Central Bureau for Astronomical Telegrams
IAUC 3831: 1983f; Occn OF HYD -22 58794 BY NEPTUNE
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Read IAUC 3832
Circular No. 3831
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 IRAS (1983f)
Further precise positions have been reported as follows:
1983 UT R.A. (1950.0) Decl. m1 Observer
May 18.35660 9 15 51.56 -12 44 16.5 Russell
18.49944 9 15 50.56 -12 40 25.8 "
June 8.39123 9 19 01.56 - 6 03 24.1 Gilmore
10.34447 9 19 42.41 - 5 38 58.0 19.0 "
10.38978 9 19 43.44 - 5 38 26.4 "
12.39105 9 20 27.62 - 5 15 00.3 Russell
K. S. Russell (U.K. Schmidt Telescope Unit, Siding Spring).
A. C. Gilmore and P. M. Kilmartin (Mt. John Observatory).
Improved parabolic elements from observations May 18-June 12:
T = 1983 Jan. 19.030 ET Peri. = 227.069
Node = 118.925 1950.0
q = 1.41648 AU Incl. = 152.195
1983 ET R.A. (1950.0) Decl. p r m1
June 15 9 21.48 - 4 46.8 2.732 2.448 18.6
25 9 25.90 - 3 19.4
July 5 9 30.91 - 2 18.0 3.251 2.651 19.3
15 9 36.27 - 1 36.2
25 9 41.80 - 1 09.2 3.686 2.855 19.9
OCCULTATION OF HYD -22 58794 BY NEPTUNE
J. L. Elliot reports successful observations of this June 15
event (cf. IAUC 3818) by E. Dunham, D. Mink and himself from the
Kuiper Airborne Observatory flying northeast of Guam, by K. J.
Meech at the Infrared Telescope Facility on Mauna Kea, and by K.
Freeman, D. A. Allen and their colleagues at Siding Spring. A
preliminary analysis of the airborne data shows no evidence of
rings. W. B. Hubbard, University of Arizona, reports that his
observations also show no evidence of rings. Elliot (Department of
Earth and Planetary Sciences, Massachusetts Institute of Technology,
Cambridge, MA 02139, U.S.A.) would appreciate hearing from
successful observers interested in a collaborative analysis of the
event in order to determine the radius and oblateness of Neptune.
1983 June 24 (3831) Brian G. Marsden
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