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IAUC 6624: C/1997 G1; 121P

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                                                  Circular No. 6624
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 G1 (MONTANI)
     Further precise CCD positions have been reported as follows:

     1997 UT             R.A. (2000) Decl.        m1    Observer
     Apr. 11.13696    7 17 20.38   +19 57 35.5   19.0   Montani
          11.14571    7 17 20.71   +19 57 34.5   19.2     "
          11.17508    7 17 21.80   +19 57 31.0   19.1   Balam
          11.17792    7 17 21.86   +19 57 31.1   19.0     "
          12.22310    7 18 00.11   +19 56 20.7   18.8     "
          12.22553    7 18 00.26   +19 56 20.4   18.8     "
          12.23037    7 18 00.43   +19 56 19.7   18.8     "

J. Montani (Lunar and Planetary Laboratory).  0.9-m Spacewatch
   telescope.  Measurer J. V. Scotti.
D. D. Balam (University of Victoria).  1.8-m Plaskett telescope.

     The following parabolic orbital elements, from 13 observations
Apr. 9-12, are extremely uncertain.  Nevertheless, it seems likely
that the comet is quite far from the earth and perhaps of short period.

     T = 1997 Sept.14.987 TT          Peri. = 241.457
                                      Node  = 263.385   2000.0
     q = 4.30578 AU                   Incl. =   3.667

1997 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Apr. 12     7 17.87    +19 56.6    4.450    4.494   86.1   12.9     18.8
     22     7 24.59    +19 43.5    4.573    4.472   77.9   12.7     18.8
May   2     7 32.39    +19 26.8    4.692    4.450   70.1   12.3     18.8
     12     7 41.13    +19 06.3    4.805    4.430   62.5   11.7     18.9
     22     7 50.66    +18 41.6    4.911    4.411   55.2   10.9     18.9
June  1     8 00.87    +18 12.7    5.007    4.394   48.0    9.9     18.9
     11     8 11.62    +17 39.3    5.093    4.379   41.1    8.8     18.9


COMET 121P/SHOEMAKER-HOLT 2
     Total visual magnitude estimates: Jan. 3.41 UT, 13.5 (A. Hale,
Cloudcroft, NM, 0.41-m reflector); 9.40, 13.6 (Hale); Feb. 2.90, 14.3
(K. Hornoch, Lelekovice, Czech Republic, 0.35-m reflector);
7.04, 13.7 (G. Bakos, Raktanya, Hungary, 0.44-m reflector);
8.96, 13.9 (J. Carvajal, Madrid, Spain, 0.44-m reflector);
Mar. 1.82, 13.8: (Hornoch); 4.81, 14.1 (Hornoch); 7.98, 14.7 (K. Szentasko,
Raktanya, Hungary, 0.44-m reflector); 12.93, 14.4 (Hornoch);
Apr. 2.92, 13.7 (K. Sarneczky, Raktanya, Hungary, 0.44-m reflector).

                      (C) Copyright 1997 CBAT
1997 April 12                  (6624)              Brian G. Marsden

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