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IAUC 9115: COMET P/2010 B2 (WISE); C/2009 P4, C/2009 P5, C/2009 Q6, C/2009 Q7

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                                                  Circular No. 9115
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  D. W. E. Green, Room 209; Department of
 Earth and Planetary Sciences; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
CBATIAU@EPS.HARVARD.EDU
URL http://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304


COMET P/2010 B2 (WISE)
     A. Mainzer, Jet Propulsion Laboratory, reports that an object
discovered by the new earth-orbiting satellite WISE appears
extended with a hazy coma of diameter about 10"-20" and a tail
about 15" long toward the west-northwest in all the WISE infrared
images (discovery observation tabulated below).  Following posting
on the Minor Planet Center's 'NEOCP' webpage, D. J. Tholen
(Institute for Astronomy, University of Hawaii) writes that three
stacked 20-s Megacam r-band images taken at Mauna Kea with the
3.6-m Canada-France-Hawaii Telescope (average seeing about 1".45)
by A. Draginda in morning twilight on Feb. 7.66 UT show that the
object is clearly non-stellar in all three images, but with no
obvious tail.  J. V. Scotti (Lunar and Planetary Laboratory,
University of Arizona) reports that images taken on Feb. 8.47 with
the Spacewatch 1.8-m f/2.7 reflector at Kitt Peak show the object
to be diffuse with a coma diameter of 8" (magnitude V = 20.2), with
a possible westward tail involved with a field star.

     2010 UT             R.A. (2000) Decl.       Observer
     Jan. 22.63762   14 01 10.72   -11 10 02.3   WISE

The available astrometry, the following elliptical orbital elements,
residuals, and an ephemeris appear on MPEC 2010-C23.

                    Epoch = 2010 Jan.  4.0 TT
     T = 2009 Dec. 20.8910 TT         Peri. = 155.4007
     e = 0.463138                     Node  =   0.6617  2000.0
     q = 1.606972 AU                  Incl. =   8.8897
       a =  2.993271 AU    n = 0.1903203    P =   5.18 years


COMETS C/2009 P4, C/2009 P5, C/2009 Q6, C/2009 Q7 (SOHO)
     Further to IAUCs 9112, 9113, and 9114, additional Kreutz
sungrazers have been found on SOHO website images.  All were small
and stellar in appearance except for C/2009 P5 (slightly elongated,
with peak mag about 6.5).  C/2009 P4 and C/2009 Q6 peaked near mag
7, whereas C/2009 Q7 (which was also found by M. Kusiak) peaked
near mag about 7-7.5.

 Comet       2009 UT       R.A.(2000)Decl.   Inst.  F    MPEC
 C/2009 P4   Aug.  9.971    9 03.1  +14 20   C3     BZ   2009-W09
 C/2009 P5        11.071    8 59.4  +13 21   C3     BZ   2009-W09
 C/2009 Q6        20.904    9 41.8  +11 11   C3     ZX   2009-W10
 C/2009 Q7        22.763    9 51.5  +10 49   C3     ZX   2009-W10

                      (C) Copyright 2010 CBAT
2010 February 8                (9115)            Daniel W. E. Green

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