Electronic Telegram No. 3505
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 J1 = P/2007 H1 (McNAUGHT)
     J. V. Scotti, Lunar and Planetary Laboratory, University of Arizona,
reports his recovery of comet P/2007 H1 (cf. IAUCs 8830, 8837) close to the
line-of-variation as a stellar object in poor seeing on images taken with
the Spacewatch 1.8-m f/2.7 reflector at Kitt Peak on May 1; follow-up images
on May 2 in better seeing still show the object as stellar in nine stacked
60-s images.  The astrometry is tabulated below.

     2013 UT             R.A. (2000) Decl.       Mag.   Observer
     May   1.40652   16 05 54.80   - 4 31 33.8   21.1   Scotti
           1.41180   16 05 54.61   - 4 31 32.5   20.2     "
           1.41875   16 05 54.36   - 4 31 30.5   20.4     "
           2.37663   16 05 20.39   - 4 27 50.0   21.0     "
           2.38340   16 05 20.15   - 4 27 48.3   20.9     "
           2.39030   16 05 19.88   - 4 27 46.9   21.3     "

The indicated correction to the prediction by B. G. Marsden on MPC 75733 is
Delta(T) = -0.22 day.  The following linked orbital elements by G. V. Williams
(from 1045 observations spanning 2006 Apr. 25-2013 May 2; mean residual 0".8)
and an ephemeris appear on MPEC 2013-J14.

                    Epoch = 2007 Aug.  8.0 TT
     T = 2007 Aug. 17.64701 TT        Peri. = 202.61067
     e = 0.3780452                    Node  = 144.37700 2000.0
     q = 2.2809910 AU                 Incl. =  11.87424
       a =  3.6674548 AU   n = 0.14033207   P =   7.02 years

                    Epoch = 2014 Sept.20.0 TT
     T = 2014 Sept. 2.49246 TT        Peri. = 202.86087
     e = 0.3767588                    Node  = 144.29445 2000.0
     q = 2.2894678 AU                 Incl. =  11.86350
       a =  3.6734861 AU   n = 0.13998660   P =   7.04 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      superseded by text appearing later in the printed IAU Circulars.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 4                       (CBET 3505)              Daniel W. E. Green