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IAUC 6755: P/1997 T3

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                                                  Circular No. 6755
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 P/1997 T3
     Further precise CCD positions have been reported as follows:

     1997 UT             R.A. (2000) Decl.        m2    Observer
     Oct.  6.99668    1 14 23.30   + 2 59 08.2   19.0   Tichy
           7.00264    1 14 23.13   + 2 59 07.4            "
           7.00669    1 14 23.00   + 2 59 06.6            "
           7.28978    1 14 14.58   + 2 58 25.2   18.8   Offutt
           7.34699    1 14 12.83   + 2 58 16.2   18.5     "
           7.38441    1 14 11.71   + 2 58 10.0   18.5     "
           7.87075    1 13 57.21   + 2 56 57.2          Pravec
           7.90740    1 13 56.08   + 2 56 52.1            "
           7.93979    1 13 55.10   + 2 56 46.9   19.0     "

M. Tichy and Z. Moravec (Klet).  0.57-m f/5.2 reflector.  No evident coma or
   tail.  Comparison with the Bochum images suggests the tail was too
   faint to show, even on coaddition of the Klet images.
W. Offutt (Cloudcroft).  0.6-m f/7 Ritchey-Chretien.  No coma or tail
   immediately apparent.  Subsequent careful inspection consistently
   revealed a possible trace of tail, up to 17" in p.a. 247 deg.
P. Pravec (Ondrejov).  0.65-m f/3.6 reflector.  No coma, but very faint
   tail on individual 3-min clear-filter exposures, the coaddition of
   three images confirming a tail 25" long in p.a. 240 deg.

     The general elliptical orbital elements below are from the 16
observations above and on IAUC 6754.  The observations can also be
satisfied by a low-eccentricity Jupiter-Trojan orbit, though not, it
seems, by a parabola.

     T = 1997 Nov.  1.809 TT          Peri. = 311.119
     e = 0.49983                      Node  =  70.171   2000.0
     q = 3.76725 AU                   Incl. =   4.162
       a =  7.53198 AU     n = 0.047680     P =  20.67 years

1997 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m2
Sept.29     1 18.24    + 3 19.4    2.794    3.773  165.9    3.7     19.0
Oct.  4     1 15.87    + 3 06.8    2.780    3.772  170.9    2.4     18.9
      9     1 13.39    + 2 54.2    2.774    3.770  175.0    1.3     18.8
     14     1 10.86    + 2 42.1    2.775    3.769  174.4    1.5     18.8
     19     1 08.37    + 2 30.9    2.783    3.768  170.0    2.6     18.9
     24     1 05.96    + 2 20.9    2.799    3.768  164.8    4.0     19.0
     29     1 03.70    + 2 12.5    2.821    3.767  159.5    5.3     19.1

                      (C) Copyright 1997 CBAT
1997 October 7                 (6755)              Brian G. Marsden

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