[IAUC] IAUC 9227: C/2011 N3; P/2011 NO_1 [25139-2012/04-R1]

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                                                  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
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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