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IAUC 9224: P/2010 JC_81; 213P

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IAUC number 

                                                  Circular No. 9224
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@EPS.HARVARD.EDU           ISSN 0081-0304
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


COMET P/2010 JC_81 (WISE)
     As first announced on CBET 2780, an asteroidal object that was
discovered with the WISE satellite (reported on MPS 326646 with a
two-day arc; discovery observation tabulated below; MPEC 2010-V52
issued on 2010 Nov. 5 when additional observations were found in
November) has been found to show cometary appearance by other CCD
astrometrists.  G. V. Borisov, Crimean Laboratory, Sternberg
Astronomical Institute, reports that 90-s unfiltered CCD images
taken with the 20-cm astrograph at the Crimean Observatory at
Nauchny on Aug. 1.01 UT show a faint 0'.2 coma of mag 14.7 and 0'.6
tail toward p.a. about 45 deg; additional frames taken with the
Crimean 60-cm Cassegrain telescope and the 2.6-m Shajn telescope
confirmed the object's cometary appearance on Aug. 2, showing a
condensed coma of diameter 20" with magnitude V = 15.1.
Observations by Borisov on Aug. 4.0 with the 20-cm astrograph show
a condensed coma of diameter 12" has with magnitude V = 14.8.  V.
Rumyantsev, Crimean Astrophysical Observatory, writes that images
taken with the 2.6-m Shajn reflector on Aug. 3.0 show a coma
diameter of 20" and magnitude 15.4.  A previously unconfirmed
report of diffuseness with a 10" coma (red mag 18.0-18.2) from 2010
Nov. 5 was made by L. Buzzi, P. Concari, S. Foglia, G. Galli, and
M. Tombelli from CCD images taken with a 0.18-m Newtonian reflector
located at the Tzec Maun Observatory near Moorook, Australia.

     2010 UT             R.A. (2000) Decl.       Observer
     May  10.62033   22 45 02.67   -52 16 29.2   WISE

The early astrometry appears on MPC 75579; the following orbital
elements by G. V. Williams are from 101 observations (2010 May 10-
2011 Sept. 8):

                    Epoch = 2011 Apr. 29.0 TT
     T = 2011 Apr. 26.5624 TT         Peri. =  12.5727
     e = 0.777575                     Node  =  30.7680  2000.0
     q = 1.810723 AU                  Incl. =  38.6900
       a =  8.140841 AU    n = 0.0424327    P =  23.23 years


COMET 213P/VAN NESS
     As noted on CBET 2798, this comet has apparently split, with a
second component B of mag 19-20 being located some 5' to the
southwest of component A in July and early August.

                      (C) Copyright 2011 CBAT
2011 September 11              (9224)            Daniel W. E. Green

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