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IAUC 4795: 1989k

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                                                  Circular No. 4795
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 WEST-HARTLEY (1989k)
     R. M. West, European Southern Observatory, has measured the
following precise positions from exposures taken by G. Pizarro with
the 1-m Schmidt in somewhat less than perfect conditions.  The comet
appears as a condensation in a halo, with a weak tail about 1 arcmin
long on the western side of each trail.

     1989 UT             R.A. (1950) Decl.       m1
     May  31.13056   13 55 12.82   -10 48 44.1   18
          31.17222   13 55 11.79   -10 48 54.4
     June  1.10486   13 54 51.37   -10 52 29.5
           1.14653   13 54 50.28   -10 52 42.8

     Improved orbital elements by the undersigned from the four sets
of trail-end observations Mar. 14-June 1:

     T = 1988 Oct.  6.1990 ET         Peri. = 102.7618
     e = 0.446367                     Node  =  46.1242  1950.0
     q = 2.133078 AU                  Incl. =  15.3741
       a =  3.852873 AU    n = 0.1303248    P =   7.563 years

     1989 ET      R.A. (1950) Decl.     Delta      r       m1
     May  14    14 05.04    - 9 52.1    1.720    2.691    17.0
          24    13 58.51    -10 23.1
     June  3    13 54.23    -11 00.0    1.932    2.775    17.4
          13    13 52.37    -11 43.2
          23    13 52.85    -12 32.3    2.217    2.860    17.8
     July  3    13 55.47    -13 26.7
          13    14 00.00    -14 25.5    2.548    2.947    18.2
          23    14 06.19    -15 27.7
     Aug.  2    14 13.81    -16 32.5    2.901    3.034    18.6
          12    14 22.66    -17 39.0
          22    14 32.56    -18 46.2    3.255    3.121    19.0
     Sept. 1    14 43.36    -19 53.4
          11    14 54.95    -20 59.9    3.594    3.208    19.3
          21    15 07.21    -22 05.0
     Oct.  1    15 20.05    -23 08.1    3.902    3.295    19.6
          11    15 33.38    -24 08.6
          21    15 47.11    -25 06.0    4.167    3.381    19.9


1989 June 8                    (4795)              Brian G. Marsden

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