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IAUC 7550: C/2000 Y2

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                                                  Circular No. 7550
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)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET C/2000 Y2
     Additional CCD astrometry (cf. IAUC 7549):

     2000 UT             R.A. (2000) Decl.        m1    Observer
     Dec. 28.61241    9 24 20.45   + 0 40 33.1          Kojima
          28.63634    9 24 20.64   + 0 40 29.9            "
          28.64643    9 24 20.74   + 0 40 28.7   18.1     "
          28.77153    9 24 21.76   + 0 40 14.6          Kadota
          28.77578    9 24 21.86   + 0 40 11.9            "
          28.77925    9 24 21.72   + 0 40 11.1   17.8     "
          28.78692    9 24 22.11   + 0 40 11.8            "
          28.97118    9 24 23.91   + 0 39 47.3   17.1   Ticha
          28.97353    9 24 23.96   + 0 39 45.9            "
          28.97674    9 24 24.01   + 0 39 45.9            "
          29.09772    9 24 25.05   + 0 39 30.5          Kusnirak
          29.16905    9 24 25.62   + 0 39 22.2            "
          29.59097    9 24 29.82   + 0 38 32.7          Kojima
          29.59674    9 24 29.90   + 0 38 31.6            "
          29.61140    9 24 30.02   + 0 38 28.3   18.0     "
          29.62580    9 24 30.12   + 0 38 27.8            "

T. Kojima (Chiyoda).  0.25-m f/6.0 reflector.  On Dec. 28, comet
  small with strong condensation and apparent extension toward the
  west.
K. Kadota (Ageo).  0.18-m f/5.5 reflector.  Communicated by S. Nakano.
J. Ticha, M. Tichy, and M. Kocer (Klet).  0.57-m f/5.2 reflector.
P. Kusnirak (Ondrejov).  0.65-m f/3.6 reflector.

     Preliminary parabolic orbital elements:

     T = 2001 Jan. 24.003 TT          Peri. = 307.213
                                      Node  = 188.572   2000.0
     q = 2.82988 AU                   Incl. =  11.625

2000/01     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Dec. 22     9 22.81   + 0 58.4   2.154   2.850  126.4   16.1   17.2
     27     9 24.04   + 0 44.3   2.102   2.844  130.9   15.2   17.2
Jan.  1     9 24.80   + 0 34.3   2.054   2.840  135.4   14.1   17.1
      6     9 25.11   + 0 28.6   2.011   2.836  140.1   12.9   17.0
     11     9 24.99   + 0 27.5   1.972   2.833  144.8   11.5   17.0

                      (C) Copyright 2000 CBAT
2000 December 29               (7550)            Daniel W. E. Green

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