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IAUC 6979: P/1998 O1

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                                                  Circular No. 6979
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 P/1998 O1 (SHOEMAKER-LEVY 7)
     J. V. Scotti, Lunar and Planetary Laboratory, reports his recovery of
comet P/1991 V2 (= 1991 d1 = 1991 XIX) with the Spacewatch telescope on
Kitt Peak.  The coma was of diameter 6".  On July 25.46, m2 = 22.5, and a tail
extended 0'.5 in p.a. 264 deg.  On July 26.46, m2 = 22.1, and there was a
faint tail extending 0'.15 in p.a. 275 deg.  The indicated correction to the
prediction by B. G. Marsden on MPC 25183 (ephemeris on MPC 31835) is
Delta T = -0.7 day.

     1998 UT             R.A. (2000) Decl.        m1
     July 25.42696    3 44 14.39   +28 47 29.5   20.7
          25.44572    3 44 17.61   +28 47 42.9   20.4
          25.46292    3 44 20.63   +28 47 54.6
          26.45868    3 47 14.10   +28 59 13.6
          26.46336    3 47 14.88   +28 59 16.5   20.3
          26.46762    3 47 15.71   +28 59 19.5   20.1

     Improved orbital elements from 32 observations 1991-1998:

                    Epoch = 1998 Aug. 15.0 TT
     T = 1998 Aug. 24.5726 TT         Peri. =  95.5287
     e = 0.531116                     Node  = 309.5159  2000.0
     q = 1.697219 AU                  Incl. =  10.0889
       a =  3.619696 AU    n = 0.1431185    P =   6.887 years

1998 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
July 26     3 45.90    +28 54.1    1.935    1.721   62.5   31.6     20.0
Aug.  5     4 15.23    +30 37.4    1.859    1.708   65.4   32.7     19.8
     15     4 44.90    +31 59.1    1.788    1.700   68.4   33.6     19.7
     25     5 14.47    +32 57.9    1.719    1.697   71.6   34.4     19.6
Sept. 4     5 43.39    +33 33.9    1.653    1.700   75.1   35.0     19.5
     14     6 11.14    +33 48.4    1.589    1.709   78.8   35.3     19.5
     24     6 37.12    +33 44.2    1.526    1.722   83.1   35.3     19.5
Oct.  4     7 00.81    +33 24.8    1.464    1.741   87.8   35.0     19.4
     14     7 21.72    +32 54.6    1.403    1.764   93.1   34.4     19.4
     24     7 39.36    +32 18.1    1.343    1.792   99.1   33.2     19.4
Nov.  3     7 53.29    +31 39.5    1.284    1.825  105.8   31.5     19.5
     13     8 03.10    +31 02.2    1.229    1.860  113.5   29.2     19.5
     23     8 08.39    +30 28.6    1.180    1.900  122.2   26.1     19.5
Dec.  3     8 08.95    +29 58.7    1.139    1.942  131.9   22.2     19.6

                      (C) Copyright 1998 CBAT
1998 July 27                   (6979)              Brian G. Marsden

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