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IAUC 4480: 1987a1; 1987p

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                                                  Circular No. 4480
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 MUELLER (1987a1)
     The following precise positions have been reported:

  1987 UT            R. A.  (1950)  Decl.         m1     Observer
  Oct. 18.33524     1 12 44.64    +12 25 54.3            Shoemaker
       19.48020     1 11 52.73    +12 24 44.8               "
       20.28055     1 11 17.11    +12 23 57.5    17.5       "
       21.35399     1 10 29.02    +12 22 48.7               "
       22.23375     1 09 50.45    +12 21 57.9            Shao
       23.17817     1 09 08.66    +12 20 49.9            McCrosky
       24.22304     1 08 23.41    +12 19 40.4            Shao

E. and C. Shoemaker and H. Holt (Palomar).  0.46-m Schmidt
   telescope. Comet near edge of films on Oct. 18 and 19.
C.-Y. Shao and R. E. McCrosky (Oak Ridge Observatory).  1.55-m
  reflector. Measured by Shao.  Oct. 22 image weak, inkdot measured.
  On Oct. 23, diffuse with no apparent condensation.

     Orbital elements by the undersigned, from 6 observations Oct.
18-24, show this to be a short-period comet:

         T     = 1987 Oct. 18.322 ET
         Peri. =  18.879                     e =   0.33505
         Node  =   3.688   1950.0            a =   4.07083 AU
         i     =   8.571                     n =   0.120000
         q     =   2.70690 AU                P =   8.21 years

     1987 ET      R.A. (1950) Decl.     Delta      r       m1
     Oct. 12     1 17.55    +12 31.1    1.713    2.707    17.5
          22     1 10.01    +12 22.2
     Nov.  1     1 03.16    +12 11.1    1.750    2.708    17.5
          11     0 57.85    +12 02.5
          21     0 54.65    +12 00.3    1.888    2.715    17.7
     Dec.  1     0 53.87    +12 07.3
          11     0 55.56    +12 24.9    2.103    2.726    18.0


PERIODIC COMET BORRELLY (1987p)
     Total visual magnitude estimates (L = reflector):  Sept. 28.72
UT, 12.5 (J. Kobayashi, Kumamoto, Japan, 0.31-m L); 30.70, 12.0 (A.
Jones, Stoke, N.Z., 0.32-m L); Oct. 1.38, 11.3 (R. Keen, Mt.
Thorodin, CO, 0.32-m L); 16.34, 10.2 (A. Hale, Las Cruces, NM, 0.41-m
L); 17.47, 9.3 (D. Seargent, The Entrance, N.S.W., 15x80 binoc.).


1987 October 27                (4480)            Daniel W. E. Green

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