Central Bureau for Astronomical Telegrams
IAUC 3612: 1981f; AM Her; Sats OF SATURN
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Read IAUC 3613
Circular No. 3612
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
PERIODIC COMET GEHRELS 2 (1981f)
A. Cochran, McDonald Observatory, reports the probable recovery
of this comet as follows:
1981 UT R. A. (1950) Decl. m1
June 8.4391 0 33 34 + 8 21.1 18.5-19
9.4330 0 34 59 + 8 29.8
A TV-imaging system showed the comet to be essentially stellar in
appearance. The indicated correction to the prediction on MPC 5656
(elements on MPC 5640) is Delta-T = +0.15 day.
AM HERCULIS
J. Mattei, AAVSO, informs us that this object again seems to
be fading (cf. IAUC 349O). The following visual magnitude estimates
have been made by E. Mayer, Barberton, OH: May 2.25 UT, 13.2;
June 2.10, 13.3; 11.14, 14.4.
SATELLITES OF SATURN
C. Veillet, CERGA, reports that analysis of 49 positions of
1980 S 6 obtained with the Danish-ESO 1.5-m telescope on seven
nights during 1981 Apr. 6-14 gives for the true longitude U(t) =
228o.38 + n(t - t0) + 1o.314 sin n(t - t1); n is assumed to be the
mean daily motion of Saturn IV (Dione), t0 = 1981 Apr. 5.5 UT, t1 =
1981 Apr. 6.323 UT = the time of perisaturnium passage; the orbit,
with an eccentricity e = 0.015, satisfies the observed longitudes
within 0o.30 (s.d.) and gives for 1981 Apr. 1.25 UT a longitude
difference from Dione of +48o.4 (cf. the observation on IAUC 3593).
Observations of Saturn IX (Phoebe) obtained at the European
Southern Observatory under the direction of H. Debehogne:
1981 UT R. A. (1950) Decl.
Mar. 1.25213 12 31 38.57 - 0 35 33.7
1.25905 12 31 38.44 - 0 35 33.3
1.26598 12 31 38.35 - 0 35 32.4
5.31531 12 30 43.89 - 0 29 03.6
5.32224 12 30 43.79 - 0 29 03.5
5.32916 12 30 43.73 - 0 29 03.0
1981 June 12 (3612) Brian G. Marsden
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