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IAUC 3141: Occn OF SAO 85009 BY (2); P/GUNN; 1977o

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                                                  Circular No. 3141
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


OCCULTATION OF SAO 85009 BY (2) PALLAS ON 1978 MAY 29
     L. H. Wasserman and O. G. Franz, Lowell Observatory, report
that the AGK3 position of this star (AGK3 +25 1763) is in error by
+1" in Decl. whereas the SAO position is correct.  Measurement of two
exposures by H. L. Giclas with the 33-cm photographic telescope on
Aug. 5 yields the position of the star as R.A. = 17h17m37s.58, Decl. =
+25o28'54".5 (equinox 1950.0) with respect to 58 reference stars in
the AGK3; end figures from a similar reduction using the SAO Catalogue
are 37s.57, 54".4, and the standard deviation is +/- 0s.01, +/- 0".1.
The central line for the occultation will thus be considerably
north of that predicted by G. E. Taylor in Handb. Br. Astron. Assoc.
for 1978; it should now pass near Portland, Maine; Ottawa, Ontario;
through Lake Superior and along the U.S.-Canadian border to the
Pacific Ocean.  Further uncertainties possibly remaining in the
star position and in the Pallas ephemeris could shift the track by
several hundred km, which is comparable to the track's width.


PERIODIC COMET GUNN
     The following precise positions have been reported:

     1977 UT             R. A. (1950) Decl.        Observer
     Aug. 21.33377     2 31 25.94   + 5 57 58.0    Schwartz
     Sept.11.35796     2 29 25.94   + 5 29 17.1    Shao
     Oct. 18.73646     2 08 57.27   + 3 49 38.5    Jekabsons

G. Schwartz and C.-Y. Shao (Harvard College Observatory, Agassiz
   Station).  155-cm reflector.  Measurer: J. H. Bulger.
P. Jekabsons (Perth Observatory, Bickley).  33-cm astrograph.


PERIODIC COMET SCHUSTER (1977o)
     R. M. West, European Southern Observatory, provides the following
precise positions, measured from exposures by H.-E. Schuster
with the 100-cm Schmidt telescope at La Silla:

     1977 UT             R. A. (1950) Decl.
     Nov.  4.11248    23 22 48.46   -28 39 59.2
           8.09325    23 23 36.97   -27 01 14.6
          10.02962    23 24 14.50   -26 11 48.3


1977 November 21               (3141)              Brian G. Marsden

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