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IAUC 5495: 1992g; 1992f

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IAUC number 

                                                  Circular No. 5495
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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


COMET MUELLER (1992g)
     Jean Mueller, Palomar Observatory, reports her discovery of a
probable comet on a 90-min IIIa-J exposure on Apr. 9 by C. Brewer and
herself (the same plate on which SN 1992S was found) for PSSII.  The
image is softer than (but also fainter than) those of some minor
planets found on the plate, with a possible hint of a tail to the
west.  The image on the 30-min exposure on Apr. 11 is too weak to
confirm whether the object is cometary or not.

     1992 UT             R.A. (2000) Decl.        m1
     Apr.  9.34583   14 13 06.61   +27 51 03.7
           9.40833   14 13 04.99   +27 51 36.0   17.5
          11.39514   14 12 05.31   +28 11 16.3
          11.41597   14 12 04.90   +28 11 23.7


PERIODIC COMET SHOEMAKER-LEVY 8 (1992f)
     Further precise positions have been reported as follows:

     1992 UT             R.A. (2000) Decl.        m1    Observer
     Mar. 30.71911   15 14 14.14   -17 24 32.6          Savage
     Apr. 11.75951   15 11 06.93   -16 41 12.7    16    Seki
          11.77344   15 11 06.58   -16 41 09.2            "

A. Savage (Siding Spring).  1.2-m U.K. Schmidt.  Prediscovery image.
   Measurer R. H. McNaught.  Tail extending 30" to northwest.
T. Seki (Geisei).  Communicated by S. Nakano.

     Elliptical orbital elements by Nakano from the eight observations:

     T = 1992 May 21.033 TT           Peri. =  16.555
     e = 0.29487                      Node  = 213.363   2000.0
     q = 2.72425 AU                   Incl. =   6.022
       a =  3.86345 AU     n = 0.129790     P =   7.59 years

1992 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Apr.  8    15 12.43    -16 56.3    1.833    2.735  148.2   11.1     16.7
     18    15 08.36    -16 13.3    1.769    2.731  159.1    7.5     16.6
     28    15 02.76    -15 23.1    1.730    2.727  170.3    3.6     16.5
May   8    14 56.38    -14 29.7    1.717    2.725  177.1    1.1     16.5
     18    14 50.14    -13 38.4    1.730    2.724  166.6    5.0     16.5


1992 April 13                  (5495)              Brian G. Marsden

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