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IAUC 7496: 2000 S1; 2000 DP107

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                                                  Circular No. 7496
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 2000 S1
     B. W. Koehn, Lowell Observatory, reports the discovery by
Brian A. Skiff of a comet on images taken in the course of the
LONEOS program.  Available CCD observations:

     2000 UT             R.A. (2000) Decl.        m1    Observer
     Sept.24.29782    0 31 11.97   -14 35 32.8   14.8   Skiff
          24.32105    0 31 10.83   -14 35 26.0            "
          24.34425    0 31 09.47   -14 35 19.6            "
          24.36749    0 31 08.30   -14 35 12.6            "
          25.86483    0 29 50.73   -14 27 35.7   16.0   Tichy
          25.86606    0 29 50.61   -14 27 35.9            "
          25.86712    0 29 50.49   -14 27 35.5            "

B. A. Skiff (Lowell Observatory).  Measurer B. W. Koehn.  0.59-m
  LONEOS Schmidt telescope.  Fan-shaped tail 2' long in p.a. about
  250 deg.
M. Tichy, M. Kocer, and P. Jelinek (Klet).  0.57-m f/5.2 reflector.
  Object apparently diffuse with coma diameter about 14".


2000 DP107
     S. J. Ostro, Jet Propulsion Laboratory (JPL); J.-L. Margot and
M. C. Nolan, Arecibo Observatory; L. A. M. Benner, R. F. Jurgens,
and J. D. Giorgini, JPL, write:  "Goldstone (8560-MHz, 3.5-cm)
delay-Doppler and Doppler-only radar observations on Sept. 22 and
23 strongly suggest that 2000 DP107 is a binary system.  The images
show separations up to at least 1 km between the components, which
have different sizes and rotation states.  Additional radar
observations are planned at Arecibo.  Follow-up optical
observations are desirable."
     Ephemeris from orbital elements on MPEC 2000-S37:

2000 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    V
Sept.26    21 22.69   -10 41.3   0.066   1.052  136.3   41.2   13.8
     27    21 34.85   - 7 45.1   0.072   1.057  138.9   38.6   13.9
     28    21 45.26   - 5 12.2   0.077   1.063  140.9   36.4   14.1
     29    21 54.25   - 2 59.6   0.083   1.069  142.5   34.8   14.2
     30    22 02.09   - 1 04.3   0.089   1.075  143.8   33.4   14.3
Oct.  1    22 08.99   + 0 36.1   0.095   1.080  144.7   32.4   14.4
      2    22 15.10   + 2 04.1   0.102   1.086  145.4   31.5   14.6
      3    22 20.57   + 3 21.4   0.108   1.092  145.9   30.9   14.7

                      (C) Copyright 2000 CBAT
2000 September 25              (7496)            Daniel W. E. Green

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