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IAUC 5562: 1992k; 1991a1

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                                                  Circular No. 5562
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 MACHHOLZ (1992k)
     S. Nakano, Sumoto, Japan, communicates the following precise
positions, obtained by T. Seki, Geisei (0.60-m reflector).
The comet is diffuse and condensed, and the image was difficult to
measure on the second film.

     1992 UT             R.A. (2000) Decl.       m1
     July  9.78993    5 16 46.04   +31 32 56.8   10
           9.79549    5 16 47.56   +31 32 42.3
          10.78403    5 21 05.11   +30 48 06.5   10

     Parabolic orbital elements by Nakano from the five available
precise positions, July 5-10:

     T = 1992 July 11.058 TT          Peri. = 163.117
                                      Node  = 235.136   2000.0
     q = 0.82016 AU                   Incl. =  57.747

1992 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
July  7     5 04.30    +33 36.3    1.551    0.824   28.9   36.6      9.1
     12     5 26.27    +29 52.7    1.563    0.820   28.1   35.7      9.1
     17     5 46.78    +25 59.2    1.577    0.828   27.9   35.0      9.2
     22     6 06.04    +21 59.4    1.592    0.846   28.2   34.5      9.3
     27     6 24.23    +17 56.9    1.610    0.874   29.0   34.3      9.4
Aug.  1     6 41.49    +13 54.6    1.630    0.910   30.2   34.1      9.7
      6     6 57.91    + 9 54.9    1.653    0.953   31.7   34.0      9.9
     11     7 13.57    + 5 59.8    1.679    1.003   33.4   33.8     10.1
     16     7 28.54    + 2 10.6    1.708    1.057   35.2   33.6     10.4


COMET SHOEMAKER-LEVY (1991a1)
     D. G. Schleicher, R. G. Ballou and L. A. Alciatore, Lowell
Observatory; D. J. Osip, University of Florida; and C. E. Randall,
University of Colorado, report: "Narrowband-photometry fluxes measured
within a 53"-diameter aperture on July 1 and 2 using the John S. Hall
1.07-m telescope at the Lowell Observatory yield a Haser-model
hydroxyl-production rate given by log Q(OH) = 28.3 and a dust-
production rate given by log (Af rho) = 2.6.  Fluxes for other
observed emission species yield typical cometary abundance ratios.  No
evidence of variability is seen over the two nights."


1992 July 11                   (5562)              Brian G. Marsden

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