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IAUC 4704: 1989c; 1989b

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                                                  Circular No. 4704
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 BRADFIELD (1989c)
     D. Herald, Kambah, near Canberra, provides the following
precise positions:

     1989 UT             R.A. (1950) Decl.       m1
     Jan.  7.45612   21 20 11.60   -55 56 21.1   11
           7.46557   21 20 18.13   -55 55 58.3
           7.47259   21 20 22.68   -55 55 50.6

Stars (of mag 12) were involved with the first two images of the
comet, and the third image was overexposed.  The comet is diffuse,
with neither condensation nor tail.


COMET HELIN-ROMAN-CROCKETT (1989b)
     The following precise positions have been reported:

     1989 UT             R.A. (1950) Decl.        m1    Observer
     Jan.  4.97639    8 36 02.93   +21 28 27.7    17    Mulholland
           6.27020    8 35 16.67   +21 32 50.4          Shao

J. D. Mulholland and A. Maury (Caussols).  0.9-m Schmidt telescope.
   Measurer R. Chemin.  Communicated by C. Pollas.
C.-Y. Shao (Oak Ridge Observatory).  1.5-m reflector.

     The following parabolic orbital elements satisfy the four
accurate positions Jan. 3-6 but are extremely uncertain.  It is
at least equally likely that the object is a distant short-period
comet with very low e.  As with 1989 AC (cf. IAUC 4702), low i, coupled
in this case with small apparent motion, renders the orbit particularly
indeterminate.

     T = 1988 June 24.31 ET           Peri. = 327.91
                                      Node  =  86.52    1950.0
     q = 2.2137 AU                    Incl. =   3.58

     1988/89      R.A. (1950) Decl.     Delta      r       m1
     Dec. 25     8 41.62    +20 53.0    2.161    3.023    15.5
     Jan.  4     8 36.62    +21 25.2
          14     8 30.37    +21 58.7    2.201    3.171    15.7
          24     8 23.69    +22 29.8
     Feb.  3     8 17.39    +22 55.5    2.354    3.323    16.1


1989 January 7                 (4704)              Brian G. Marsden

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