Electronic Telegram No. 3248
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/2012 S5 = P/1997 C1 (GEHRELS)
     G. V. Williams, Minor Planet Center, has identified observations of
comet P/1997 C1 (cf. IAUCs 6549, 6550, 6562) in incidental astrometry
submitted to the MPC (observations tabulated below); the Sept. 25 CCD
observations were obtained by A. D. Grauer with the Mount Lemmon 1.5-m
reflector, and the Oct. 8 observations were obtained by R. S. McMillan with
the Spacewatch 0.9-m f/3 reflector (+ CCD mosaic).

     2012 UT             R.A. (2000) Decl.       Mag.   Observer
     Sept.25.37706    2 21 47.77   +15 08 44.1   19.2   Grauer
          25.38277    2 21 47.66   +15 08 43.8   19.3     "
          25.39530    2 21 47.44   +15 08 42.5   19.5     "
          25.40104    2 21 47.34   +15 08 41.8   19.2     "
     Oct.  8.25460    2 17 12.80   +14 40 20.6   19.7   McMillan
           8.27226    2 17 12.32   +14 40 17.8   19.7     "
           8.28992    2 17 11.84   +14 40 14.9   19.7     "

The indicated correction to the prediction by B. G. Marsden on MPC 69910 is
Delta(T) = -0.26 day.  The following orbital elements by Williams are from
162 observations spanning 1997 Feb. 1-2012 Oct. 8 (mean residual 0".7).
An ephemeris and revised 1996 orbital elements appear on MPEC 2012-T24.

                    Epoch = 2013 July  7.0 TT
     T = 2013 July  7.99372 TT        Peri. = 210.93931
     e = 0.4749514                    Node  = 225.28500 2000.0
     q = 3.6016592 AU                 Incl. =   2.85500
       a =  6.8596682 AU   n = 0.05485919   P =  17.97 years


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2012 CBAT
2012 October 8                   (CBET 3248)              Daniel W. E. Green