[IAUC] IAUC 9224: P/2010 JC_81; 213P [25139-2012/04-R1]
quai en eps.harvard.edu
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Dom Sep 11 22:21:54 ART 2011
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 en 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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