[IAUC] IAUC 9057: C/2009 A8-A10, C/2009 O1; C/2009 O2 [25139-2009/08-R1]

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                                                  Circular No. 9057
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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COMETS C/2009 A8-A10 AND C/2009 O1 (STEREO)
     Further to IAUC 9054, additional Kreutz sungrazers have been
found on STEREO spacecraft images (CO = COR2-A and COR2-B).  K.
Battams, Naval Research Laboratory, notes that the three January
comets were all small, faint, and slightly diffuse (mag around
11-12).  C/2009 O1, which may have been around mag 6 or 6.5,
appeared as a somewhat-long thin streak with no discernable head or
coma in COR2-A images; in COR2-B images, the comet appeared much
more condensed (possibly slightly diffuse and with a hint of a
barely detectable tail).

 Comet        2009 UT       R.A.(2000)Decl.   Inst.  F    MPEC
 C/2009 A8    Jan.  4.544   22 19.2  -13 58   H1A    AW   2009-O25
 C/2009 A9         10.600   22 44.7  -11 41   H1A    RM   2009-O25
 C/2009 A10        10.794   22 43.2  -11 26   H1A    AW   2009-O25
 C/2009 O1    July 18.870   11 12.2  + 2 32   CO     MK   2009-O25


COMET C/2009 O2 (CATALINA)
     An apparently asteroidal comet discovered in the course of the
Catalina Sky Survey (discovery observation tabulated below), and
posted on the Minor Planet Center's 'NEOCP' webpage, has been found
by other CCD astrometrists to show cometary appearance.  J. V.
Scotti, Lunar and Planetary Laboratory, writes that images taken on
July 30.2 UT with the Kitt Peak 1.8-m f/2.7 reflector shows the
object to be slightly diffuse with an 8" coma and a faint tail
0'.35 long in p.a. 155 deg.  W. H. Ryan reports that his images
from July 30.35-30.37 with the 2.4-m f/8.9 reflector at Magdalena
Ridge Observatory show a coma and a very faint tail in p.a. about
135 deg.

     2009 UT             R.A. (2000) Decl.       Mag.
     July 27.29859   20 44 36.52   -11 30 35.0   19.5

The available astrometry, the following preliminary parabolic
orbital elements by B. G. Marsden, and an ephemeris appear on MPEC
2009-O53.

     T = 2010 Mar. 24.656 TT          Peri. = 133.010
                                      Node  = 310.266   2000.0
     q = 0.70282 AU                   Incl. = 108.284

                      (C) Copyright 2009 CBAT
2009 July 30                   (9057)            Daniel W. E. Green