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IAUC 5622: 1992p; 1992 QB1

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                                                  Circular No. 5622
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)


PERIODIC COMET BREWINGTON (1992p)
     Further precise positions have been reported as follows:

     1992 UT             R.A. (2000) Decl.        m1    Observer
     Sept. 1.50469    7 24 42.63   +36 44 37.3          Tatum
           1.79861    7 25 30.41   +36 43 54.8   14     Otomo
           2.47274    7 27 19.22   +36 42 08.1          Tatum
           4.79601    7 33 30.24   +36 35 51.6   14     Seki
           4.81181    7 33 32.70   +36 35 49.5            "
          25.74271    8 23 31.70   +35 17 16.4   16       "
          25.75035    8 23 32.56   +35 17 14.4            "
          26.77535    8 25 42.95   +35 12 50.6   16.5     "
          26.78056    8 25 43.71   +35 12 50.1            "

J. B. Tatum (University of Victoria).  0.25-m Schmidt.
S. Otomo (Otomo, Japan).  0.25-m f/3.4 Schmidt.
T. Seki (Geisei).  0.60-m f/3.5 reflector.

     On communicating the late-September observations, S. Nakano,
Sumoto, Japan, remarks that the comet is evidently of short period.
The following improved orbital elements have been determined by the
undersigned from 18 observations Aug. 28-Sept. 26:

     T = 1992 June 4.050 TT           Peri. =  45.223
     e = 0.62962                      Node  = 342.919   2000.0
     q = 1.56038 AU                   Incl. =  18.096
       a =  4.21290 AU     n = 0.113981     P =   8.65 years

1992 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Sept.25     8 21.93    +35 20.5    2.185    1.963   63.9   27.3     16.6
Oct.  5     8 42.17    +34 37.5    2.150    2.024   69.2   27.5     16.7
     15     8 59.83    +33 56.3    2.109    2.087   75.0   27.5     16.8
     25     9 14.81    +33 20.6    2.062    2.151   81.4   27.2     16.9
Nov.  4     9 26.95    +32 53.6    2.010    2.217   88.4   26.6     17.0
     14     9 36.07    +32 37.5    1.955    2.283   96.1   25.5     17.0


1992 QB1
     Further observations by D. Jewitt at Mauna Kea on Sept. 25 confirm
the validity of the ephemeris on IAUC 5611.  The orbit is still very
indeterminate, but retrograde solutions can probably be precluded.


1992 September 27              (5622)              Brian G. Marsden

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