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IAUC 5056: 1990 OA

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                                                  Circular No. 5056
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 OA
     B. Roman and E. Helin report their discovery of
a fast-moving asteroidal object, and the following positions
are available:

     1990 UT             R.A. (1950) Decl.       Mag.   Observer
     July 19.37031   20 36 54.47   -11 31 18.0   15.5   Helin
          19.40226   20 36 56.73   -11 32 16.8            "
          20.35330   20 38 15.06   -12 01 02.2            "
          20.45365   20 38 22.08   -12 04 03.2            "
          21.24583   20 39 27.77   -12 28 00.5            "
          21.45764   20 39 42.13   -12 34 27.5            "
          21.48230   20 39 45.01   -12 35 07.6   15.6   Tholen
          21.59870   20 39 52.76   -12 38 37.9            "
          22.48845   20 41 04.66   -13 04 57.2          Gilmore
          22.54227   20 41 08.31   -13 06 37.0   16       "

B. Roman, E. Helin, K. Lawrence, and J. Michaud (Palomar).  0.46-m
  Schmidt films.  Measured by Roman.
D. J. Tholen (Mauna Kea).  2.24-m telescope encoders.  Mean V
  magnitude; amplitude 1.2 mag.
A. C. Gilmore and P. M. Kilmartin (Mount John University
  Observatory).  0.25-m astrograph.

     Preliminary orbital elements by B. G. Marsden, Center for
Astrophysics, from the above observations:

     T = 1990 June 29.281 ET          Peri. = 153.155
     e = 0.42690                      Node  = 128.340   1950.0
     q = 1.24820 AU                   Incl. =   7.919
       a =  2.17798 AU     n = 0.306637     P =   3.21 years

     1990 ET      R.A. (1950) Decl.     Delta      r       V
     July 18    20 35.00    -10 49.6    0.254    1.262    15.7
          23    20 41.72    -13 20.7
          28    20 47.80    -15 49.4    0.267    1.281    15.5
     Aug.  2    20 53.32    -18 09.6
           7    20 58.40    -20 16.5    0.293    1.306    15.7
          12    21 03.14    -22 06.9
          17    21 07.65    -23 39.2    0.332    1.338    16.3


1990 July 23                   (5056)             Daniel W. E. Green

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