[IAUC] IAUC 8815: 2002 GZ_31; C/2006 X3-X10 [25139-2007/05-R1]
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Circular No. 8815
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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2002 GZ_31
K. S. Noll, Space Telescope Science Institute (STScI); W. M.
Grundy, Lowell Observatory; S. D. Kern, STScI; H. F. Levison,
Southwest Research Institute; and D. C. Stephens, Brigham Young
University, report the detection of a binary companion to the
transneptunian object 2002 GZ_31 (cf. MPECs 2002-K12, 2003-M16; MPO
66276). The observations were made during 2006 Apr. 23.352-23.377
UT with the High Resolution Camera of the Advanced Camera for
Surveys on the Hubble Space Telescope, using the clear filters with
one 300-s exposure at each of four dithered positions on the
detector. The two components were separated by an angular distance
of 0".070 +/- 0".009 and differ in brightness by 1.0 magnitude.
The fainter component lies at a position angle of 352 +/- 10 deg
from the primary. The projected separation of the objects in the
sky plane is 2060 +/- 270 km.
COMETS C/2006 X3-X10 (SOHO)
Additional comets have been found on SOHO website images (cf.
IAUC 8813) -- all Kreutz sungrazers except for C/2006 X10 (Meyer
group). K. Battams notes that C/2006 X3, C/2006 X5, C/2006 X6,
C/2006 X8, and C/2006 X9 were all extremely faint (mag about 8.5).
C/2006 X3, which was observed during a solar-particle storm that
hit the SOHO spacecraft, appeared diffuse. C/2006 X4 was stellar
in appearance and reached mag about 6 in C3 images, while C2 images
showed a hint of a very faint tail. C/2006 X5 was very diffuse and
elongated. C/2006 X6 was tiny and slightly diffuse. C/2006 X7 was
stellar in appearance in C3 images, of mag about 6.5, while C2
images showed it as slightly diffuse with a hint of a faint tail.
C/2006 X8 was stellar in appearance. C/2006 X9, which was also
found by R. Kracht, was a very diffuse blob. C/2006 X10 was
stellar in appearance, reaching mag about 7.5.
Comet 2006 UT R.A.(2000)Decl. Inst. F MPEC
C/2006 X3 Dec. 9.567 17 06.8 -24 43 C2 BZ 2007-C40
C/2006 X4 10.513 17 08.9 -26 51 C3/2 TS 2007-C40
C/2006 X5 10.550 17 11.4 -24 49 C2 MM 2007-C40
C/2006 X6 11.675 17 16.4 -24 53 C2 XG 2007-C40
C/2006 X7 11.988 17 17.0 -26 10 C3/2 HS 2007-C41
C/2006 X8 12.567 17 20.9 -24 55 C2 BZ 2007-C41
C/2006 X9 15.204 17 34.6 -25 01 C2 TH 2007-C41
C/2006 X10 15.479 17 30.3 -22 17 C2 RK 2007-C41
(C) Copyright 2007 CBAT
2007 February 28 (8815) Daniel W. E. Green
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