Central Bureau for Astronomical Telegrams
IAUC 3960: 1984i
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Read IAUC 3961
Circular No. 3960
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 617-495-7244/7440/7444
COMET AUSTIN (1984i)
The following precise positions have been measured by P. M.
Kilmartin from exposures by A. C. Gilmore with the 0.6-m reflector
at the Mount John University Observatory. The first and third
July 17 images were trailed. Estimates by Gilmore with the 7 x 50
finder on July 18.3 UT gave m1 = 6.4, coma diameter ~ 10'.
1984 UT R.A. (1950.0) Decl. m1
July 12.75938 7 25 23.51 -29 32 02.8 8
12.80139 7 26 39.06 -29 23 38.7
17.28299 8 57 50.10 -15 56 08.8 8
17.28785 8 57 53.89 -15 55 25.8
17.29861 8 58 02.13 -15 53 53.4
The following improved parabolic orbital elements have been
derived by the undersigned from 11 observations July 8-17. The
comet will be within 20 deg of the sun during Aug. 5-27.
T = 1984 Aug. 12.1345 ET Peri. = 353.0965
Node = 170.8645 1950.0
q = 0.291369 AU Incl. = 164.1563
1984 ET R.A. (1950.0) Decl. p r m1
July 25 9 54.92 - 3 21.4 0.626 0.603 6.8
26 9 58.43 - 2 18.1
27 10 01.42 - 1 18.9 0.698 0.558 6.7
28 10 03.94 - 0 23.2
29 10 06.03 + 0 29.7 0.770 0.513 6.5
30 10 07.72 + 1 20.5
31 10 09.04 + 2 09.5 0.844 0.469 6.3
Aug. 1 10 10.00 + 2 57.3
2 10 10.62 + 3 44.3 0.918 0.426 6.1
3 10 10.89 + 4 30.9
8 10 07.15 + 8 28.2 1.133 0.319 5.3
13 9 55.34 +12 41.5
18 9 39.74 +16 40.3 1.347 0.345 6.0
23 9 25.15 +19 58.9
28 9 12.40 +22 46.3 1.346 0.552 8.1
Sept. 2 9 00.80 +25 17.2
7 8 49.50 +27 42.1 1.261 0.775 9.4
1984 July 20 (3960) Brian G. Marsden
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