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IAUC 6630: C/1997 G2

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                                                 Circular No. 6630
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 G2 (MONTANI)
     The following additional precise positions have been reported:

     1997 UT             R.A. (2000) Decl.        m1    Observer
     Apr. 14.45040   15 59 05.10   - 8 04 47.9   18.6   Scotti
          14.46004   15 59 04.71   - 8 04 50.0            "
          15.69447   15 58 13.18   - 8 09 33.6          Yamanishi
          15.70107   15 58 12.93   - 8 09 34.3            "
          15.70801   15 58 12.59   - 8 09 36.4            "
          15.75332   15 58 10.73   - 8 09 47.5   18.1   Chen
          15.75766   15 58 10.52   - 8 09 48.6            "
          15.76199   15 58 10.35   - 8 09 48.6            "
          15.76632   15 58 10.17   - 8 09 50.5            "
          16.64205   15 57 32.52   - 8 13 14.0   18.8   Sugie
          16.64552   15 57 32.39   - 8 13 15.2            "
          16.64899   15 57 32.26   - 8 13 14.9            "

J. Scotti (Kitt Peak).  0.9-m Spacewatch telescope + CCD.  m_2 =
   20.6.
M. Yamanishi, A. Miyamoto, M. Aimoto, and T. Oribe (Saji
   Observatory).  1.03-m f/4.2 reflector + CCD.  Comet diffuse;
   coma diameter about 10".
R. Chen and Y. J. Chen (Xinglong Station, Beijing Astronomical Obs.).
A. Sugie (Dynic Astronomical Observatory).  0.60-m f/5.0 reflector
   + CCD.

     Preliminary parabolic orbital elements by S. Nakano, Sumoto,
Japan, from 21 observations, Apr. 12-16:

     T = 1998 Apr. 16.215 TT          Peri. = 239.417
                                      Node  =  55.787   2000.0
     q = 3.10647 AU                   Incl. =  70.037

1997 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Apr. 12    16 00.72   - 7 55.6   3.826   4.646  140.7    7.8   18.1
     17    15 57.28   - 8 14.6   3.746   4.614  146.2    7.0   18.0
     22    15 53.44   - 8 34.8   3.672   4.581  151.7    6.0   17.9
     27    15 49.23   - 8 56.1   3.605   4.549  157.1    4.9   17.9
May   2    15 44.68   - 9 18.7   3.546   4.517  162.4    3.9   17.8
      7    15 39.85   - 9 42.5   3.495   4.485  167.3    2.8   17.7
     12    15 34.78   -10 07.6   3.453   4.453  170.8    2.1   17.7
     17    15 29.54   -10 33.9   3.420   4.422  171.2    2.0   17.6
     22    15 24.22   -11 01.5   3.395   4.390  168.0    2.7   17.6

                      (C) Copyright 1997 CBAT
1997 April 17                  (6630)            Daniel W. E. Green

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