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IAUC 9136: C/2010 G3; C/2010 H1

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IAUC number 

                                                  Circular No. 9136
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.
CBAT@IAU.ORG; CBATIAU@EPS.HARVARD.EDU
URL http://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304


COMET C/2010 G3 (WISE)
     A. Mainzer, Jet Propulsion Laboratory, reports the discovery
by the WISE satellite of a comet candidate (discovery position
below), about as bright as C/2010 D1 (IAUC 9118) at 12 microns and
having about twice the 12-micron signal-to-noise ratio at 22
microns, making it easily the brightest WISE discovery in the
latter band.  The coma was 25" in diameter at 12 microns and about
40" in diameter with a 20" tail at 22 microns (the tail being not
so readily visible at 12 microns).  W. H. Ryan, observing with the
2.4-m reflector at Magdalena Ridge on Apr. 16.3 UT, puts the comet
at magnitude R = 18.4-18.6 and remarks on a distinct coma and a
tail in p.a. 170 deg.

     2010 UT             R.A. (2000) Decl.       Observer
     Apr. 14.13821   18 48 36.28   +47 28 03.3   WISE

Further astrometry, the following very preliminary parabolic
orbital elements by B. G. Marsden, and an ephemeris are given on
MPEC 2010-H04.

     T = 2010 Sept.26.597 TT          Peri. =  98.838
                                      Node  = 316.408   2000.0
     q = 4.66346 AU                   Incl. = 109.045


COMET C/2010 H1 (GARRADD)
     As first announced on CBET 2248, G. J. Garradd reported his
discovery of a probable comet (discovery position tabulated below)
in the course of the Siding Spring Survey with the 0.5-m Uppsala
Schmidt telescope; there was a faint tail extending 10" to the
north.  After posting on the 'NEOCP' webpage, A. C. Gilmore and P.
M. Kilmartin (Mt. John Observatory 1.0-m f/7.7 reflector) reported
a short, bright tail in p.a. 355 deg from their images taken on
Apr. 17.4 UT.

     2010 UT             R.A. (2000) Decl.       Mag.   Observer
     Apr. 16.64819   11 46 34.50   -31 19 23.4   18.6   Garradd

Further astrometry was published initially on MPEC 2010-H07, and
the following parabolic orbital elements by B. G. Marsden and an
ephemeris appear on MPEC 2010-H35.

     T = 2010 July  4.167 TT          Peri. = 240.634
                                      Node  = 346.068   2000.0
     q = 2.63536 AU                   Incl. =  35.018

                      (C) Copyright 2010 CBAT
2010 April 23                  (9136)            Daniel W. E. Green

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