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IAUC 7085: C/1999 A1

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                                                  Circular No. 7085
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  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET C/1999 A1 (TILBROOK)
     Further precise CCD positions have been reported:

     1999 UT             R.A. (2000) Decl.        m2    Observer
     Jan. 14.00713   23 39 32.00   -30 28 09.7          Griffin
          14.00940   23 39 32.42   -30 28 23.4            "
          14.01116   23 39 32.44   -30 28 28.9            "
          14.43183   23 39 50.53   -31 00 33.6   16.5   Garradd
          14.43264   23 39 50.59   -31 00 37.6   16.8     "
          14.43517   23 39 50.67   -31 00 49.0   16.3     "
          14.43851   23 39 50.84   -31 01 03.2   16.6     "
          14.44021   23 39 50.87   -31 01 11.4   16.5     "
          14.44119   23 39 50.94   -31 01 15.9   16.6     "
          14.44171   23 39 50.94   -31 01 18.0   16.3     "
          14.46525   23 39 51.99   -31 03 05.1          Zoltowski
          14.46944   23 39 52.20   -31 03 23.9            "
          14.47297   23 39 52.34   -31 03 40.2            "
          14.47664   23 39 52.50   -31 03 56.2   13.0     "

I. P. Griffin (Cocoa).  0.3-m f/5 reflector.  m1 = 13.5.
G. J. Garradd (Loomberah).  0.45-m f/5.4 reflector.
F. B. Zoltowski (Woomera).  0.30-m f/3.3 Schmidt-Cassegrain.

     Parabolic orbital elements from 22 observations Jan. 13-14:

     T = 1999 Jan. 29.395 TT          Peri. = 232.353
                                      Node  = 258.239   2000.0
     q = 0.73341 AU                   Incl. =  88.884

1999 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Jan. 12    23 37.75    -27 39.4    0.581    0.811   55.5   88.3      9.9
     17    23 41.27    -33 58.8    0.694    0.774   51.5   84.0     10.1
     22    23 41.89    -38 31.8    0.807    0.748   48.1   78.4     10.3
     27    23 40.01    -41 54.8    0.916    0.735   45.3   72.3     10.5
Feb.  1    23 36.09    -44 28.2    1.018    0.735   43.0   66.1     10.7
      6    23 30.65    -46 24.1    1.111    0.749   41.3   60.4     11.0
     11    23 24.24    -47 51.0    1.193    0.775   40.3   55.4     11.3
     16    23 17.36    -48 55.7    1.263    0.813   40.0   51.4     11.6
     21    23 10.35    -49 44.2    1.321    0.859   40.6   48.5     11.9
     26    23 03.43    -50 21.5    1.368    0.913   41.8   46.3     12.3
Mar.  3    22 56.68    -50 51.8    1.403    0.971   43.8   44.9     12.6

                      (C) Copyright 1999 CBAT
1999 January 14                (7085)              Brian G. Marsden

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