Central Bureau for Astronomical Telegrams
IAUC 3619: 1981g; RECOVERIES OF PERIODIC COMETS; Sats OF SATURN
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Read IAUC 3620
Circular No. 3619
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 GONZALEZ (1981g)
Further precise positions have been reported as follows:
1981 UT R. A. (1950) Decl. m1 Observer
July 24.37194 0 17 16.07 -70 26 04.3 16 Gilmore
24.39442 0 17 15.64 -70 27 01.2 "
24.89861 0 17 03.52 -70 48 36.0 15 Johnston
A. C. Gilmore and P. M. Kilmartin (Mt. John University Observatory).
Object diffuse with condensation, no tail.
J. Johnston (Perth Observatory, Bickley). Diffuse with nucleus.
These observations confirm that the object is identical with
that observed on June 29 (IAUC 3617), but the June 29, July 22 and
24 positions are not completely compatible with a parabolic orbit.
The following predicted positions should be more reliable than the
ones on IAUC 3618: 1981 July 25.0, R. A. = 0h17m.0, Decl. = -70o52'.9
(equinox 1950.0); Aug. 4.0, 0h05m.9, -77o31'.1; 14.0, 23h22m.9, -82o59'.1.
RECOVERIES OF PERIODIC COMETS
The attention of contributors is drawn to the fact that the
present situation regarding comet recoveries is unsatisfactory. Observers
are advised that two or more observations should be reported
to an accuracy sufficient to show consistency with the comet's expected
motion and line of variation; care should be taken to ensure
that the observations do not refer to a faint minor planet.
SATELLITES OF SATURN
D. Pascu and P. K. Seidelmann, U.S. Naval Observatory, report
the following observations of 1980 S 13 made with the Space Telescope
Wide-Field Planetary Camera Instrument Definition Team Ground-Based
Charge-Coupled-Device Camera on the 1.5-m astrometric reflector
in Flagstaff: 1981 May 3.27337 UT, dR. A. = +44".0, dDecl. = +4".1
(with respect to the center of Saturn); 4.16409, -44".7, +1".3; 7.13867,
+36".2, +1".9; 7.15169, +34".6, +1".9. Unidentified satellites were
also recorded as follows: 1981 S 3, R ~ 15, May 3.25301, -34".9,
-5".4; 3.25978, -34".3, -5".3; 3.26573, -34".5, -5".2; 3.27132, -33".8,
-5".4; 3.27337, -35".2, -5".1; 1981 S 4, fainter than 1980 S 13, May
4.16409, -41".2, +1".0; 1981 S 5, R ~ 14, May 8.14381, +37".9, -0".9;
8.15823, +36".9, -1".1.
1981 July 28 (3619) Brian G. Marsden
Read IAUC 3620
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