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IAUC 6951: C/1998 M3

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                                                  Circular No. 6951
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 C/1998 M3
     J. Larsen, Lunar and Planetary Laboratory, has discovered a comet
with the 0.9-m Spacewatch telescope.  Available CCD astrometry:

     1998 UT             R.A. (2000) Decl.        m1    Observer
     May  26.29656   16 43 58.22   - 4 51 11.4   18.9   Blythe
          26.31430   16 43 57.14   - 4 51 03.7   18.9     "
          26.33217   16 43 56.01   - 4 50 51.7   18.9     "
          26.34996   16 43 55.11   - 4 50 40.5   18.2     "
          26.36755   16 43 54.13   - 4 50 31.8   18.2     "
     June 24.26372   16 17 45.24   - 1 00 30.6   17.6   Larsen
          24.28486   16 17 44.16   - 1 00 22.5   17.4     "
          24.30618   16 17 43.14   - 1 00 13.7   17.6     "
          24.32783   16 17 41.96   - 1 00 02.9   18.0     "
          24.33236   16 17 41.73   - 1 00 02.2   17.8     "
          24.33629   16 17 41.55   - 1 00 00.1   17.8     "
          25.14598   16 17 01.84   - 0 54 36.8   17.6   Offutt
          25.15299   16 17 01.47   - 0 54 33.9   17.6     "
          25.15880   16 17 01.19   - 0 54 31.5   17.8     "
          25.16480   16 17 00.90   - 0 54 29.7   18.1     "

M. Blythe, F. Shelly and M. Bezpalko (Socorro).  1-m f/2.15 reflector.
   Measurers J. Stuart and    H. Viggh.  Prediscovery observations
   identified by the undersigned in LINEAR data.
J. Larsen (Kitt Peak).  Tail 0'.12 long in p.a. 323 deg.
W. Offutt (Cloudcroft).  0.6-m f/7 Ritchey-Chretien.  Coma 20" in diameter,
   densest toward p.a. 330 deg.  No tail seen in 200-s exposures.

     Parabolic orbital elements from 14 of the above observations:

     T = 1998 June 28.680 TT          Peri. =  18.978
                                      Node  = 255.513   2000.0
     q = 5.77004 AU                   Incl. = 113.387

1998 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
June 21    16 20.49    - 1 22.9    4.885    5.770  147.7    5.4     17.6
     26    16 16.34    - 0 49.0    4.928    5.770  142.8    6.1     17.6
July  1    16 12.41    - 0 17.6    4.978    5.770  137.7    6.8     17.6
      6    16 08.75    + 0 11.2    5.034    5.770  132.5    7.5     17.6
     11    16 05.37    + 0 37.5    5.097    5.771  127.3    8.1     17.6
     16    16 02.30    + 1 01.3    5.165    5.771  122.2    8.6     17.7

                      (C) Copyright 1998 CBAT
1998 June 25                   (6951)              Brian G. Marsden

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