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IAUC 4200: 1986c; P/SCHWASSMANN-WACHMANN 1

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                                                  Circular No. 4200
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 HARTLEY 2 (1986c)
     The following precise positions have been reported:

    1986 UT           R.A.   (1950.0)  Decl.    m1   Observer

    Apr.  5.16007   11 06 00.40   - 4 47 36.4        Schwartz
          5.20583   11 05 58.52   - 4 47 15.6   18   Gibson
          5.21069   11 05 58.31   - 4 47 13.0          "
          5.21750   11 05 58.06   - 4 47 10.3          "

G. Schwartz (Oak Ridge Observatory).  1.5-m reflector.  Weak image.
   Measurer: C.-Y. Shao.
J. Gibson (Palomar Observatory).  1.5-m reflector + CCD.

     A computation from the observations Mar. 15-Apr. 5 confirms
this to be a short-period comet (cf. IAUC 4197).  The solar elongation
would have been too small to permit observations near perihelion.
The revolution period is somewhat uncertain, but the
comet evidently made a rather close approach to Jupiter in 1982.

          T = 1985 June 5.053 ET
      Peri. = 174.670                    e =   0.71563
      Node  = 226.609   1950.0           a =   3.37933 AU
      Incl. =   9.181                    n =   0.158657
          q =   0.96099 AU               P =   6.21 years

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

     Mar. 31    11 09.61    - 5 26.2    2.362    3.312    17.6
     Apr. 10    11 03.09    - 4 13.4
          20    10 58.59    - 3 10.7    2.641    3.446    18.0
          30    10 56.16    - 2 20.6
     May  10    10 55.68    - 1 43.8    3.001    3.575    18.4
          20    10 56.98    - 1 20.1
          30    10 59.81    - 1 08.7    3.407    3.699    18.8
     June  9    11 03.96    - 1 08.3
          19    11 09.21    - 1 17.7    3.825    3.818    19.2
          29    11 15.36    - 1 35.7
     July  9    11 22.25    - 2 01.1    4.230    3.932    19.6


PERIODIC COMET SCHWASSMANN-WACHMANN 1
     J.-C. Merlin and V. F. de Assis Neto, observing from Sao
Francisco de Oliveira, Brazil (0.31-m reflector), report total
visual magnitude estimates: Apr. 4.22 UT, 12.0; 5.24, 12.0.


1986 April 8                   (4200)              Brian G. Marsden

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