IAU Central Bureau for Astronomical Telegrams

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IAUC 8783: C/2006 T10, C/2006 U8-U11; C/2006 X1

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IAUC number


                                                  Circular No. 8783
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/2006 T10 AND C/2006 U8-U11 (SOHO)
     Additional apparent comets have been found on SOHO website
images (cf. IAUC 8780), all being Kreutz sungrazers except C/2006
U10 (Meyer group).  K. Battams notes that C/2006 T10 was small and
extremely faint (mag about 8.5).  C/2006 U8 was tiny, stellar, and
faint (mag about 8.0) in C3 images, and extremely faint and diffuse
in C2 images.  C/2006 U9 was small and stellar in appearance (mag
about 7) with big data gaps in C3 images, but slightly diffuse (mag
6.5-7) with a hint of a short tail in C2 images.  C/2006 U10 was
stellar in appearance and very faint, fading out as it neared the
sun.  C/2001 U11 appeared stellar and reached mag about 6.5 in C3
images, while it showed a stubby tail in C2 images.

 Comet        2006 UT       R.A.(2000)Decl.   Inst.  F    MPEC
 C/2006 T10   Oct. 12.538  13 03.0   - 8 15   C2     BZ   2006-X25
 C/2006 U8         16.532  13 14.8   -11 01   C3/2   TS   2006-X25
 C/2006 U9         19.679  13 20.4   -11 47   C3/2   SF   2006-X25
 C/2006 U10        20.104  13 34.6   - 8 45   C2     TH   2006-X26
 C/2006 U11        24.138  13 36.1   -13 37   C3/2   HS   2006-X26


COMET C/2006 X1 (LINEAR)
     An apparently asteroidal object discovered by the LINEAR
survey, and posted on the Minor Planet Center's 'NEOCP' webpage,
has been found to have a coma of diameter 12" surrounding a central
condensation of diameter 5" on CCD images taken on Dec. 11.94-11.99
UT by P. Birtwhistle (Great Shefford, Berkshire, England, 0.40-m
Schmidt-Cassegrain reflector).  A. R. Gibbs reports that four
co-added 120-s unfiltered CCD images taken in poor seeing with the
Mt. Lemmon 1.5-m reflector on Dec. 12.2 show a compact coma and a
narrow 90" tail in p.a. 260 deg.

     2006 UT             R.A. (2000) Decl.       Mag.
     Dec. 11.12465    0 10 06.42   +41 10 59.8   19.2

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2006-X41.

     T = 2007 June 24.183 TT          Peri. = 141.659
                                      Node  = 259.330   2000.0
     q = 6.01297 AU                   Incl. =  40.731

                      (C) Copyright 2006 CBAT
2006 December 12               (8783)            Daniel W. E. Green

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