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IAUC 9037: COMET C/2009 G1 (STEREO); COMET C/2009 F6 (YI-SWAN); C/2003 Q1, Q6; C/2008 X6; C/2008 Y10, Y11 (SOHO)

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IAUC number 

                                                  Circular No. 9037
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://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET C/2009 G1 (STEREO)
     K. Kadota (Ageo, Japan) has reported astrometry on Apr. 9.8 UT
with a 25-cm reflector, which shows that the prediction on IAUC
9036 was off by about 4'.  He found the comet to have total mag
10.6, a coma diameter of 4'.5, and strong central condensation; his
astrometry and the following revised orbital elements appear on
MPEC 2009-G32:

     T = 2009 Apr. 15.093 TT          Peri. = 173.823
                                      Node  = 120.657   2000.0
     q = 1.12993 AU                   Incl. = 108.091


COMET C/2009 F6 (YI-SWAN)
     S. Korotskiy, Moscow, reports that he found a prediscovery
image of this comet (cf. IAUCs 9034, 9035) on an exposure (limiting
mag about 13) taken with a Canon EOS 20D digital camera (+ 50-mm
f/4 lens) at the Kazan State University observatory at Karachay-
Cherkessia, as given below:

     2009 UT             R.A. (2000) Decl.       Mag.
     Mar. 25.06024   22 28 28.8    +48 45 14     10.7


COMETS C/2003 Q1, Q6; C/2008 X6; C/2008 Y10, Y11 (SOHO)
     Further to IAUC 9036, additional near-sun presumed comets have
been found on SOHO website images (with the initial observations
tabulated below).  C/2008 Y10, a Kreutz sungrazer, was stellar in
appearance (mag about 6) in C3 images; in C2 images, it was
teardrop-shaped and slightly diffuse.  C/2008 Y11, a member of the
Marsden group, was tiny and stellar in appearance (mag about 7).
R. Kracht proposed that C/2008 Y11 may be identical with C/2003 Q6
(cf. IAUC 8339), and C/2008 X6 (cf. IAUC 9030) with C/2003 Q1 (cf.
IAUC 8339); linkages by B. G. Marsden (cf. MPEC 2009-F81) suggest
that these two comets (both with P approximately 5.3 yr) may have
separated from each other around their last return to perihelion
(1998 Apr. 26-29), though Kracht was unable to find any trace of
them in C2 data from 1998 Apr. 25.

 Comet        2008 UT       R.A.(2000)Decl.   Inst.  F    MPEC
 C/2008 Y10   Dec. 21.988   18 09.0  -27 29   C3/2   JR   2009-F17
 C/2008 Y11        22.288   17 59.0  -22 54   C2     RK   2009-F17

                      (C) Copyright 2009 CBAT
2009 April 10                  (9037)            Daniel W. E. Green

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