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IAUC 6550: C/1997 C1

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                                                  Circular No. 6550
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 C1 (GEHRELS)
     Further precise CCD positions have been reported as follows:

     1997 UT             R.A. (2000) Decl.        m1    Observer
     Feb.  2.15372    9 11 06.61   +12 19 34.2   18.0   Offutt
           2.19910    9 11 05.07   +12 19 41.5   18.1     "
           2.50728    9 10 54.60   +12 20 28.6   17.1   Abe
           2.51690    9 10 54.20   +12 20 28.8            "
           2.60463    9 10 51.16   +12 20 41.3          Yan
           2.61329    9 10 50.87   +12 20 43.4   17.8     "
           2.81785    9 10 44.12   +12 21 15.3   18.0   Ticha
           2.82769    9 10 43.84   +12 21 16.5            "
           2.95108    9 10 39.47   +12 21 35.7   17.0   Laurie
           3.00616    9 10 37.57   +12 21 44.7            "
           3.64445    9 10 16.05   +12 23 23.2   17.3   Asami
           3.65579    9 10 15.59   +12 23 23.4            "

W. Offutt (Cloudcroft).  0.6-m f/7 Ritchey-Chretien.  Near-stellar
   condensation about 6", no significant coma, tail discernible
   to about 80" in p.a. 287 deg.
H. Abe (Yatsuka).  0.26-m f/6 reflector.  Communicated by S. Nakano.
H. J. Yan and Y. J. Chen (Xinglong).  0.60-m Schmidt.  Measurer Chen.
J. Ticha and M. Tichy (Klet).  0.57-m f/5.2 reflector.  Measurer Tichy.
S. P. Laurie (Church Stretton).  0.25-m Schmidt-Cassegrain.
A. Asami (Hadano).  0.2-m f/6 reflector.  Communicated by S. Nakano.

     The following very uncertain, parabolic orbital elements are from 20
observations Feb. 1-3.  It seems likely that the comet is of short period.

     T = 1998 Apr. 20.929 TT          Peri. =  31.014
                                      Node  = 203.382   2000.0
     q = 2.17053 AU                   Incl. =   3.269

1997 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Feb.  1     9 11.75    +12 16.7    4.128    5.109  174.2    1.1     17.2
      6     9 08.93    +12 29.5    4.084    5.068  176.0    0.8     17.1
     11     9 06.06    +12 42.8    4.048    5.028  171.9    1.6     17.0
     16     9 03.20    +12 56.4    4.021    4.987  166.5    2.6     17.0
     21     9 00.41    +13 09.9    4.000    4.946  160.9    3.7     17.0
     26     8 57.73    +13 23.3    3.988    4.905  155.3    4.8     16.9
Mar.  3     8 55.22    +13 36.3    3.982    4.864  149.7    5.9     16.9

                      (C) Copyright 1997 CBAT
1997 February 3                (6550)              Brian G. Marsden

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