Electronic Telegram No. 3247
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 R2 = P/1996 A1 (JEDICKE)
     [Editor's note:  the text below replaces that on CBET 3246 (Sept. 25
observational information).]
     Artyom Novichonok and Otabek Burhonov report their recovery of comet
P/1996 A1 (cf. IAUCs 6287, 6288, 6292) on four 420-s CCD images obtained on
Sept. 11 with a 1.5-m f/8 Ritchey-Chretien reflector at the Majdanak
observatory in Uzbekistan; the comet showed a small coma of diameter 5".
G. V. Williams subsequently identified observations obtained on Sept. 25
by T. H. Bressi with the Spacewatch 0.9-m reflector.

     2012 UT             R.A. (2000) Decl.       Mag.   Observer
     Sept.11.86458    1 47 52.32   +16 52 09.1          Burhonov
          11.86948    1 47 52.24   +16 52 08.7   20.9     "
          11.87436    1 47 52.18   +16 52 08.4            "
          11.88010    1 47 52.09   +16 52 08.0            "
          25.42333    1 43 38.68   +16 31 35.3   20.7   Bressi
          25.44102    1 43 38.30   +16 31 32.9   21.3     "
          25.45871    1 43 37.94   +16 31 30.9   21.3     "

The indicated correction to the prediction by G. V. Williams on MPC 75374 is
Delta(T) = -0.74 day; the indicated correction to the prediction by S. Nakano
in the 2011/2012 Comet Handbook (p. H13) is -0.70 day.  The following linked
orbital elements by Williams are from 326 observations spanning 1993 Oct. 12
to 2012 Sept. 25 (mean residual 0".6; cf. MPEC 2012-T07):

                    Epoch = 2014 Oct. 30.0 TT
     T = 2014 Nov. 14.61087 TT        Peri. = 223.36989
     e = 0.4431333                    Node  = 248.71637 2000.0
     q = 4.0793199 AU                 Incl. =   6.60224
       a =  7.3254870 AU   n = 0.04971064   P =  19.83 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      superseded by text appearing later in the printed IAU Circulars.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 3                   (CBET 3247)              Daniel W. E. Green