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IAUC 8642: C/2005 X1; V445 Pup; C/2005 W2

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IAUC number

                                                  Circular No. 8642
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     Edward C. Beshore has discovered a diffuse comet with slight
central condensation (diameter about 15"; possible broad, faint
tail about 5" long in p.a. about 300 deg) on Catalina Sky Survey
images (0.68-m Schmidt telescope; discovery observation tabulated
below).  Following posting on the 'NEO Confirmation Page', S.
Gajdos and J. Vilagi confirm the diffuse nature of the object (coma
diameter about 8") on CCD images taken on Dec. 9.1 UT with the
0.6-m f/5.5 reflector at Modra; G. Hug (Eskridge, Kansas, 0.7-m
reflector) writes that his images taken on Dec. 9.4 also show the
object to be diffuse.

     2005 UT             R.A. (2000) Decl.       Mag.
     Dec.  7.41028   10 13 15.52   +38 35 32.9   19.6

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2005-X51.

     T = 2005 Sept.30.861 TT          Peri. = 142.571
                                      Node  = 301.419   2000.0
     q = 3.27707 AU                   Incl. =  96.463

     D. K. Lynch, R. J. Rudy, C. C. Venturini, and S. Mazuk,
Aerospace Corporation; R. C. Puetter, University of California at
San Diego; R. B. Perry, Langley Research Center, NASA; and B. Walp,
Lick Observatory, report 1.0- to 2.5-micron spectroscopy of V445
Pup (cf. IAUC 7559, 7580) with the Lick 3.0-m telescope (+ VNIRIS)
at Nov. 16.535 UT.  The object has faded and the thermal dust
emission (Lynch et al. 2004, A.J. 128, 2962) has virtually
disappeared.  No visible counterpart has appeared, so it is likely
that the dust has cooled significantly.  Structured He I emission
at 1.0830 microns remains strong.

     Improved elliptical orbital elements from MPEC 2005-X23:

     T = 2006 Mar. 28.0034 TT         Peri. = 111.8212
     e = 0.825331                     Node  = 336.5983  2000.0
     q = 3.330897 AU                  Incl. =  11.2651
       a = 19.069727 AU    n = 0.0118355    P =  83.28 years

                      (C) Copyright 2005 CBAT
2005 December 9                (8642)            Daniel W. E. Green

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