[IAUC] IAUC 9220: COMET C/2011 N2 (McNAUGHT); C/2009 Y18, C/2009 Y19; C/2010 A6 [25139-2011/04-R1]

Mie Sep 14 16:18:46 ART 2011

                                                  Circular No. 9220
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
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Prepared using the Tamkin Foundation Computer Network


COMET C/2011 N2 (McNAUGHT)
     R. H. McNaught reports his discovery of a comet on CCD images
obtained with the 0.5-m Uppsala Schmidt telescope at Siding Spring
(discovery observation tabulated below); the object shows a 10"
circular coma with moderate condensation.  After posting on the
Minor Planet Center's 'NEOCP' webpage, cometary appearance has also
been reported by N. Howes, G. Sostero, and E. Guido, who remotely
used the 2.0-m f/10 "Faulkes Telescope South" at Haleakala on July
5.4 UT to obtained 20-s Bessel-R-filtered exposures that show a
diffuse coma at least 5" in diameter, possibly elongated north-south.

     2011 UT             R.A. (2000) Decl.       Mag.   Observer
     July  4.45870   14 02 06.24   -39 29 08.5   17.9   McNaught

     The available astrometry, the following preliminary parabolic
orbital elements by G. V. Williams, and an ephemeris appear on
MPEC 2011-N31.

     T = 2011 Oct.  9.796 TT          Peri. = 353.292
                                      Node  = 272.274   2000.0
     q = 2.69626 AU                   Incl. =  34.895


COMETS C/2009 Y18 AND C/2009 Y19 (SOHO)
     Further to IAUC 9200, two additional near-sun comets have been
found on SOHO website images.  C/2009 Y18, a member of the Meyer
group, was stellar in appearance (peak mag about 6.5-7).  K.
Battams notes that C/2009 Y19 (a Kreutz sungrazer) was very faint
(peak mag about 7.5-8).

 Comet        2009 UT       R.A.(2000)Decl.  Inst.  F    MPEC
 C/2009 Y18   Dec. 31.746   18 49.9  -23 33   C2    JR   2010-O32
 C/2009 Y19        31.863   18 53.2  -25 28   C3    JR   2010-O32


COMET C/2010 A6 (SOHO)
     A Kreutz sungrazer (discovery observation tabulated below)
found on SOHO website images was extremely faint (peak mag about
8.5-9) and diffuse in C2 images from Jan. 3; in STEREO HI-1A images
from Jan. 2, it appeared faint and slightly elongated (mag about
11-12).

 Comet        2010 UT       R.A.(2000)Decl.   Inst.  F    MPEC
 C/2010 A6    Jan.  3.064   19 00.3  -23 56   C2/HI  JR  2010-Q35

                      (C) Copyright 2011 CBAT
2011 July 7                    (9220)            Daniel W. E. Green