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IAUC 4963: 1990a

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                                                  Circular No. 4963
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 WILD 4 (1990a)
     The following precise positions have been reported:

     1990 UT             R.A. (1950) Decl.        m1    Observer
     Jan. 30.82222    9 28 05.31   +21 13 30.2          Wild
          30.88160    9 28 02.24   +21 13 43.8          Trefzger
          30.91736    9 28 00.68   +21 13 52.0          Wild
     Feb.  1.85000    9 26 24.95   +21 21 10.7            "
           4.88264    9 23 49.14   +21 32 18.3            "
           5.84722    9 22 58.60   +21 35 43.1            "
           7.06285    9 21 53.72   +21 39 56.7            "
           9.80174    9 19 27.57   +21 48 59.4   13.2     "

P. Wild and T. Schildknecht (Berne Astronomical Institute, Zimmerwald).
   0.4-m Schmidt.  Measurers U. Hugentobler and P. Wild.
C. Trefzger (Binningen Astronomical Institute, Metzerlen).  0.4-m Schmidt.
   Measurer U. Hugentobler.  Long. = +7d27'.8, Lat. = +47d28'.2, h = 550 m.

     The following orbital elements by P. Wild indicate that e = 0.17,
a = 4.6 AU before a close approach to Jupiter in July 1987:

     T = 1990 July  3.087 ET          Peri. = 170.777
     e = 0.40992                      Node  =  21.415   1950.0
     q = 1.98727 AU                   Incl. =   3.719
       a =  3.36780 AU     n = 0.159472     P =   6.18 years

     1990 ET      R.A. (1950) Decl.     Delta      r       m1
     Feb. 18     9 12.17    +22 11.4    1.270    2.237    13.0
          28     9 04.27    +22 25.9
     Mar. 10     8 58.69    +22 23.7    1.305    2.174    13.0
          20     8 56.25    +22 04.8
          30     8 57.28    +21 30.4    1.411    2.118    13.0
     Apr.  9     9 01.73    +20 42.0
          19     9 09.28    +19 41.0    1.559    2.071    13.1

     Total visual magnitude estimates: Jan. 26.52 UT (A. Pearce,
Coonabarabran, N.S.W., 0.32-m reflector); 27.61, 12.9 (J. Kobayashi,
Kumamoto, Japan, 0.31-m reflector); 28.49, 12.9 (C. S. Morris, Pine
Mountain Club, CA, 0.26-m reflector); 30.53, 13.2 (R. H. McNaught,
Coonabarabran, N.S.W., 0.32-m reflector); 31.21, 12.7 (R. A. Keen,
Mount Thorodin, CO, 0.32-m reflector); 31.55, 13.4 (McNaught).


1990 February 14               (4963)              Gareth V. Williams

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