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IAUC 4335: 1987h; 1987A

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                                                  Circular No. 4335
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444


PERIODIC COMET HOWELL (1987h)
     A. C. Gilmore and P. M. Kilmartin, Mount John University
Observatory, report that they have recovered this comet as shown
below. The object is diffuse with condensation.  Indicated corrections
to the predictions by S. Nakano (MPC 10519) and by S. W. Milbourn
(HBAA 1987, 72) are delta T = -0.20 and +0.06 day, respectively.

      1987 UT              R.A. (1950) Decl.            m2
      Mar.  6.67623     19 47 49.85     -22 04 10.4     18
            6.70424     19 47 54.91     -22 03 59.9
            7.67624     19 50 56.46     -21 58 50.8     18
            7.69822     19 51 00.59     -21 58 41.7

     The following improved orbital elements have been determined
by the undersigned from 41 observations 1981 Aug. 29-1987 Mar. 7:

         T = 1987 Apr. 14.5487 ET    Epoch = 1987 Mar. 26.0 ET
         W = 214.7433                    e =   0.508065
         O =  75.3172   1950.0           a =   3.277401 AU
         i =   5.5675                    n =   0.1661153
         q =   1.612268 AU               P =   5.933 years

     1987 ET      R.A. (1950) Decl.     Delta      r       m2
     Mar.  6    19 45.72    -22 07.7    2.109    1.657    17.8
          16    20 16.70    -21 06.8
          26    20 47.21    -19 47.6    1.966    1.623    17.6
     Apr.  5    21 16.98    -18 13.0
          15    21 45.80    -16 26.4    1.842    1.612    17.4
          25    22 13.50    -14 31.6
     May   5    22 39.93    -12 32.6    1.733    1.624    17.3
          15    23 04.96    -10 33.5
          25    23 28.51    - 8 37.9    1.633    1.658    17.3
     June  4    23 50.43    - 6 49.3
          14     0 10.58    - 5 10.8    1.535    1.713    17.3
          24     0 28.82    - 3 44.8
     July  4     0 44.89    - 2 33.9    1.436    1.784    17.3
          14     0 58.54    - 1 39.5
          24     1 09.48    - 1 03.1    1.337    1.868    17.3


SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
     Visual magnitude estimates by G. Garradd, Tamworth, N.S.W:
Mar. 6.40 UT, 4.4; 7.58, 4.4; 8.42, 4.4.


1987 March 9                   (4335)              Brian G. Marsden

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