[IAUC] IAUC 9198: COMET C/2011 C1 (McNAUGHT); 2011 CQ_1; C/2009 U13, C/2009 U14, C/2009 Y5-Y8 [25139-2011/04-R1]
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Mie Sep 14 16:19:05 ART 2011
Circular No. 9198
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
New postal address: Hoffman Lab 209; Harvard University;
20 Oxford St.; Cambridge, MA 02138; U.S.A.
CBATIAU en EPS.HARVARD.EDU ISSN 0081-0304
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network
COMET C/2011 C1 (McNAUGHT)
Further to IAUC 9197, S. Nakano (Sumoto, Japan) reports that
images obtained by A. Asami and K. Nishiyama with the Bisei
Spaceguard Center's 1.0-m f/3 reflector on Feb. 12.8 UT show a coma
of diameter 16" but no tail. All of the available astrometry, the
following preliminary parabolic orbital elements by G. V. Williams
(from 39 observations, Feb. 10-12), and an ephemeris appear on MPEC
2011-C79.
T = 2011 Apr. 17.953 TT Peri. = 84.440
Node = 192.460 2000.0
q = 0.88341 AU Incl. = 16.831
2011 CQ_1
A fast-moving minor planet discovered by R. A. Kowalski on
Catalina Sky Survey images taken with the 0.68-m Schmidt telescope
on Feb. 4.2 UT (cf. MPEC 2011-C12, 2011-C14) passed about 0.000079
AU from the earth on Feb. 4.82. Having an absolute magnitude of H
approximately 32 (suggesting a diameter of 1-2 m), this is the
closest observed approach of an apparently natural object to the
earth, with the exception of 2008 TC_3, which impacted the earth on
2008 Oct. 6 (cf. IAUCs 8990, 8994).
COMETS C/2009 U13, C/2009 U14, C/2009 Y5-Y8 (SOHO)
Further to IAUCs 9171 and 9186, additional near-sun comets
have been found on SOHO website images -- presumed Kreutz
sungrazers except for C/2009 Y8 (Meyer group), which was stellar in
appearance (peak mag about 7). K. Battams notes that C/2009 U13
was stellar in appearance in C3 images, but slightly diffuse in C2
images. C/2009 U14 was diffuse and quite bright with a tail.
C/2009 Y5, which was found by H. Tan (observer code 'HT'), peaked
near mag about 7.5. C/2009 Y6, was also found by B. Zhou; it was
also stellar in appearance (peak mag about 7.5), as were C/2009 Y7
(peak mag about 7.5-8) and C/2009 Y8 (peak mag about 7).
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 U13 Oct. 29.084 14 05.5 -15 48 C3/2 BZ 2010-L85
C/2009 U14 30.112 13 55.5 -16 36 C3/2 BZ 2010-L85
C/2009 Y5 Dec. 16.729 17 42.5 -24 40 C2 HT 2010-M19
C/2009 Y6 17.079 17 42.6 -25 08 C2 JR 2010-M19
C/2009 Y7 17.579 17 45.2 -25 10 C2 ZX 2010-M19
C/2009 Y8 17.729 17 41.6 -22 35 C2 ZX 2010-M19
(C) Copyright 2011 CBAT
2011 February 12 (9198) Daniel W. E. Green
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