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IAUC 8455: C/2004 V6-V12; C/2004 V13

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IAUC number 

                                                  Circular No. 8455
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://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMETS C/2004 V6-V12 (SOHO)
     Additional SOHO comets (continuation to IAUC 8451):

 Comet        2004 UT      R.A.(2000)Decl.   Inst.  F    MPEC
 C/2004 V6    Nov.  4.113  14 29.5  -17 16   C2     TH   2004-X72
 C/2004 V7          4.146  14 33.8  -16 43   C3/2   TH   2004-X72
 C/2004 V8          7.696  14 39.3  -19 12   C3/2   KB   2004-X72
 C/2004 V9          7.754  14 55.8  -18 32   C2/3   HO   2004-X73
 C/2004 V10         8.129  14 49.7  -16 43   C2     KB   2004-X73
 C/2004 V11         8.746  14 53.3  -18 12   C2     TH   2004-X74
 C/2004 V12        10.029  14 40.6  -21 18   C3/2   XL   2004-X74


COMET C/2004 V13 (SWAN)
     On Nov. 30, M. Mattiazzo (Adelaide, S. Australia) reported
that he noticed images of a faint object moving on SWAN images (his
positions below have uncertainties of a degree or more due to the
poor resolution of the ultraviolet imager on SWAN/SOHO),
speculating then that, if real, the object might become visible in
the days ahead in the C3 coronagraph.  Today, S. Hoenig has
reported the appearance of a comet with a tail in C3 images, which
K. Battams reports has brightened slightly from mag about 6.5 on
Dec. 16.26 UT to about 6.1 on Dec. 16.70-16.74.  While only the
first SOHO position by Battams is given below (reduced by B. G.
Marsden), a span of 14 hours of SOHO astrometry appears on MPEC
2004-Y02.

     2004 UT           R.A. (2000) Decl.       Observer
     Nov.  9          12 48      -19.5         SWAN
          16          13 15      -20.5           "
          21          13 41      -21.0           "
          25          14 08      -21.5           "
     Dec. 16.154      17 04.9    -19 54        SOHO

It does appear that the SWAN object is identical with the SOHO
object, and the following very preliminary parabolic orbital
elements by Marsden also appear on MPEC 2004-Y02.

     T = 2004 Dec. 21.139 TT          Peri. =  94.253
                                      Node  = 207.015   2000.0
     q = 0.17727 AU                   Incl. =  34.463

                      (C) Copyright 2004 CBAT
2004 December 16               (8455)            Daniel W. E. Green

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