Central Bureau for Astronomical Telegrams

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IAUC 8811: (123509) 2000 WK_183; C/2006 V2-V10

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                                                  Circular No. 8811
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)


(123509) 2000 WK_183
     K. S. Noll, Space Telescope Science Institute (STScI); D. C.
Stephens, Brigham Young University; W. M. Grundy, Lowell
Observatory; H. F. Levison, Southwest Research Institute; and S. D.
Kern, STScI, report the detection of a binary companion to the
transneptunian object (123509) in observations made during 2005
Nov. 24.365-24.395 UT with the High Resolution Camera of the
Advanced Camera for Surveys on the  Hubble Space Telescope (HST),
using the clear filters with one 300-s exposure at each of four
dithered positions on the detector.  The two components are clearly
resolved in each image and in the coadded image; they were
separated by an angular distance of 0".080 +/- 0".004 and differ in
brightness by 0.40 magnitude.  The fainter component lies at a
position angle of 138.9 +/- 5.5 deg from the primary.  The
projected separation of the objects in the sky plane is 2470 +/- 60
km.  The HST corrected for parallax and tracked both components of
(123509) as they moved together at an average rate of 0".50/min.


COMETS C/2006 V2-V10 (SOHO)
     Additional Kreutz sungrazing comets have been found on SOHO
website images (cf. IAUC 8807).  C/2006 V2 was very bright, peaking
at mag 1.3 on Nov. 3.154 UT at 11.0 solar radii in C3 images, with
a thin tail that was 1.25 deg long at 8.0 solar radii on Nov. 3.429;
in C2 images, the long, thin tail survived for some hours after the
comet's head had disappeared behind the occulter.  C/2006 V3 and V4
were stellar in appearance and faint (mag 7.5).  C/2006 V5, V6, V7,
V8, and V10 were somewhat diffuse and faint (mag about 8, 7.5, 7,
7.5, and 8, respectively).  C/2006 V9 was stellar in appearance and
of mag about 5 in C3 images; in C2 images, it had a condensed head
and an extremely faint, thin tail that extended to about 17' on Nov.
14.171 at 5 solar radii.

 Comet       2006 UT       R.A.(2000)Decl.   Inst.  F    MPEC
 C/2006 V2   Nov. 2.013   14 00.6   -18 18   C3/2   JS   2007-B38
 C/2006 V3        3.021   14 27.2   -16 13   C2     HS   2007-B38
 C/2006 V4        4.013   14 25.3   -17 28   C3     HS   2007-B38
 C/2006 V5        7.379   14 46.0   -17 44   C2     HS   2007-B38
 C/2006 V6        7.521   14 46.1   -17 43   C2     TH   2007-B38
 C/2006 V7        8.579   14 50.6   -18 02   C2     HS   2007-B38
 C/2006 V8       11.851   15 04.7   -19 07   C2     RK   2007-B75
 C/2006 V9       13.321   14 59.3   -21 16   C3/2   BZ   2007-B75
 C/2006 V10      13.993   15 13.4   -19 40   C2     HS   2007-B75

                      (C) Copyright 2007 CBAT
2007 February 21               (8811)            Daniel W. E. Green

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