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IAUC 7076: P/1998 X2

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                                                  Circular No. 7076
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET P/1998 X2 (BOWELL-SKIFF)
     G. V. Williams, Minor Planet Center, has rediscovered comet
P/1983 C1 (= 1983c = 1983 II) in the course of his processing of two-night
"asteroid" data obtained by the LINEAR program on Dec. 14 and 17:

     1998 UT             R.A. (2000) Decl.        m2
     Dec. 14.44735    7 12 59.06   +28 04 19.7   18.8
          14.46919    7 12 58.59   +28 04 19.9   18.8
          14.49110    7 12 57.91   +28 04 20.2   19.5
          14.51294    7 12 57.22   +28 04 24.6   19.5
          17.41385    7 11 36.68   +28 08 41.5   18.5
          17.43657    7 11 35.95   +28 08 43.1   18.5
          17.45923    7 11 35.30   +28 08 44.5   19.0
          17.50490    7 11 33.59   +28 08 48.6   19.3

The indicated correction to the prediction on MPC 27081 (ephemeris on
MPC 32547) is Delta T = +17.3 days.  Williams has computed the following
improved orbital elements satisfying 32 observations 1983-1998 with
mean residual 1".1:

                    Epoch = 1999 May  22.0 TT
     T = 1999 May  14.9027 TT         Peri. = 173.1151
     e = 0.691740                     Node  = 343.4517  2000.0
     q = 1.972033 AU                  Incl. =   3.8367
       a =  6.397311 AU    n = 0.0609127    P =  16.181 years

1998/99     R. A. (2000) Decl.     Delta      r    Elong. Phase      m2
Dec. 23     7 08.46    +28 16.4    1.464    2.427  164.8    6.1     19.2
Jan.  2     7 01.37    +28 26.5    1.393    2.373  173.8    2.6     18.9
     12     6 53.37    +28 29.0    1.349    2.322  168.9    4.7     18.9
     22     6 45.84    +28 21.9    1.330    2.272  158.0    9.3     19.0
Feb.  1     6 40.23    +28 05.1    1.334    2.226  146.9   14.0     19.2
     11     6 37.59    +27 40.5    1.359    2.182  136.3   18.2     19.3
     21     6 38.55    +27 10.1    1.400    2.142  126.6   21.8     19.4
Mar.  3     6 43.27    +26 35.2    1.453    2.105  117.7   24.6     19.6
     13     6 51.56    +25 56.0    1.516    2.072  109.6   26.9     19.7
     23     7 03.05    +25 11.7    1.585    2.044  102.3   28.5     19.8
Apr.  2     7 17.31    +24 20.9    1.658    2.020   95.7   29.5     19.9
     12     7 33.81    +23 21.9    1.735    2.000   89.8   30.1     20.0
     22     7 52.14    +22 13.3    1.815    1.986   84.3   30.2     20.1
May   2     8 11.84    +20 54.1    1.896    1.976   79.4   30.1     20.2

                      (C) Copyright 1998 CBAT
1998 December 28               (7076)              Brian G. Marsden

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