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IAUC 4311: 1987e; 1986m

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                                                  Circular No. 4311
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 WILD 3 (1987e)
     The following orbital elements by the undersigned are from 28
observations 1980-1987 (mean residual 1".0) with full perturbations:

         T = 1987 Sept. 1.0586 ET    Epoch = 1987 Sept. 2.0 ET
     Peri. = 179.5697                    e =   0.367464
         O =  71.9931   1950.0           a =   3.623306 AU
         i =  15.4547                    n =   0.1429047
         q =   2.291871 AU               P =   6.90 years

     1987 ET      R.A. (1950) Decl.     Delta      r       m1
     Jan.  5    13 50.16    + 4 10.4    2.772    2.774    19.9
          15    14 01.52    + 3 35.6
          25    14 11.82    + 3 10.8    2.453    2.709    19.4
     Feb.  4    14 20.81    + 2 56.4
          14    14 28.17    + 2 52.4    2.145    2.645    19.0
          24    14 33.60    + 2 58.3
     Mar.  6    14 36.79    + 3 12.8    1.869    2.585    18.5
          16    14 37.46    + 3 33.5
          26    14 35.48    + 3 56.6    1.649    2.529    18.1
     Apr.  5    14 30.92    + 4 17.2
          15    14 24.20    + 4 29.1    1.509    2.477    17.8
          25    14 16.04    + 4 26.4
     May   5    14 07.44    + 4 04.5    1.465    2.430    17.6
          15    13 59.55    + 3 20.9
          25    13 53.29    + 2 16.4    1.517    2.389    17.6
     June  4    13 49.35    + 0 53.1
          14    13 48.08    - 0 45.3    1.644    2.355    17.7
          24    13 49.51    - 2 35.2
     July  4    13 53.56    - 4 33.2    1.819    2.327    17.8


PERIODIC COMET GRIGG-SKJELLERUP (1986m)
     P. A. Wehinger, Arizona State University, and M. J. S. Belton,
Kitt Peak National Observatory, report that spectra were obtained
of this comet on Jan. 31 and Feb. 1 and 2 with the Cerro Tololo
Interamerican Observatory 4-m reflector (+ 2D-Frutti photon-counting
system; spectral range 350-650 nm, resolution 0.44 nm).  A continuum
was detected with emission features of the CN(0,0) violet system
and C3.  Identification of other possible emission features await
further data processing.  On Feb. 1.1 and 2.1 UT, m1 = 20.6.


1987 February 5                (4311)            Daniel W. E. Green

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