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IAUC 9200: COMET C/2011 C3 (GIBBS); C/2009 Y9-Y14; C/2009 Y15

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IAUC number 

                                                  Circular No. 9200
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@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 C3 (GIBBS)
     A. R. Gibbs reports his discovery of another comet on CCD
images taken with the Mt. Lemmon 1.5-m reflector (discovery
observation tabulated below); his initial four co-added 30-s
exposures show a compact coma of size 3" x 3".5 with a faint,
tapered, 6" tail in p.a. 290 deg.

     2011 UT             R.A. (2000) Decl.       Mag.   Observer
     Feb. 12.50235   15 21 25.16   - 7 48 06.5   19.8   Gibbs

The available astrometry, the following preliminary parabolic
orbital elements by G. V. Williams, and an ephemeris appear on MPEC
2011-D01.

     T = 2011 Apr.  8.505 TT          Peri. = 207.657
                                      Node  =  20.878   2000.0
     q = 1.51088 AU                   Incl. =  49.636


COMETS C/2009 Y9-Y14 (SOHO)
     Further to IAUC 9198, additional near-sun comets have been
found on SOHO website images -- presumed Kreutz sungrazers except
for C/2009 Y10 (Kracht group), which was stellar in appearance
(peak mag about 7).  K. Battams notes that C/2009 Y9 was very small
(peak mag about 8).  C/2009 Y11 peaked near mag 7.5-8.  C/2009 Y12
was slightly diffuse (peak mag about 6.5-7).  C/2009 Y13 was
diffuse with a tail (peak mag about 6.5).  C/2009 Y14 was slightly
diffuse with a short tail (peak mag about 6.5).

 Comet        2009 UT       R.A.(2000)Decl.   Inst.  F    MPEC
 C/2009 Y9    Dec. 22.814   18 09.8  -24 51   C2    BZ   2010-M19
 C/2009 Y10        20.381   17 48.3  -22 45   C2    RK   2010-O30
 C/2009 Y11        25.221   18 21.6  -25 33   C3/2  MU   2010-O30
 C/2009 Y12        26.071   18 26.7  -26 15   C3/2  BZ   2010-O30
 C/2009 Y13        26.263   18 30.8  -28 37   C3/2  BZ   2010-O30
 C/2009 Y14        28.431   18 41.8  -27 46   C3/2  BZ   2010-O30


COMET C/2009 Y15 (STEREO)
     Further to IAUC 9151, a faint, slightly diffuse Kreutz
sungrazer was found on STEREO HI1-A website images (peak mag about
11-12).

 Comet        2009 UT       R.A.(2000)Decl.   Inst.  F    MPEC
 C/2009 Y15   Dec. 29.933   23 15.7  - 7 41   HI-1   AW   2010-O31

                      (C) Copyright 2011 CBAT
2011 February 15               (9200)            Daniel W. E. Green

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