[IAUC] IAUC 9157: P/2010 N1; C/2010 E6; P/2010 J5 [25139-2011/04-R1]

[quai en cfa.harvard.edu]

                                                  Circular No. 9157
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  D. W. E. Green, Room 209; Department of
 Earth and Planetary Sciences; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
CBAT en IAU.ORG; CBATIAU en EPS.HARVARD.EDU
URL http://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304


COMET P/2010 N1 (WISE)
     Amy Mainzer, Jet Propulsion Laboratory, reports the discovery
of a comet (discovery observation tabulated below) with a bright
nuclear condensation of diameter about 30" and a tail about 60"
long toward the southeast in WISE spacecraft images; at 12 microns,
the nuclear condensation appears to be about twice as bright as
P/2009 WJ_50 (cf. IAUC 9117) was on Feb. 6 (which was presumably
around mag 20-22 from ground-based CCD imaging in Feb.).  After
posting on the Minor Planet Center's 'NEOCP' webpage, D. Tholen
(University of Hawaii) reports that a stack of six 20-s exposures
made by queue observer J. Luthe with the 3.6-m Canada-France-Hawaii
Telescope on July 10.3 UT shows a tail extending at least 10"
(maybe as much as 15") from an asymmetric head (mag 19.4-19.7) in
p.a. 110-115 deg.

     2010 UT             R.A. (2000) Decl.       Observer
     July  5.47876   13 32 07.62   + 6 26 19.2   WISE

The available astrometry (including pre-discovery observations at
Catalina back to Apr. 13), the following preliminary elliptical
orbital elements, and an ephemeris appear on MPEC 2010-N48.

                    Epoch = 2010 Sept. 1.0 TT
     T = 2010 Aug. 16.1532 TT         Peri. = 153.4966
     e = 0.533831                     Node  = 113.2100  2000.0
     q = 1.494519 AU                  Incl. =  12.8765
       a =  3.205958 AU    n = 0.1716988    P =   5.740 years


COMET C/2010 E6 (STEREO)
     Further to IAUC 9151, K. Battams (Naval Research Laboratory)
adds that this was one of the brightest comets seen in coronagraph
spacecraft data, peaking around magnitude 1 near Mar. 12.625 UT.


COMET P/2010 J5 (McNAUGHT)
     This comet (cf. IAUC 9148) has been shown to be of short
period; below are orbital elements from MPEC 2010-N30:

                    Epoch = 2009 Nov. 25.0 TT
     T = 2009 Nov.  6.4523 TT         Peri. = 150.3572
     e = 0.087808                     Node  =  65.6664  2000.0
     q = 3.748744 AU                  Incl. =   7.3540
       a =  4.109601 AU    n = 0.1183054    P =   8.33 years

                      (C) Copyright 2010 CBAT
2010 July 10                   (9157)            Daniel W. E. Green