6 1.856 1.216 8.7
13 3 19.62 -15 56.3
18 3 42.25 -14 26.6 1.836 1.233 8.7
m1 = 6.5 + 5 log Delta + 10 log r
1975 March 25 (2763) Brian G. Marsden
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