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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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