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IAUC 3121: 1977o; 1977m; 1977j; TIME ADJUSTMENT ON 1977 Dec. 31

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IAUC number 

                                                  Circular No. 3121
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK     Telex: 921428
Telephone: (617) 864-5758


COMET SCHUSTER (1977o)
     H.-E. Schuster and R. M. West, European Southern Observatory,
telex that this object (cf. IAUC 3120) is definitely a comet, a 40-min
exposure with the 100-cm Schmidt telescope showing a tail some
20" long to the north-northeast.  The head is diffuse, a few seconds
of arc across, with no apparent central condensation.  The
following positions are semiaccurate.  The Oct. 13 position (IAUC
3120) should be rejected.

     1977 UT             R. A. (1950) Decl.        m1
     Oct. 14.03893    23 29 31.5    -35 49 41    16-17
          15.03967    23 28 48.2    -35 33 44
          15.26059    23 28 37.6    -35 30 03


COMET KOHLER (1977m)
     D. Wallentine, Albuquerque, New Mexico, points out that the
coma of this comet will occult the star 70 Oph (V = 4.0, spectrum
K0) on Oct. 27.71 UT, the event being generally observable from
Europe and Asia.  Computations by the undersigned indicate that the
nucleus will pass 90" (geocentric) from the star (and in p.a. 36o)
on Oct. 27d17h04m UT.


PERIODIC COMET WOLF-HARRINGTON (1977j)
     The following precise positions have been measured by J. H.
Bulger from exposures by G. Schwartz, C.-Y. Shao and R. E. McCrosky
with the Harvard College Observatory's 155-cm reflector:

     1977 UT             R. A. (1950) Decl.
     July 11.28885    23 40 21.86   +21 51 54.9
          14.27711    23 41 43.27   +22 25 55.1
     Aug. 16.24871    23 44 46.86   +27 51 50.8
          21.19727    23 43 02.75   +28 26 48.3


TIME ADJUSTMENT ON 1977 DECEMBER 31
     The Bureau International de l'Heure informs us that a positive
leap second will occur such that the sequence of UTC second markers
will be: 1977 Dec. 31d23h59m59s, 31d23h59m60s, 1978 Jan. 1d00h00m00s.


1977 October 17                (3121)              Brian G. Marsden

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