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IAUC 5110: 1990j; P/ENCKE

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IAUC number 

                                                  Circular No. 5110
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


PERIODIC COMET MUELLER 2 (1990j)
     Further observations, extending to Sept. 21, are given on MPC
16937-16938.  Three subsequent observations follow:

     1990 UT             R.A. (1950) Decl.        m1    Observer
     Sept.26.70556    0 40 07.29   +11 27 48.5   16     Seki
          27.33618    0 39 49.20   +11 23 17.9          Balam
          30.68715    0 38 09.15   +10 58 34.4   16.5   Seki

T. Seki (Geisei).  Communicated by S. Nakano.
D. Balam and J. Tatum (Victoria).

     The following improved orbital elements, from 30 observations (some
of the earlier ones having been corrected) Sept. 15-30, confirm that
the comet is a short-period one.  Comet 1987 XXXI = 1987a1 receives the
name P/Mueller 1 and comet 1990l the name P/Mueller 3.

     T = 1990 Nov.  8.779 ET          Peri. = 166.292
     e = 0.39820                      Node  = 218.679   1950.0
     q = 2.07775 AU                   Incl. =   6.888
       a =  3.45253 AU     n = 0.153637     P =   6.42 years

     1990 ET      R.A. (1950) Decl.     Delta      r       m1
     Sept.26     0 40.46    +11 32.8    1.115    2.104    16.5
     Oct.  1     0 38.00    +10 56.2
           6     0 35.43    +10 16.1    1.096    2.093    16.4
          11     0 32.91    + 9 33.6
          16     0 30.57    + 8 50.1    1.101    2.085    16.4
          21     0 28.57    + 8 07.1
          26     0 27.04    + 7 26.1    1.128    2.080    16.4
          31     0 26.08    + 6 48.4
     Nov.  5     0 25.76    + 6 14.8    1.178    2.078    16.5
          10     0 26.11    + 5 46.2
          15     0 27.17    + 5 23.0    1.246    2.078    16.7


PERIODIC COMET ENCKE
     Total visual magnitude estimates by J. E. Bortle, Stormville,
NY (20x80 binoculars):  Sept. 25.38 UT, 8.8; 28.38, 8.7;
Oct. 1.39, 8.6.


1990 October 2                 (5110)             Daniel W. E. Green

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