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IAUC 5305: 1991r

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                                                  Circular No. 5305
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


COMET HELIN-ALU (1991r)
     The following precise positions have been reported:

     1991 UT             R.A. (1950) Decl.        m1    Observer
     July  8.56424   16 24 54.73   -19 23 28.0   16.5   Seki
           8.57674   16 24 54.59   -19 23 20.6            "
           8.57917   16 24 54.38   -19 23 19.3   16.0   Otomo
          10.08134   16 24 26.31   -19 13 11.7          McCrosky
          10.10049   16 24 25.88   -19 13 03.4            "
          11.07912   16 24 08.33   -19 06 30.5            "
          11.09525   16 24 08.09   -19 06 24.3            "
          13.10329   16 23 34.24   -18 53 07.0            "
          13.12076   16 23 33.98   -18 52 59.6            "

T. Seki (Geisei).  0.6-m reflector.  Communicated by S. Nakano.
S. Otomo (Otomo).  0.25-m f/3.4 reflector.  Measurer O. Muramatsu.
R. E. McCrosky, C.-Y. Shao, Z. Ceplecha, B. G. Marsden and G. V.
   Williams (Oak Ridge).  1.5-m reflector + CCD.  Measurer Shao.

     Parabolic orbital elements from 16 observations June 13-July 13:

     T = 1992 Feb. 17.467 ET          Peri. =  30.319
                                      Node  = 252.946   1950.0
     q = 4.87351 AU                   Incl. =  49.539

     1991 ET      R.A. (1950) Decl.     Delta      r       m1
     July  3    16 26.87    -20 02.0    4.297    5.188    15.8
          13    16 23.60    -18 53.8
          23    16 21.50    -17 51.0    4.456    5.137    15.9
     Aug.  2    16 20.67    -16 54.5
          12    16 21.14    -16 04.7    4.687    5.091    15.9
          22    16 22.91    -15 21.2
     Sept. 1    16 25.89    -14 43.6    4.953    5.048    16.0
          11    16 30.02    -14 10.8
          21    16 35.20    -13 41.8    5.221    5.010    16.1
     Oct.  1    16 41.32    -13 15.6
          11    16 48.29    -12 50.9    5.462    4.977    16.2
          21    16 55.98    -12 26.6
          31    17 04.30    -12 01.6    5.656    4.947    16.2


1991 July 13                   (5305)              Brian G. Marsden

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