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IAUC 4750: 1989i

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                                                  Circular No. 4750
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


PERIODIC COMET PARKER-HARTLEY (1989i)
     The following precise positions have been reported:

     1989 UT             R.A. (1950) Decl.        m2    Observer
     Feb. 11.63317   10 52 05.32   - 0 04 23.6          Parker
          11.75817   10 52 02.52   - 0 04 11.3            "
     Mar.  3.45745   10 40 10.36   + 1 04 29.1   17     Gilmore
           3.50497   10 40 08.45   + 1 04 41.2             "
           4.50549   10 39 31.78   + 1 08 37.9             "
           4.53384   10 39 30.72   + 1 08 44.6             "
           4.69412   10 39 24.72   + 1 09 22.5          Hughes
           5.58784   10 38 52.07   + 1 12 57.4          McNaught

Q. A. Parker, S. Hughes, and K. S. Russell (Siding Spring).  1.2-m
  U.K. Schmidt telescope.  Measurer R. H. McNaught.  The weak, diffuse
  trail on the Feb. 11 sky-limited U 3-hr exposure was very difficult
  to measure.
A. C. Gilmore (Mt. John Observatory).  Measurer P. M. Kilmartin.
R. H. McNaught (Siding Spring).  Uppsala Southern Schmidt.  m1 about 18.

     The following orbital elements by R. H. McNaught indicate
a close approach (about 0.2 AU) to Jupiter in 1983:

     T = 1987 May  26.417 ET          Peri. = 173.633
     e = 0.24934                      Node  = 242.552   1950.0
     q = 3.08553 AU                   Incl. =   5.240
       a =  4.11045 AU     n = 0.118269     P =   8.33 years

     1989 ET      R.A. (1950) Decl.     Delta      r       m1
     Jan. 14    11 03.25    - 0 42.7    3.366    4.022    16.7
          24    11 00.61    - 0 39.5
     Feb.  3    10 56.54    - 0 25.1    3.199    4.064    16.6
          13    10 51.32    - 0 00.5
          23    10 45.39    + 0 32.3    3.132    4.107    16.6
     Mar.  5    10 39.23    + 1 10.6
          15    10 33.36    + 1 51.1    3.184    4.149    16.7
          25    10 28.26    + 2 30.5
     Apr.  4    10 24.30    + 3 05.9    3.352    4.191    16.8
          14    10 21.73    + 3 35.2
          24    10 20.65    + 3 56.7    3.611    4.232    17.1


1989 March 6                   (4750)             Daniel W. E. Green

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