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IAUC 5105: 1990l; SATURN; 1990f

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IAUC number 

                                                  Circular No. 5105
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


COMET MUELLER (1990l)
     E. Bowell, Lowell Obsevatory, provides the following
measurements of prediscovery films exposed by H. E. Holt, H. R. Holt,
C. M. Olmstead, and J. A. Brown with the 0.46-m Schmidt telescope
at Palomar:

     1990 UT             R.A. (1950) Decl.        m1
     Sept.17.41736    1 38 56.91   - 1 46 30.1   17.5
          17.45139    1 38 55.92   - 1 46 45.6
          19.44965    1 38 13.76   - 1 58 34.7   17.5
          19.48385    1 38 12.94   - 1 58 46.0

     Preliminary elliptical orbital elements by Bowell:

     T = 1990 July 26.020 ET          Peri. = 225.255
     e = 0.29913                      Node  = 135.971   1950.0
     q = 2.93334 AU                   Incl. =   9.223
       a =  4.18530 AU     n = 0.115110     P =   8.56 years

     1990 ET      R.A. (1950) Decl.     Delta      r       m1
     Sept.26     1 35.47    - 2 37.8    2.000    2.953    17.2
     Oct.  6     1 30.19    - 3 36.5
          16     1 24.21    - 4 28.4    1.988    2.967    17.2
          26     1 18.28    - 5 08.1
     Nov.  5     1 13.17    - 5 31.8    2.083    2.986    17.3


SATURN
     A. Hale, Las Cruces, NM, communicates that, following an initial
report from S. Wilbur of the appearance of a new white spot on
Saturn on Sept. 25.2 UT, Las Cruces observers have confirmed that
the spot crossed the central meridian at the following estimated
times:  Sept. 28.097 (S. Murrell); 28.104 (Wilbur); 28.107 (C.
Tombaugh).


PERIODIC COMET HONDA-MRKOS-PAJDUSAKOVA (1990f)
     Total visual magnitude estimates:  Sept. 21.39 UT, 8.3 (J. E.
Bortle, Stormville, NY, 20x80 binoculars); 26.49, 8.7 (A. Hale, Las
Cruces, NM, 10x50 binoculars).


1990 September 28              (5105)             Daniel W. E. Green

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