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IAUC 8118: P/2000 QD_181 = 1986 R1 = 1993 WU

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                                                  Circular No. 8118
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)
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COMET P/2000 QD_181 = 1986 R1 = 1993 WU (RUSSELL-LINEAR)
     R. H. McNaught, Siding Spring Observatory, reports
observations of a comet found in Sept. 1986 by K. S. Russell on a
90-min exposure taken by F. G. Watson earlier that month with the
U.K. Schmidt Telescope.  Unsuccessful attempts were made by Russell,
and later by McNaught, to locate the comet on the 30-min follow-up
exposure by M. Hartley obtained on Sept. 25.  T. B. Spahr, Minor
Planet Center, has recently identified the comet with 2000 QD_181,
an apparently asteroidal object observed by LINEAR on 2000 Aug. 31
and Sept. 5 (cf. MPS 18353), and itself linked by Spahr (MPO 9348)
to another LINEAR discovery 2000 XV_43 (observations Nov. 2000-Jan.
2001 on MPS 23109 and 25364), as well as to 1993 WU, recorded by
C. S. Shoemaker et al. with the 0.46-m Palomar Schmidt telescope on
1993 Nov. 19 and 20 (MPS 397), the appearance again being evidently
asteroidal.  With the knowledge of the clearly cometary orbit,
McNaught and M. A. Read have now located and measured the object on
the Hartley follow-up plate.  The 1986 observations, which have
been given the designation P/1986 R1, and orbital elements for the
respective epochs 1986 Nov. 26.0, 1993 Oct. 20.0, and 2000 Aug. 4.0
TT, follow:

     1986 UT             R.A. (2000) Decl.        m1    Observer
     Sept. 3.64300    0 47 48.78   -32 23 08.3   17     Watson
           3.70550    0 47 46.61   -32 23 13.8            "
          25.62655    0 27 27.46   -31 06 55.8          Hartley
          25.64738    0 27 25.95   -31 06 43.5            "

                    Epoch = 1986 Nov. 26.0 TT
     T = 1986 Dec.  4.8062 TT         Peri. = 357.7270
     e = 0.557259                     Node  =  39.0554  2000.0
     q = 1.595504 AU                  Incl. =  20.7524
       a =  3.603700 AU    n = 0.1440725    P =   6.841 years

                    Epoch = 1993 Oct. 20.0 TT
     T = 1993 Oct. 11.5441 TT         Peri. = 357.7477
     e = 0.555720                     Node  =  39.0418  2000.0
     q = 1.604777 AU                  Incl. =  20.7196
       a =  3.612080 AU    n = 0.1435714    P =   6.865 years

                    Epoch = 2000 Aug.  4.0 TT
     T = 2000 Aug. 17.6199 TT         Peri. = 357.7420
     e = 0.557054                     Node  =  39.0471  2000.0
     q = 1.596837 AU                  Incl. =  20.7496
       a =  3.605034 AU    n = 0.1439926    P =   6.845 years

                      (C) Copyright 2003 CBAT
2003 April 19                  (8118)            Daniel W. E. Green

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