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IAUC 5855: 1992 QB1

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                                                  Circular No. 5855
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)


1992 QB1
     The following precise positions have been reported:

     1993 UT             R.A. (2000) Decl.         R    Observer
     June 25.37850    0 08 36.94   + 0 59 54.7   23.9   Marconi
          26.42452    0 08 37.65   + 0 59 59.0   23.5     "
     July 14.422      0 08 34.68   + 0 59 52.2            "
          15.429      0 08 33.69   + 0 59 46.3            "
          15.55616    0 08 33.62   + 0 59 45.8          Jewitt
          15.59765    0 08 33.58   + 0 59 45.5            "
          16.416      0 08 32.63   + 0 59 40.1          Marconi

G. Marconi and O. Hainaut (European Southern Observatory).  3.6-m New
   Technology Telescope (June) and 1.5-m Danish telescope (July) + CCD.
   Measurer Hainaut.  July times uncertain by several minutes.
D. Jewitt and J. Luu (Mauna Kea).  2.2-m reflector + CCD.

     The following improved orbital elements represent 29 of the 30
available observations with mean residual 0".5.  The critical 1992
Dec. 25 observation (IAUC 5684) leaves a residual of 2".2 in R.A. in
relation to the others.   Further observations will be particularly
desirable in Jan. 1994, when the object has resumed its direct motion.

                    Epoch = 1993 Aug.  1.0 TT
     T = 2022 July  6.5261 TT         Peri. =  44.0135
     e = 0.087611                     Node  = 359.4129  2000.0
     q = 39.989399 AU                 Incl. =   2.2128
       a = 43.829347 AU    n = 0.00339670    P = 290.2 years

1993/94     R. A. (2000) Decl.     Delta      r    Elong. Phase      V
Oct. 10     0 03.48    + 0 27.7   39.875   40.837  164.2    0.4     23.6
     20     0 02.78    + 0 23.2   39.937   40.835  154.1    0.6     23.7
     30     0 02.15    + 0 19.2   40.027   40.834  144.0    0.8     23.7
Nov.  9     0 01.62    + 0 15.8   40.140   40.832  133.8    1.0     23.7
     19     0 01.20    + 0 13.2   40.275   40.831  123.6    1.2     23.7
     29     0 00.92    + 0 11.5   40.427   40.829  113.4    1.3     23.8
Dec.  9     0 00.79    + 0 10.7   40.591   40.828  103.2    1.3     23.8
     19     0 00.81    + 0 10.9   40.761   40.826   93.1    1.4     23.8
     29     0 00.98    + 0 12.1   40.934   40.825   82.9    1.4     23.8
Jan.  8     0 01.31    + 0 14.3   41.102   40.823   72.8    1.3     23.8
     18     0 01.78    + 0 17.4   41.262   40.821   62.8    1.2     23.8


1993 September 4               (5855)              Brian G. Marsden

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