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IAUC 8900: P/2007 W2

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                                                  Circular No. 8900
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/2007 W2 (LINEAR)
     L. Buzzi and F. Luppi report their recovery of P/2000 B3 (cf.
IAUC 7356) on CCD frames taken with a 0.60-m f/4.64 reflector at
Varese, Italy (astrometry tabulated below); stacked images
totalling 25 min of exposure show a 8" condensed coma with a tail
approximately 10" long in p.a. 240 deg.

     2007 UT             R.A. (2000) Decl.       Mag.
     Nov. 17.06763    5 52 34.70   +43 16 00.7
          17.12336    5 52 35.06   +43 16 32.4   19.5
          26.98525    5 52 05.65   +44 43 56.4
          27.03909    5 52 04.65   +44 44 23.3   18.6

The indicated correction to the prediction on MPC 54167 is Delta(T)
= +0.16 day.  The following orbital elements are by B. G. Marsden
from 91 observations, 2000-2007 (mean residual 0".5):

                    Epoch = 2000 Feb. 26.0 TT
     T = 2000 Feb. 14.1600 TT         Peri. = 130.5069
     e = 0.575215                     Node  = 352.1471  2000.0
     q = 1.700254 AU                  Incl. =  11.1263
       a =  4.002627 AU    n = 0.1230797    P =   8.008 years

                    Epoch = 2008 Feb. 24.0 TT
     T = 2008 Feb. 26.1914 TT         Peri. = 130.6410
     e = 0.574210                     Node  = 352.0642  2000.0
     q = 1.708753 AU                  Incl. =  11.1181
       a =  4.013132 AU    n = 0.1225967    P =   8.039 years

     This ephemeris uses H_10 = 15.5:

2007/8      R. A. (2000) Decl.   Delta     r    Elong. Phase   Mag.
Nov. 26     5 52.31   +44 35.8   1.026   1.932  147.5   15.9   18.4
Dec.  6     5 48.39   +45 49.0   0.956   1.890  153.5   13.4   18.2
     16     5 41.43   +46 33.7   0.906   1.851  156.6   12.2   18.0
     26     5 33.38   +46 40.5   0.876   1.816  155.2   13.1   17.8
Jan.  5     5 26.66   +46 06.7   0.865   1.785  149.9   16.0   17.7
     15     5 23.57   +44 57.4   0.873   1.759  142.8   19.8   17.7
     25     5 25.50   +43 23.2   0.896   1.739  135.2   23.5   17.7
Feb.  4     5 32.66   +41 34.1   0.933   1.723  127.8   26.9   17.7
     14     5 44.62   +39 37.2   0.982   1.713  120.9   29.6   17.8

                      (C) Copyright 2007 CBAT
2007 November 27               (8900)            Daniel W. E. Green

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