Electronic Telegram No. 3510
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


COMET P/2013 J2 (McNAUGHT)
     R. H. McNaught reports his discovery of a comet on CCD images taken with
the 0.5-m Uppsala Schmidt telescope at Siding Spring (discovery observations
tabulated below).  On May 8, there was a very weak 15" tail in p.a. 250 deg,
while on May 9 there was an obvious 20" tail in p.a. 240 deg; the comet's
FWHM in the images on both nights was slightly large than those of surrounding
field stars.

     2013 UT             R.A. (2000) Decl.       Mag.   Observer
     May   8.75012   21 00 15.27   -17 43 35.9   18.2   McNaught
           8.75970   21 00 15.99   -17 43 29.4   18.2     "
           8.76867   21 00 16.65   -17 43 23.4   18.1     "
           8.77767   21 00 17.26   -17 43 17.5   17.6     "
           9.74673   21 01 29.70   -17 32 10.8            "
           9.75629   21 01 30.39   -17 32 04.3   17.7     "
           9.76596   21 01 31.09   -17 31 57.8   17.8     "
           9.77564   21 01 31.79   -17 31 51.1   17.6     "

The available astrometry, the following very preliminary elliptical orbital
elements by G. V. Williams, and an ephemeris appear on MPEC 2013-J38.

     T = 2013 Aug. 26.9872 TT         Peri. =  39.4115
     e = 0.503148                     Node  = 288.3733  2000.0
     q = 2.086849 AU                  Incl. =  15.1360
       a =  4.200145 AU    n = 0.1145006    P =   8.61 years


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 May 10                      (CBET 3510)              Daniel W. E. Green