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IAUC 4255: 1986m; 1986l; AM Her

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                                                  Circular No. 4255
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 GRIGG-SKJELLERUP (1986m)
     K. Birkle, Max-Planck-Institut fur Astronomie, Heidelberg,
reports his recovery of this comet with the 3.5-m telescope at Calar
Alto, using a CCD camera at the prime focus.  His positions are in
close agreement with the predicted elements on MPC 10519.  The
comet was stellar in appearance, with an R magnitude of ~ 22.

          1986 UT               R.A.    (1950)   Decl.

          Aug. 12.16108       5 49 51.61      +11 24 17.6
               13.14881       5 51 00.12      +11 20 52.0
               13.16026       5 51 00.90      +11 20 49.5
               13.16859       5 51 01.48      +11 20 47.6
               13.17492       5 51 01.90      +11 20 46.2


COMET WILSON (1986l)
     Improved parabolic orbital elements from MPC 11153:

         T = 1987 Apr. 20.8587 ET  Peri. = 238.2680
                                   Node  = 110.9259   1950.0
         q =   1.200093 AU         Incl. = 147.1395

     1986 ET     R.A. (1950.0) Decl.      p        r       m1

     Sept.17    20 55.72    +15 35.1
          27    20 37.19    +11 57.1    2.383    3.080    10.3
     Oct.  7    20 21.62    + 8 14.5
          17    20 09.40    + 4 40.6    2.486    2.862    10.0
          27    20 00.44    + 1 23.8
     Nov.  6    19 54.49    - 1 32.6    2.657    2.641     9.8
          16    19 51.15    - 4 08.2
          26    19 50.02    - 6 24.8    2.819    2.420     9.6
     Dec.  6    19 50.71    - 8 25.2
          16    19 52.87    -10 12.3    2.911    2.198     9.2


AM HERCULIS
     Further visual magnitude estimates (cf. IAUC 4234):  July 10,
13.5 (M. Verdenet, Bourbon-Lancy, France); 14, 14.6 (Verdenet); 16,
14.8 (Verdenet); Aug. 4.3, 13.9 (A. Mizser, Amherst, NH); 12.92,
14.4 (R. Monella, Covo, Italy); 20.94, 14.2 (Monella); 25.90, 14.1
(Monella); 28.86, 14.2 (Monella); 29.8, 14.3 (Mizser, Rak-tanya,
Hungary); 30.90, 14.3 (Monella).


1986 September 17              (4255)            Daniel W. E. Green

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