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IAUC 5337: 1991 RB

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                                                  Circular No. 5337
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


1991 RB
     R. H. McNaught, Anglo-Australian Observatory, reports his
discovery of a fast-moving asteroidal object on an exposure by S. M.
Hughes with the U.K. Schmidt.  Available observations follow:

     1991 UT             R.A. (1950) Decl.        V     Observer
     Sept. 4.53554   22 18 58.33   -64 15 48.4   17.5   Hughes
           4.57721   22 18 28.37   -64 17 06.1            "
           5.50336   22 07 27.17   -64 44 23.7          McNaught
           5.53692   22 07 02.71   -64 45 16.6            "
           6.60845   21 52 41.65   -65 13 23.4            "
           6.61562   21 52 36.38   -65 13 31.4            "
           7.55185   21 38 40.09   -65 34 19.1            "

S. M. Hughes (Siding Spring).  Faint trail, the beginning of which is
   indistinct and one of three possibilities.
R. H. McNaught (Siding Spring).  Uppsala Southern Schmidt.  Faint
   images, especially on Sept. 5.503.  The Sept. 6.608 image is
   is involved with a galaxy.

     The following orbital elements satisfy only five of the above
seven positions, including the three singled out above:

     T = 1991 Nov. 5.734 ET           Peri. =  65.758
     e = 0.59192                      Node  = 357.419   1950.0
     q = 0.73450 AU                   Incl. =  22.882
       a =  1.79989 AU     n = 0.408164     P =   2.41 years

     1991 ET      R.A. (1950) Decl.     Delta      r        V
     Sept. 1    22 51.75    -62 19.4    0.257    1.180    17.6
           6    22 01.07    -64 57.5
          11    20 34.85    -65 56.8    0.172    1.086    17.0
          16    18 37.38    -61 26.4
          21    16 54.22    -46 59.3    0.113    0.994    17.0
          26    15 47.08    -24 19.6
     Oct.  1    15 04.59    - 3 00.9    0.127    0.908    20.0
           6    14 35.65    +11 15.7
          11    14 14.49    +19 41.0    0.205    0.832    21.6


1991 September 7               (5337)              Brian G. Marsden

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