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IAUC 6626: 1997 G2; C/1997 D1

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                                                 Circular No. 6626
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)
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Phone 617-495-7244/7440/7444 (for emergency use only)


COMET 1997 G2
    J. Montani, Lunar and Planetary Laboratory, reports the
discovery of another comet with the Spacewatch 0.9-m telescope at
Kitt Peak.  The coma subtends 7"-8" on the exposures, taken in good
seeing.  A tail is plainly visible in the Apr. 12 CCD scans; the
main tail is 25" long in p.a. 355 deg, and fine streamers 20" and
15" long lie at p.a. 340 and 10 deg, respectively.

     1997 UT             R.A. (2000) Decl.        m1
     Apr. 12.46169   16 00 25.11   - 7 57 17.7   18.4
          12.47629   16 00 24.51   - 7 57 20.8   18.3
          12.49199   16 00 23.89   - 7 57 25.2   18.4
          13.32855   15 59 50.82   - 8 00 31.0   18.3
          13.33954   15 59 50.38   - 8 00 34.4   18.4
          13.35111   15 59 49.88   - 8 00 37.0   18.2
          13.35875   15 59 49.57   - 8 00 39.5   18.5
          13.36431   15 59 49.36   - 8 00 40.4   18.3
          13.37117   15 59 49.05   - 8 00 41.8   18.2


COMET C/1997 D1 (MUELLER)
     Ephemeris extension to IAUC 6563 (orbital elements MPC 29285):

1997 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Apr. 12     9 33.15   +52 33.7   2.663   3.033  101.9   18.9   13.4
     17     9 19.05   +51 33.1   2.713   2.997   96.5   19.4   13.4
     22     9 06.92   +50 25.6   2.767   2.962   91.1   19.8   13.4
     27     8 56.65   +49 13.8   2.825   2.928   85.8   20.0   13.4
May   2     8 48.06   +47 59.8   2.885   2.894   80.5   20.1   13.4
      7     8 40.97   +46 45.1   2.945   2.860   75.3   20.0   13.4
     12     8 35.20   +45 30.8   3.005   2.827   70.2   19.6   13.4
     17     8 30.57   +44 17.9   3.064   2.795   65.2   19.2   13.4
     22     8 26.91   +43 06.7   3.121   2.763   60.3   18.6   13.4
     27     8 24.09   +41 57.5   3.175   2.732   55.5   17.8   13.4
June  1     8 21.99   +40 50.5   3.226   2.701   50.8   16.9   13.4
      6     8 20.50   +39 45.8   3.272   2.671   46.2   15.9   13.3
     11     8 19.52   +38 43.3   3.314   2.642   41.6   14.8   13.3
     16     8 18.98   +37 42.9   3.350   2.614   37.2   13.6   13.3
     21     8 18.80   +36 44.4   3.380   2.586   32.8   12.3   13.3

                      (C) Copyright 1997 CBAT
1997 April 14                  (6626)            Daniel W. E. Green

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