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IAUC 5198: 1991f

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IAUC number 

                                                  Circular No. 5198
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 SHOEMAKER-LEVY 4 (1991f)
     The following additional positions have been reported:

     1991 UT             R.A. (1950) Decl.        m1    Observer
     Feb. 14.46372   12 07 41.15   + 3 03 46.3   17.0   Helin
          16.28935   12 06 56.05   + 3 16 40.0          McCrosky
          16.33456   12 06 55.18   + 3 16 59.3            "
          25.76720   12 01 59.17   + 4 29 25.2          McNaught

E. Helin, K. Lawrence, and P. Rose (Palomar).  0.46-m Schmidt
  telescope.
R. E. McCrosky, C.-Y. Shao, and O. C. Dahl (Oak Ridge).  1.5-m
  reflector + CCD.
R. H. McNaught (Siding Spring).  Uppsala Southern Schmidt telescope.

     Orbital elements by B. G. Marsden, Center for Astrophysics,
from 7 observations Feb. 9-25:

     T = 1990 July 19.492 ET          Peri. = 302.746
     e = 0.44452                      Node  = 151.304   1950.0
     q = 1.99809 AU                   Incl. =   8.433
       a =  3.59706 AU     n = 0.144472     P =   6.82 years

     1991 ET      R.A. (1950) Decl.     Delta      r       m1
     Feb. 23    12 03.61    + 4 07.3    1.677    2.602    17.3
          28    12 00.60    + 4 47.5
     Mar.  5    11 57.24    + 5 28.6    1.674    2.646    17.3
          10    11 53.65    + 6 09.8
          15    11 49.94    + 6 49.9    1.698    2.690    17.4
          20    11 46.25    + 7 28.0
          25    11 42.69    + 8 03.2    1.751    2.734    17.6
          30    11 39.37    + 8 34.8
     Apr.  4    11 36.39    + 9 02.2    1.830    2.779    17.8
           9    11 33.81    + 9 25.2
          14    11 31.69    + 9 43.5    1.935    2.824    17.9
          19    11 30.08    + 9 57.0
          24    11 29.00    +10 05.9    2.061    2.869    18.1
          29    11 28.45    +10 10.3
     May   4    11 28.42    +10 10.5    2.205    2.914    18.4


1991 February 26               (5198)             Daniel W. E. Green

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