Central Bureau for Astronomical Telegrams

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IAUC 9076: C/2009 S3; 2000 WT_169, 2003 YU_179; 225P

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                                                  Circular No. 9076
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 S3 (LEMMON)
     An apparently asteroidal object discovered in the course of
the Mt. Lemmon survey (discovery observation tabulated below) has
been found to be diffuse on follow-up CCD images taken by W. H.
Ryan and E. V. Ryan on Sept. 26.2 UT with the Magdalena Ridge
Observatory 2.4-m f/8.9 reflector, following posting on the Minor
Planet Center's 'NEOCP' webpage.

     2009 UT             R.A. (2000) Decl.       Mag.
     Sept.24.16207   18 01 23.44   +33 14 06.3   20.9

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2009-S122.

     T = 2011 Dec. 25.349 TT          Peri. = 129.389
                                      Node  = 223.179   2000.0
     q = 6.68049 AU                   Incl. =  59.962


2000 WT_169 AND 2003 YU_179
     K. S. Noll, Space Telescope Science Institute (STScI); W. M.
Grundy, Lowell Observatory; S. D. Benecchi, STScI; and H. A.
Levison, Southwest Research Institute, report the detection of
binary companions to the transneptunian objects 2000 WT_169 (cf.
MPECs 2000-X31, 2002-B11) and 2003 YU_179 (cf. MPEC 2006-H29), from
four dithered observations of each object that were made using the
Hubble Space Telescopes Wide Field Planetary Camera 2 through the
F606W filter starting on 2008 Sept. 24.3825 and 27.3823 UT,
respectively.  For 2000 WT_169, a second component was found at
-0".069 +/- 0".003 in R.A. and -0".050 +/- 0".001 in Decl., which
was fainter than the primary by 0.43 magnitude.  The 2003 YU_179
secondary was found at -0".039 +/- 0".008 in R.A. and -0".054 +/-
0.005 in Decl., being 1.3 magnitudes fainter than the primary.


COMET 225P/2009 Q3 (LINEAR)
Corrigendum.  On IAUC 9068, in the title, the designation should
read 'P/2009 Q3'.

                      (C) Copyright 2009 CBAT
2009 September 27              (9076)            Daniel W. E. Green

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