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IAUC 6863: C/1998 G1

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                                                  Circular No. 6863
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 G1 (LINEAR)
     Of the many fast-moving asteroidal objects recently reported by the
Lincoln Laboratory Near-Earth Asteroid Research project, one has a
retrograde, nearly-parabolic orbit.  In response to our request, W. B.
Offutt coadded 12 CCD frames (appropriately shifted) of the object and notes
that "there appears to be a clear and unmistakable tail in p.a. 95 deg,
traceable out to 19" from the center of the nucleus; the tail is fairly
well defined and straight; the nucleus remains hard and well defined, and
I detect no coma".

     1998 UT             R.A. (2000) Decl.        m2    Observer
     Apr.  2.13056   11 08 19.60   +29 36 13.2   18.9   Blythe
           3.13816   11 05 47.52   +29 29 31.1   18.3     "
           3.54554   11 04 46.20   +29 26 45.5   17.4   Garradd
           4.51542   11 02 21.69   +29 19 48.9   18.0   Zoltowski
           4.54472   11 02 17.38   +29 19 34.0   17.9   Sugie
           4.57462   11 02 12.84   +29 19 20.4   17.9   Ikari
           5.13988   11 00 49.64   +29 15 07.8   17.6   Offutt
           5.51900   10 59 54.01   +29 12 18.2          Garradd
           5.80000   10 59 12.90   +29 10 02.8   18.4   Sarounova
           6.08351   10 58 31.60   +29 07 50.6   17.7   DeGraff

M. Blythe, F. Shelly and M. Bezpalko (Lincoln Laboratory ETS).  1-m
   f/2.15 reflector.  Measurers J. Stuart and H. Viggh.
G. J. Garradd (Loomberah).  0.25-m f/4.1 reflector.
F. Zoltowski (Woomera).  0.30-m f/3.3 Schmidt-Cassegrain.
A. Sugie (Dynic Astronomical Observatory).  0.60-m f/5.0 reflector.
Y. Ikari (Moriyama).  0.25-m f/6.3 Schmidt-Cassegrain.
W. B. Offutt (Cloudcroft).  0.60-m f/7 Ritchey-Chretien.
L. Sarounova (Ondrejov).  0.65-m f/3.6 reflector.
D. R. DeGraff and A. C. Schwortz (Alfred University).  0.81-m f/4 reflector.

     T = 1998 Oct. 15.550 TT          Peri. = 218.101
                                      Node  = 339.322   2000.0
     q = 2.55877 AU                   Incl. = 114.115

1998 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m2
Apr.  7    10 56.32    +29 00.5    2.489    3.256  133.1   13.0     18.3
     12    10 44.76    +28 15.7    2.517    3.225  127.3   14.3     18.4
     17    10 34.11    +27 24.0    2.555    3.194  121.3   15.6     18.4
     22    10 24.47    +26 26.8    2.600    3.164  115.4   16.7     18.5
     27    10 15.87    +25 25.5    2.652    3.134  109.5   17.6     18.5

                      (C) Copyright 1998 CBAT
1998 April 6                   (6863)              Brian G. Marsden

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