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IAUC 4409: 1981 FD

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                                                  Circular No. 4409
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444


1981 FD
     This minor planet in 2:1 resonance with Jupiter has been
recovered by A. C. Gilmore and P. M. Kilmartin and confirmed by R. H.
McNaught as shown below.  The indicated correction to the ephemeris
on MPC 11353 (elements on MPC 9687) is delta T = -1.16 day.

    1987 UT            R.A. (1950) Decl.       Mag.  Observer
    May   7.58277   15 38 21.90   -22 03 16.4   18   Gilmore
          7.61130   15 38 20.08   -22 03 13.3          "
         30.52274   15 17 06.15   -21 08 08.2   19   McNaught
         30.53663   15 17 05.50   -21 08 08.2          "

A. C. Gilmore (Mount John Observatory).  0.6-m reflector.
R. H. McNaught (Siding Spring Observatory).  U.K. 1.2-m Schmidt.

     The following orbital elements are from a linkage of the above
observations with 25 at the discovery apparition in 1981:

         T = 1986 Nov. 21.9294 ET    Epoch = 1986 Nov. 26.0 ET
         W = 138.1772                    e =   0.476586
         O =  19.4416   1950.0           a =   3.230071 AU
         i =   2.5510                    n =   0.1697798
         q =   1.690665 AU               P =   5.805 years

     1987 ET      R.A. (1950) Decl.     Delta      r       V
     Mar.  6    15 47.18    -20 33.6    1.413    1.928    18.3
          16    15 55.18    -21 16.4
          26    15 59.53    -21 48.6    1.298    2.014    18.1
     Apr.  5    15 59.97    -22 10.1
          15    15 56.60    -22 20.7    1.222    2.107    17.8
          25    15 49.92    -22 19.9
     May   5    15 40.91    -22 08.0    1.214    2.204    17.6
          15    15 30.99    -21 47.4
          25    15 21.61    -21 22.2    1.301    2.305    17.7
     June  4    15 13.97    -20 57.6
          14    15 08.86    -20 38.1    1.484    2.408    18.4
          24    15 06.54    -20 26.7
     July  4    15 06.99    -20 24.6    1.745    2.512    19.0
          14    15 09.97    -20 31.6
          24    15 15.17    -20 46.4    2.062    2.616    19.6
     Aug.  3    15 22.27    -21 07.7
          13    15 30.99    -21 33.7    2.411    2.718    20.0


1987 June 14                   (4409)              Brian G. Marsden

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