[IAUC] IAUC 9227: C/2011 N3; P/2011 NO_1 [25139-2012/04-R1]
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Lun Sep 12 21:09:31 ART 2011
Circular No. 9227
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 C/2011 N3 (SOHO)
K. Battams, Naval Research Laboratory, provided astrometric
measures of a fairly bright Kreutz sungrazing comet (peak magnitude
about 1) that formed a long tail and that was found by Masanori
Uchina in LASCO C3 images ("discovery" observation tabulated below)
and observed also by both STEREO satellites and in extreme-
ultraviolet Solar Dynamics Observatory images. The reduced
astrometry and orbital elements by G. V. Williams appeared on MPEC
2011-N41.
2011 UT R.A. (2000) Decl. Observer
July 4.24592 6 37 24.3 +18 46 43 SOHO
COMET P/2011 NO_1 (ELENIN)
As first announced on CBET 2768, Leonid Elenin (Lyubertsy,
Russia) reported the discovery of an object with slight apparent
cometary appearance on four 240-s unfiltered CCD exposures taken
remotely by Elenin and Igor Molotov (Moscow, Russia) with a 0.45-m
f/2.8 astrograph at the ISON-NM observatory near Mayhill, NM, USA,
on July 7.3 UT (discovery observation tabulated below). After
posting on the Minor Planet Center's NEOCP webpage, several other
CCD astrometrists also commented on the object's cometary
appearance; for example, S. Foglia found that eight stacked 60-s
images taken by P. Miller, P. Roche, A. Tripp, R. Holmes, R. Miles,
L. Buzzi, and himself with the 2.0-m f/10 "Faulkes Telescope North"
at Haleakala (and measured by Buzzi and Foglia) on July 13.6 show a
diffuse coma of size 4" x 7", elongated in p.a. 244 deg.
2011 UT R.A. (2000) Decl. Mag. Observer
July 7.30144 20 22 49.05 -19 39 34.9 19.5 Elenin
This object was announced by T. Spahr as a minor planet on MPEC
2011-O09 while a CBET was being prepared to announce it as a comet,
and he assigned the designation 2011 NO_1 to it. The available
astrometry was published on MPC 75580; the following elliptical
orbital elements by G. V. Williams are from 55 observations (July
7-29):
Epoch = 2011 Feb. 8.0 TT
T = 2011 Jan. 20.5343 TT Peri. = 263.6372
e = 0.775195 Node = 296.0948 2000.0
q = 1.243920 AU Incl. = 15.2514
a = 5.533342 AU n = 0.0757221 P = 13.02 years
(C) Copyright 2011 CBAT
2011 September 12 (9227) Daniel W. E. Green
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