[IAUC] IAUC 9222: C/2011 O1; NEW Sats OF JUPITER: S/2010 J 1, S/2010 J 2 [25139-2012/04-R1]

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                                                  Circular No. 9222
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
New postal address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
CBATIAU en EPS.HARVARD.EDU           ISSN 0081-0304
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Prepared using the Tamkin Foundation Computer Network


COMET C/2011 O1 (LINEAR)
     As first announced on CBET 2775, an apparently asteroidal
object discovered by the LINEAR 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.  L. Buzzi (Varese, Italy, 0.38-m reflector) writes that
stacked images taken on July 31.9 UT show the object to be diffuse
with a coma of size 8"-9" that is elongated in p.a. about 45 deg.
H. Sato (Tokyo, Japan; remotely using a 0.51-m reflector near
Mayhill, NM, U.S.A.) reports a condensed coma of diameter 10" of
total red mag 16.5 in a 4".9 circular aperture on Aug. 1.2.  R. H.
McNaught (Siding Spring, 0.5-m Uppsala Schmidt telescope) notes
that the comet is in a dense star field but shows a coma of
diameter about 12" (magnitude 16.9) on Aug. 1.5.

     2011 UT             R.A. (2000) Decl.       Mag.   Observer
     July 31.16245   17 18 31.78   -16 51 10.3   17.6   LINEAR

The available astrometry appears on MPC 75578; the following
orbital elements by G. V. Williams are from 68 observations (July
31-Sept. 4):

                    Epoch = 2012 Aug. 21.0 TT
     T = 2012 Aug. 18.4732 TT         Peri. = 232.3214
     e = 0.995150                     Node  =  89.8151  2000.0
     q = 3.893964 AU                  Incl. =  76.5141


NEW SATELLITES OF JUPITER:  S/2010 J 1 AND S/2010 J 2
     As first announced on CBET 2734, Brett Gladman, University of
British Columbia, reports the discovery of two new satellites of
Jupiter in irregular orbits.  S/2010 J 1 was discovered at the
Palomar 5-m Hale telescope on 2010 Sept. 7 UT by R. Jacobson, M.
Brozovic, B. Gladman, and M. Alexandersen with additional
observations from the 3.5-m Canada-France-Hawaii Telescope (CFHT)
made by C. Veillet during 2010 Sept. 8-2011 Jan. 4.  S/2010 J 2 was
discovered by C. Veillet at the CFHT on 2010 Sept. 8 UT.  The
Palomar team later 'pre-covered' S/2010 J 2 in data from one night
earlier that had been acquired as part of the Palomar observations.
C. Veillet then provided follow-up observations on 2010 Oct. 2, 9,
and 30 as well as on Nov. 1.  Both objects are in retrograde orbits,
S/2010 J1 having P = 724.34 days (absolute magnitude H = 16.6) and
S/2010 J2 having P = 588.82 days (H = 17.5).  Orbital elements by
G. V. Williams with full astrometry were published on MPEC 2011-L06.

                      (C) Copyright 2011 CBAT
2011 September 10              (9222)            Daniel W. E. Green