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IAUC 6398: C/1996 J1

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                                                  Circular No. 6398
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
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)
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET C/1996 J1 (EVANS-DRINKWATER)
     Further precise positions have been reported as follows:

     1996 UT             R.A. (2000) Decl.        m1    Observer
     May  10.44268   10 52 55.94   -23 22 52.0   16     Drinkwater
          12.60872   10 52 35.92   -23 06 05.6   16.5   Garradd
          12.61565   10 52 35.95   -23 06 02.5            "
          13.11309   10 52 32.44   -23 02 17.2   15.8   Offutt
          13.21946   10 52 31.59   -23 01 27.5   15.8     "
          13.44792   10 52 30.21   -22 59 43.4   15.6   Kushida
          13.45903   10 52 30.11   -22 59 37.0            "
          13.47424   10 52 29.95   -22 59 27.5          Garradd
          13.47698   10 52 29.93   -22 59 26.6            "

M. J. Drinkwater (Siding Spring).  Measurer R. H. McNaught.
G. J. Garradd (Loomberah).  0.25-m f/4.1 reflector + CCD.
W. Offutt (Cloudcroft).  0.60-m f/7 Ritchey-Chretien + CCD.
Y. Kushida (Yatsugatake).  0.40-m f/5 reflector + CCD.  Communicated
   by S. Nakano.

     Parabolic orbital elements from 11 observations May 10-13:

     T = 1996 Dec. 27.857 TT          Peri. =  13.763
                                      Node  = 278.908   2000.0
     q = 1.30192 AU                   Incl. =  22.457

1996 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
May  12    10 52.68    -23 10.8    2.708    3.312  118.5   15.5     15.9
     17    10 52.26    -22 32.9    2.712    3.260  114.2   16.4     15.8
     22    10 52.42    -21 56.8    2.719    3.208  109.9   17.3     15.7
     27    10 53.15    -21 23.1    2.727    3.155  105.7   18.0     15.7
June  1    10 54.44    -20 52.0    2.737    3.103  101.5   18.7     15.6
      6    10 56.28    -20 24.0    2.748    3.050   97.4   19.3     15.5

     R. M. West and L. Ramirez, European Southern Observatory, have
obtained four 5-min R frames of comet C/1996 J1 with the MPI/ESO
2.2-m telescope + EFOSC II at La Silla at May 13.15 UT.  The outer
contours of the coma are elliptical with largest diameters 90" and 120"
in p.a. 45 and 315 deg, respectively, and integrated R = 13.  There is a
broad tail in p.a. 315 deg.  The central light peak is diffuse and is
surrounded by a fanlike structure opening over 90 deg symmetrically
around p.a. 0 deg.

                      (C) Copyright 1996 CBAT
1996 May 13                    (6398)              Brian G. Marsden

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