Central Bureau for Astronomical Telegrams
IAUC 3608: 1981 N 1; Sats OF SATURN; 1980l
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Circular No. 3608
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
1981 N 1
H. J. Reitsema, Lunar and Planetary Laboratory, reports that
observations of the May 24 Neptune appulse (Mink et al. 1981, A.J.
86, 135) suggest that Neptune may possess a previously unsuspected
satellite at least 180 km in diameter and situated some 3 Neptune
radii from the center of mass of the system (if the object is in
Neptune's equatorial plane). Observations with two University of
Arizona telescopes, situated ~ 5 km apart, each showed an abrupt
occultation event, ~ 8 seconds in duration and corresponding to
full stellar intensity, beginning at 8h36m40s UT. The observations
were made by Reitsema and W. B. Hubbard with the 1.5-m reflector at
the Catalina station and by L. A. Lebofsky and D. Tholen with the
1.0-m reflector on Mt. Lemmon.
SATELLITES OF SATURN
C. Veillet, CERGA, observing with the 1.5-m Danish telescope
at the European Southern Observatory, has refined the longitude difference
of 1981 S 2 from Saturn III (from 29 observations during
Apr. 10-14) to 55o.1 +/- 0o.6 (p.e.). Another satellite, presumably
1981 S 1, of comparable brightness, was noted (from 12 observations
on Apr. 12 and 14) at a longitude difference of +58o.79 +/- 0o.24 (p.e.).
COMET RUSSELL (1980l)
The following ephemeris continuation, from the elements on MPC
5837, replaces that given on MPC 5652:
1981 ET R. A. (1950) Decl. Delta r m1
May 26 16 33.48 -59 06.5
June 5 15 27.11 -51 54.6 1.449 2.363 15.0
15 14 45.81 -43 21.5
25 14 21.97 -35 25.0 1.705 2.474 15.6
July 5 14 08.82 -28 53.3
15 14 02.28 -23 49.4 2.152 2.599 16.3
25 13 59.94 -19 58.8
Aug. 4 14 00.41 -17 04.7 2.669 2.735 17.0
14 14 02.84 -14 52.8
24 14 06.65 -13 12.1 3.181 2.880 17.6
Sept. 3 14 11.47 -11 54.0
13 14 17.03 -10 52.3 3.642 3.031 18.1
1981 May 29 (3608) Brian G. Marsden
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