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IAUC 7075: C/1998 Y2

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                                                  Circular No. 7075
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET C/1998 Y2 (LI)
     Weidong Li, Department of Astronomy, University of California at
Berkeley, reports his discovery of a comet in the course of the
Lick Observatory Supernova Search (cf. IAUC 6627; with the participation
of M. Papenkova, E. Halderson, M. Modjaz, T. Shefler, J. Y. King,
R. R. Treffers and A. V. Filippenko).  The object was found automatically
by the Katzman Automatic Imaging Telescope in the field of NGC 1041, but
it was immediately recognized as a comet by Li, who then used the
equipment to make a deliberate confirmatory observation, as well as follow-up
observations on the following night.  Available CCD astrometry:

     1998 UT             R.A. (2000) Decl.        m1    Observer
     Dec. 26.23575    2 40 26.37   - 5 25 56.4   16.2   Li
          26.26623    2 40 26.47   - 5 25 27.3   16.1     "
          27.31124    2 40 32.08   - 5 08 39.7   15.3     "
          27.31584    2 40 32.12   - 5 08 34.1   15.3     "
          27.32030    2 40 32.08   - 5 08 29.5   15.5     "
          28.00613    2 40 37.04   - 4 57 25.8   15.0   Kowalski
          28.02951    2 40 37.28   - 4 57 02.8            "
          28.04815    2 40 37.20   - 4 56 43.1            "
          28.13387    2 40 37.85   - 4 55 23.0   15.5   Bell
          28.14006    2 40 37.87   - 4 55 17.3            "
          28.16014    2 40 37.99   - 4 54 57.8            "

W.-d. Li (Lick Observatory).  0.8-m KAIT.  Object diffuse.
R. Kowalski (Zephyrhills).  0.18-m reflector.  Coma perhaps 18" across.
G. Bell and G. Hug (Eksridge).  0.3-m Schmidt-Cassegrain.

     Parabolic orbital elements follow.  The comet is likely of short period.

     T = 1999 Feb.  1.854 TT          Peri. = 335.683
                                      Node  =  87.914   2000.0
     q = 2.67161 AU                   Incl. =  26.412

1998/99     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Dec. 28     2 40.61    - 4 57.5    2.091    2.698  118.1   18.7     14.9
Jan.  2     2 41.51    - 3 35.7    2.134    2.691  114.2   19.5     14.9
      7     2 42.98    - 2 12.5    2.180    2.685  110.4   20.1     15.0
     12     2 45.01    - 0 48.4    2.229    2.681  106.5   20.6     15.0
     17     2 47.60    + 0 36.1    2.281    2.677  102.8   21.0     15.1
     22     2 50.72    + 2 00.5    2.336    2.674   99.1   21.3     15.1

                      (C) Copyright 1998 CBAT
1998 December 28               (7075)              Brian G. Marsden

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