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IAUC 3845: 1983j

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                                                  Circular No. 3845
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 IRAS (1983j)
     The following precise positions have been reported:

   1983 UT           R.A.   (1950.0)    Decl.     Observer

   July  6.62535     1 30 22.65    -19 07 58.0    Gilmore
         6.64144     1 30 23.41    -19 07 35.8      "
   July  9.43194     1 32 51.79    -18 04 23.8    Helin
        10.46458     1 33 43.72    -17 40 35.1    van den Bergh
        20.48062     1 40 37.76    -13 36 16.4    Gibson
        21.48305     1 41 09.61    -13 10 18.0      "

A. C. Gilmore (Mt. John Observatory).  Measurer: P. M. Kilmartin.
E. Helin, S. Swanson and E. Miles (Palomar Mountain Observatory).
   0.46-m Schmidt telescope.  Measurer: Swanson.
S. van den Bergh (Palomar).  1.2-m Schmidt.  Measurer: Swanson.
   Comet somewhat elongated, strong condensation, hint of tail.
J. Gibson (Palomar).  1.2-m Schmidt.

     The following elliptical orbital elements have been determined
by the undersigned from 13 observations June 30-July 21:

         T = 1983 Aug. 23.6947 ET
     Peri. = 356.8180                    e =   0.697836
     Node  = 357.1879   1950.0           a =   5.619008 AU
     Incl. =  46.1781                    n =   0.0739971
         q =   1.697860 AU               P =  13.320 years

     1983 ET     R.A. (1950.0) Decl.      p        r       m1

     July 25     1 42.77    -11 36.5    1.219    1.729    14.8
          30     1 44.32    - 9 15.5
     Aug.  4     1 44.92    - 6 44.3    1.100    1.712    14.5
           9     1 44.43    - 4 01.4
          14     1 42.71    - 1 05.5    0.990    1.701    14.3
          19     1 39.61    + 2 04.5
          24     1 34.98    + 5 29.1    0.896    1.698    14.1
          29     1 28.65    + 9 07.5
     Sept. 3     1 20.48    +12 57.4    0.826    1.702    13.9
           8     1 10.38    +16 54.2
          13     0 58.38    +20 51.6    0.787    1.713    13.8
          18     0 44.64    +24 41.4
          23     0 29.50    +28 15.2    0.786    1.730    13.9
          28     0 13.45    +31 25.6
     Oct.  3    23 57.12    +34 07.5    0.823    1.755    14.0


1983 July 26                   (3845)              Brian G. Marsden

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