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IAUC 3886: 1983n

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                                                  Circular No. 3886
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 617-864-5758


PERIODIC COMET CROMMELIN (1983n)
     The following precise position by E. Everhart, Chamberlin
Observatory field station, is the only one since early September
that has been reported of the comet selected for the International
Halley Watch's 'dry run' during 1984 Mar. 25-31:

         1983 UT              R.A.   (1950.0)    Decl.

         Oct. 27.12326      19 47 54.73      +13 07 36.7

     The following new elements have been derived by the undersigned
from observations in 1956 and 1983.  The comet might attain
total mag m1 = 7-8 for a short while around perihelion passage:

       T = 1984 Feb. 20.1679 ET    Epoch = 1984 Mar. 1.0 ET
   Peri. = 195.8527                    e =   0.919195
   Node  = 250.1926   1950.0           a =   9.090085 AU
   Incl. =  29.1030                    n =   0.0359627
       q =   0.734522 AU               P =  27.406 years

     1983/84 ET  R.A. (1950.0) Decl.      p        r       m2

     Dec. 12    20 45.84    + 7 18.2    1.639    1.437    19.0
          22    21 07.93    + 6 40.5
     Jan.  1    21 33.90    + 6 13.0    1.495    1.172    18.5
          11    22 04.29    + 5 50.2

          21    22 39.68    + 5 22.1    1.301    0.928    17.9
          26    22 59.45    + 5 01.1
          31    23 20.68    + 4 32.1    1.190    0.829    17.6
     Feb.  5    23 43.38    + 3 51.8
          10     0 07.52    + 2 57.3    1.076    0.760    17.4
          15     0 33.02    + 1 45.7
          20     0 59.76    + 0 15.5    0.968    0.735    17.3
          25     1 27.63    - 1 32.8
     Mar.  1     1 56.54    - 3 36.9    0.878    0.758    17.3
           6     2 26.44    - 5 52.2
          11     2 57.29    - 8 12.8    0.815    0.826    17.4
          16     3 28.99    -10 32.0
          21     4 01.35    -12 42.8    0.788    0.924    17.4
          26     4 34.10    -14 39.1
          31     5 06.79    -16 16.5    0.799    1.041    17.5
     Apr.  5     5 38.95    -17 32.7
          10     6 10.07    -18 27.7    0.850    1.167    17.7


1983 November 10               (3886)              Brian G. Marsden

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