Central Bureau for Astronomical Telegrams
IAUC 8672: C/2005 W16, W17, X2-X9, Y3-Y6
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Circular No. 8672
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/2005 W16, W17, X2-X9, Y3-Y6 (SOHO)
Additional Kreutz sungrazing comets have been found on SOHO
website images (cf. IAUC 8657). According to K. Battams, C/2005
W16 and C/2005 X5 were small and stellar in appearance in C3 images,
the former reaching mag 7.3 at 10.1 solar radii on Nov. 28.471 UT,
and the latter reaching mag 6.4 at 9.3 solar radii on Dec. 8.846;
in C2 images, C/2005 W16 showed a faint, thin tail that reached a
length of about 9' on Nov. 28.854 at 5.7 solar radii, while C/2005
X5 was fairly diffuse with a very faint tail that reached a length
of about 6' on Dec. 9.083 at 6.7 solar radii. C/2005 W17, C/2005
X2, and C/2005 X6 were tiny and too faint for photometry; C/2005
W17 was diffuse and the latter two were stellar in appearance.
C/2005 X3 was small and diffuse, reaching mag 7.7 at 6.5 solar
radii on Dec. 4.600. C/2005 X4 was small, faint, and diffuse,
reaching mag about 8. C/2005 X7 was tiny and stellar in appearance,
yet persistent (despite reaching mag about 8), curiously surviving
as long as did C/2005 X5. C/2005 X8 and C/2005 Y5 were extremely
faint -- the former described as tiny, and the latter as small and
diffuse; C/2005 Y6 was a near-identical twin to C/2005 Y5, but
marginally brighter. C/2005 X9 was small and diffuse, reaching mag
7.7 at 7.3 solar radii on Dec. 12.917. C/2005 Y3 was small and a
little too diffuse for good photometry in C3 images; in C2 images,
it was also diffuse, reaching mag 6.6 at 7.4 solar radii on Dec.
20.379. C/2005 Y4 was very faint and diffuse.
Comet 2005 UT R.A.(2000)Decl. Inst. F MPEC
C/2005 W16 Nov. 28.113 16 09.4 -25 06 C3/2 RM 2006-C59
C/2005 W17 29.704 16 23.1 -23 19 C2 HS 2006-C59
C/2005 X2 Dec. 3.442 16 40.5 -23 55 C2 HS 2006-C59
C/2005 X3 4.583 16 45.6 -24 09 C2 HS 2006-C59
C/2005 X4 6.567 16 54.5 -24 21 C2 KC 2006-C60
C/2005 X5 8.321 16 59.0 -26 59 C3/2 JR 2006-C60
C/2005 X6 8.392 17 03.0 -24 37 C2 JR 2006-C60
C/2005 X7 9.075 17 07.9 -24 46 C2 HS 2006-C60
C/2005 X8 11.908 17 19.5 -24 58 C2 QY 2006-C61
C/2005 X9 12.908 17 23.9 -25 03 C2 RM 2006-C61
C/2005 Y3 19.988 17 57.4 -26 25 C3/2 QY 2006-C61
C/2005 Y4 20.938 18 01.5 -25 11 C2 SH 2006-C61
C/2005 Y5 22.354 18 07.5 -25 13 C2 KB 2006-C61
C/2005 Y6 22.454 18 07.9 -25 10 C2 KB 2006-C61
(C) Copyright 2006 CBAT
2006 February 13 (8672) Daniel W. E. Green
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