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IAUC 6953: C/1998 M4

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                                                  Circular No. 6953
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 M4 (LINEAR)
     F. B. Zoltowski, Woomera; and P. J. Shelus, McDonald Observatory,
have independently reported that another LINEAR discovery, entered on the
Minor Planet Center's NEO Confirmation Page, is a comet.  CCD astrometry,
that by W. Offutt in response to the Central Bureau's request:

     1998 UT             R.A. (2000) Decl.        m1    Observer
     June 25.34676   19 46 02.51   -10 04 50.6   17.5   Blythe
          25.42039   19 45 50.99   -10 05 46.7            "
          26.60160   19 42 49.13   -10 20 22.3   14.7   Zoltowski
          26.62300   19 42 45.83   -10 20 38.3   14.8     "
          26.89961   19 42 03.12   -10 24 08.3   16.4   Casulli
          26.91956   19 41 59.94   -10 24 23.6          Tesi
          26.92338   19 41 59.32   -10 24 27.0            "
          26.92723   19 41 58.78   -10 24 28.4          Casulli
          27.02288   19 41 43.99   -10 25 42.0   17.2   Mallia
          27.02634   19 41 43.55   -10 25 41.8   16.5     "
          27.22651   19 41 12.43   -10 28 14.2   16.6   Offutt
          27.24335   19 41 09.77   -10 28 24.6   16.7     "
          27.33895   19 40 54.82   -10 29 35.7          Bell
          27.34928   19 40 53.14   -10 29 44.6            "
          27.36581   19 40 50.60   -10 29 56.6          Shelus
          27.37229   19 40 49.57   -10 30 01.5            "
          27.59352   19 40 15.38   -10 32 43.2   14.7   Zoltowski
          27.61536   19 40 11.94   -10 32 59.8   14.7     "

M. Blythe, F. Shelly and M. Bezpalko (Socorro).  1-m f/2.15 reflector.
   Measurers J. Stuart, H. Viggh and R. Sayer.
F. B. Zoltowski (Woomera).  0.30-m f/3.3 Schmidt-Cassegrain.  Moderately
   diffuse coma, faint 1' tail in p.a. 45 deg (June 26).
V. S. Casulli (Colleverde di Guidonia).  0.40-m f/3.2 reflector.
L. Tesi, A. Boattini and M. Tombelli (San Marcello Pistoiese).  0.4-m f/5
   reflector.  Measurers A. Boattini, G. Forti and L. Tesi.
F. Mallia, G. Masi and M. Di Soria (Campocatino).  0.80-m f/4.0 reflector.
W. Offutt (Cloudcroft).  0.6-m f/7 Ritchey-Chretien.  Well-defined
   condensation; small coma; broad, fanshaped (90-deg fan) tail with
   centerline at p.a. 45 deg, traced to about 30" from the nucleus.
G. Bell (Eskridge).  0.45-m f/4.5 reflector.  Measurer G. Hug.
P. J. Shelus (Fort Davis).  0.76-m f/3.0 reflector.  Some nebulosity, hint of
   tail extending roughly to the northeast.

                      (C) Copyright 1998 CBAT
1998 June 27                  (6953)              Brian G. Marsden

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