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IAUC 8929: P/2006 B7

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                                                  Circular No. 8929
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET P/2006 B7 (ODAS)
     G. V. Williams, Minor Planet Center, has rediscovered comet
P/1998 X1 (cf. IAUC 7067) via survey astrometric data, as given
below:

  2006 UT             R.A. (2000) Decl.       Mag.   Observer
  Jan. 30.45486   11 20 27.24   + 5 02 39.4   20.9   Spacewatch
       30.47219   11 20 26.69   + 5 02 42.1   21.4     "
       30.48950   11 20 26.16   + 5 02 45.0   21.4     "
  Feb.  7.44799   11 15 55.54   + 5 29 16.6            "
        7.46534   11 15 54.85   + 5 29 20.3            "
        7.48269   11 15 54.18   + 5 29 24.3            "
       20.29768   11 06 31.75   + 6 24 05.8            "
       20.31493   11 06 30.88   + 6 24 10.6            "
       20.33223   11 06 30.02   + 6 24 15.7            "
       24.23882   11 03 19.60   + 6 42 33.4   20.3     "
       24.25621   11 03 18.72   + 6 42 38.1   21.0     "
       24.27359   11 03 17.86   + 6 42 42.0   20.6     "
  Mar.  2.20153   10 58 23.36   + 7 10 41.9   20.5     "
        2.21886   10 58 22.53   + 7 10 47.2   20.4     "
        2.23613   10 58 21.64   + 7 10 52.0   20.3     "
       23.27711   10 42 40.24   + 8 36 51.9   21.1   Mt. Lemmon
       23.28462   10 42 40.06   + 8 36 53.3   20.5     "
       23.29206   10 42 39.67   + 8 36 54.9   20.5     "
       23.29949   10 42 39.49   + 8 36 56.3   20.3     "
       24.23720   10 42 05.61   + 8 39 53.7   20.4     "
       24.24302   10 42 05.47   + 8 39 54.7   21.2     "
       24.24891   10 42 05.14   + 8 39 55.9   20.6     "
       24.25463   10 42 04.96   + 8 39 57.2   20.1     "

The indicated correction to the orbital elements on MPC 45656 is
Delta(T) approximately -2 days.  The astrometric observations from
the two apparitions do not fit together well, leaving systematic
residuals of up to 5".  The following orbital elements are from 96
observations, 1998-2006 (mean residual 0".69).

                    Epoch = 1998 July  6.0 TT
     T = 1998 July 20.9212 TT         Peri. =  68.9151
     e = 0.448078                     Node  = 358.7172  2000.0
     q = 1.974415 AU                  Incl. =   1.3543
       a =  3.577344 AU    n = 0.1456676    P =   6.77 years

                      (C) Copyright 2008 CBAT
2008 March 31                  (8929)            Daniel W. E. Green

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