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IAUC 7501: C/2000 S3

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                                                  Circular No. 7501
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)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET C/2000 S3
     On Oct. 1, B. W. Koehn communicated his measurements of a
comet, later reported as discovered by B. A. Skiff on images taken
on Sept. 29 by M. E. Van Ness in the course of the LONEOS program
at Lowell Observatory.  Skiff described a nearly circular coma of
diameter 15" with moderate condensation.  Following tentative
linkage by B. G. Marsden, Center for Astrophysics, to one (mag
about 19) of about 2000 asteroidal objects recorded on Sept. 20 by
LINEAR, a tentative ephemeris was provided on the NEO Confirmation
Page.  This linkage was confirmed by observations obtained on Oct.
2 by J. G. Ries with the 0.76-m reflector at McDonald Observatory.
Skiff adds that observations by L. H. Wasserman with the 1.1-m
telescope at Lowell Observatory on Oct. 2 showed a 14" x 11" coma,
elongated east-west.  Positions, orbit, and ephemeris follow:

     2000 UT             R.A. (2000) Decl.        m1    Observer
     Sept.20.33024    0 59 03.38   -21 43 42.8          LINEAR
          20.34573    0 59 02.57   -21 43 39.5            "
          20.36106    0 59 01.91   -21 43 34.9            "
          20.37617    0 59 01.20   -21 43 30.3            "
          20.39095    0 59 00.39   -21 43 26.3            "
          29.26958    0 51 46.10   -21 01 00.7   17.7   Van Ness
          29.27891    0 51 45.60   -21 00 57.2            "
          29.28826    0 51 45.18   -21 00 53.8            "
          29.29753    0 51 44.66   -21 00 51.4            "
     Oct.  2.26013    0 49 16.18   -20 42 59.5          Ries
           2.26713    0 49 15.84   -20 42 57.1            "
           2.27394    0 49 15.46   -20 42 54.7            "

     T = 2000 July 15.867 TT          Peri. = 298.162
     e = 0.77299                      Node  =  41.137   2000.0
     q = 2.66273 AU                   Incl. =  25.179
       a = 11.72976 AU     n = 0.024534     P =  40.17 years

2000 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Sept.23     0 56.93   -21 32.6   1.799   2.738  154.4    9.1   17.6
Oct.  3     0 48.65   -20 38.2   1.821   2.761  155.2    8.7   17.7
     13     0 40.62   -19 22.8   1.868   2.787  151.6    9.8   17.8
     23     0 33.71   -17 48.3   1.941   2.815  145.1   11.7   17.9

                      (C) Copyright 2000 CBAT
2000 October 2                 (7501)            Daniel W. E. Green

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