Electronic Telegram No. 3115
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/2008 R1 (GARRADD)
     H. Hsieh reports astrometry of this comet (cf. IAUCs 8969, 8980) as
measured by M. Micheli and himself from CCD images obtained on two nights in
2011 with the 10-m Keck I telescope and the 8.1-m Gemini North telescope at
Mauna Kea by E. Schunova, C. Trujillo, A. Matulonis, A. Nitta, L. Fuhrman, and
himself and on two nights in 2012 by Hsieh with the 4.1-m SOAR reflector at
Cerro Pachon.  No remarks were provided on the object's appearance.  The comet
has astrometry from just before aphelion and now also post-aphelion.

     2011 UT             R.A. (2000) Decl.       Mag.   Observer
     Feb.  3.53655   10 12 25.69   +34 16 57.0          Hsieh
           3.54497   10 12 25.22   +34 17 00.0            "
           5.43998   10 10 41.87   +34 28 07.9            "
           5.44747   10 10 41.42   +34 28 10.5            "

     2012 UT             R.A. (2000) Decl.       Mag.   Observer
     Apr. 14.15385   14 03 07.05   - 0 44 58.7   23.4   Hsieh
          14.16094   14 03 06.60   - 0 44 58.3   23.7     "
          15.51290   14 01 41.51   - 0 43 32.4            "
          15.51675   14 01 41.24   - 0 43 32.1            "
          15.52833   14 01 40.51   - 0 43 31.4            "

The following orbital elements by G. V. Williams are from 38 observations
spanning 2008 July 15-2012 Apr. 15 (mean residual 0".73).  An ephemeris
appears on MPEC 2012-K41.

                    Epoch = 2013 Jan. 28.0 TT
     T = 2013 Jan. 25.43382 TT        Peri. = 256.55895
     e = 0.3409705                    Node  =  51.96117 2000.0
     q = 1.7976845 AU                 Incl. =  15.89883
       a =  2.7277753 AU   n = 0.21877172   P =   4.50 years


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2012 CBAT
2012 May 22                      (CBET 3115)              Daniel W. E. Green