Electronic Telegram No. 3404
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 C1 = P/2004 H2 (LARSEN)
     J. V. Scotti, Lunar and Planetary Laboratory, University of Arizona,
reports his recovery of comet P/2004 H2 (cf. IAUC 8328) on CCD images obtained
with the Spacewatch 1.8-m telescope (astrometry tabulated below).  On the Feb.
5 images, he measured a coma diameter of 8" and a faint tail extending 0'.13
in p.a. 288 degrees; on Feb. 6, clouds interfered with detailed measurements,
but the comet appeared diffuse.

     2013 UT             R.A. (2000) Decl.       Mag.   Observer
     Feb.  5.50083   11 52 05.63   +10 04 52.5   19.4   Scotti
           5.51911   11 52 05.43   +10 04 58.9   19.4     "
           5.53715   11 52 05.23   +10 05 05.2   19.5     "
           6.41451   11 51 56.11   +10 10 18.4            "
           6.43355   11 51 55.87   +10 10 25.3   19.4     "
           6.46045   11 51 55.54   +10 10 34.8            "

The indicated correction to the prediction by S. Nakano in the ICQ 2012 Comet
Handbook is Delta(T) = -0.58 day.  The following linked orbital elements by
G. V. Williams (from 67 observations spanning 2004 Apr. 19-2013 Feb. 6; mean
residual 0".6) and an ephemeris appear on MPEC 2013-C25.

                    Epoch = 2013 Dec. 14.0 TT
     T = 2013 Dec. 11.03943 TT        Peri. = 104.59786
     e = 0.4174992                    Node  = 131.50849 2000.0
     q = 2.6359616 AU                 Incl. =  11.77240
       a =  4.5252494 AU   n = 0.10238593   P =   9.63 years


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 February 6                  (CBET 3404)              Daniel W. E. Green