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IAUC 6563: C/1997 D1

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                                                  Circular No. 6563
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/cfa/ps/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET C/1997 D1 (MUELLER)
     The following precise CCD positions have been reported:

     1997 UT             R.A. (2000) Decl.        m1    Observer
     Feb. 20.22830   12 41 21.59   +47 24 13.3          Rogers
          20.26997   12 41 14.82   +47 25 09.4   15.8     "
          20.51736   12 40 35.44   +47 30 30.6   14.6   Sugie
          20.52847   12 40 33.62   +47 30 44.9            "
          20.55087   12 40 30.01   +47 31 14.5   15.1   Nakamura
          20.55920   12 40 28.69   +47 31 25.1            "
          20.69031   12 40 07.62   +47 34 14.5   14.6   Zhou
          20.70486   12 40 05.25   +47 34 33.5            "

J. Rogers (Camarillo).  0.25-m Schmidt-Cassegrain.
A. Sugie (Dynic).  0.60-m f/5.0 reflector.  Communicated by S. Nakano.
A. Nakamura (Kuma Kogen).  0.60-m reflector.  Communicated by Nakano.
X. Zhou, X. Y. Li, J. Zhu, R. H. Liu and Y. K. Kim (Xinglong).
   0.60-m Schmidt.  Measurer J. Zhu.

     Parabolic orbital elements from 10 observations Feb. 17-20 (mean of
Feb. 17 trail ends on IAUC 6562, beginning of Feb. 19 trail):

     T = 1997 Oct.  9.527 TT          Peri. = 179.982
                                      Node  = 277.822   2000.0
     q = 2.37528 AU                   Incl. = 142.148

1997 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Feb. 11    13 02.48    +43 58.7    2.816    3.506  127.5   12.9     15.2
     16    12 51.84    +45 51.0    2.746    3.469  130.4   12.5     15.1
     21    12 39.29    +47 40.9    2.686    3.432  132.5   12.3     15.0
     26    12 24.74    +49 24.7    2.637    3.396  133.5   12.2     14.9
Mar.  3    12 08.22    +50 58.4    2.601    3.360  133.4   12.4     14.8
      8    11 49.87    +52 18.1    2.576    3.324  132.1   12.8     14.8
     13    11 30.08    +53 20.2    2.564    3.289  129.6   13.5     14.7
     18    11 09.38    +54 02.1    2.564    3.253  126.3   14.3     14.7
     23    10 48.45    +54 22.8    2.575    3.219  122.2   15.2     14.6
     28    10 27.99    +54 22.6    2.596    3.184  117.6   16.1     14.6
Apr.  2    10 08.63    +54 03.3    2.627    3.150  112.6   17.0     14.6
      7     9 50.83    +53 27.6    2.667    3.116  107.4   17.9     14.6
     12     9 34.90    +52 38.8    2.713    3.083  102.1   18.5     14.6
     17     9 20.94    +51 40.2    2.765    3.050   96.7   19.1     14.6
     22     9 08.93    +50 34.8    2.821    3.017   91.3   19.5     14.5

                      (C) Copyright 1997 CBAT
1997 February 20               (6563)              Brian G. Marsden

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