Electronic Telegram No. 3558
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 CU_129 (PANSTARRS)
     An apparently asteroidal object discovered on images taken on Feb. 13
with the 1.8-m Pan-STARRS1 telescope on Haleakala (discovery positions
tabulated below, along with prediscovery observations from Feb. 1) -- and
designated 2013 CU_129 when announced on MPEC 2013-D15 -- has been found by
Peter Veres, Richard Wainscoat, Henry Hsieh, and Marco Micheli to show
cometary appearance in four w-band images obtained with the Pan-STARRS
telescope on June 2 UT, in which the object displays a short 4" tail in p.a.
about 90 deg.  Micheli and Wainscoat obtained a set of follow-up r-band
images with the Canada-France-Hawaii Telescope on Mauna Kea (queue observer
Peter Forshay) on June 5.28, which show a clear 40" tail in p.a. about 100
deg.

     2013 UT             R.A. (2000) Decl.       Mag.
     Feb.  1.43671    9 13 48.00   +37 01 24.7   19.8
           1.44881    9 13 46.79   +37 01 31.4   20.0
           1.46190    9 13 45.46   +37 01 38.7   20.8
          13.32055    8 53 00.98   +38 32 19.5   21.0
          13.33328    8 52 59.58   +38 32 24.2   21.0
          13.34612    8 52 58.13   +38 32 28.7   20.7
          13.35836    8 52 56.76   +38 32 33.1   20.4

The available astrometry, the following elliptical orbital elements by G. V.
Williams, and an ephemeris appear on MPEC 2013-L64.

                    Epoch = 2013 Aug. 16.0 TT
     T = 2013 Aug.  6.93249 TT        Peri. = 211.97225
     e = 0.7221138                    Node  =  46.20967 2000.0
     q = 0.8001483 AU                 Incl. =  12.14771
       a =  2.8794094 AU   n = 0.20171999   P =   4.89 years


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 June 13                     (CBET 3558)              Daniel W. E. Green