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IAUC 5064: 1990 OS; V854 Cen

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                                                  Circular No. 5064
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


1990 OS
     E. Helin reports her discovery of a fast-moving minor planet on a
July 21 film obtained by B. Roman, K. Lawrence, J. Michaud and herself
with the 0.46-m Schmidt telescope at Palomar.  The object was confirmed
on a July 26 exposure by H. E. Holt and D. H. Levy with the same
telescope.  The following measurements are by Roman and Lawrence:

     1990 UT             R.A. (1950) Decl.       Mag.
     July 21.41111   21 17 55.70   -24 22 57.9   16.0
          21.43889   21 18 03.75   -24 22 49.1
          26.35677   21 53 45.52   -23 33 57.1   16.3
          26.38785   21 54 02.25   -23 33 23.3

     There is noticeable apparent acceleration, and the following orbital
elements, although very uncertain, indicate a close approach to the earth.
Further positions are urgently required.

     T = 1990 Sept. 18.939 ET         Peri. =  27.648
     e = 0.40707                      Node  = 341.819   1950.0
     q = 0.89899 AU                   Incl. =   1.087
       a =  1.51620 AU     n = 0.527924     P =   1.87 years

     1990 ET      R.A. (1950) Decl.     Delta      r        V
     July 28    22 11.66    -22 54.1    0.064    1.074    15.2
          29    22 24.83    -22 20.6
          30    22 40.14    -21 36.0    0.054    1.063    14.9
          31    22 57.97    -20 36.4
     Aug.  1    23 18.73    -19 17.1    0.046    1.052    14.7
           2    23 42.79    -17 32.0
           3     0 10.35    -15 15.1    0.039    1.041    14.6
           4     0 41.29    -12 22.4
           5     1 14.97    - 8 54.5    0.035    1.031    14.8
           6     1 50.22    - 5 00.3
           7     2 25.48    - 0 56.0    0.034    1.020    15.2


V854 CENTAURI
     Visual magnitude estimates by P. F. Williams, Heathcote, N.S.W.:
June 2.39 UT, 11.5; 15.49, 10.9; 24.48, 9.9; 28.49, 9.5; July 4.51, 8.9.


1990 July 28                   (5064)              Brian G. Marsden

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