Electronic Telegram No. 3811
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 YG_46 (SPACEWATCH)
     An apparently asteroidal object discovered on CCD mosaic images obtained
by T. H. Bressi with the Spacewatch 0.9-m f/3 reflector at Kitt Peak on 2013
Dec. 27 (discovery observations tabulated below) has been found to show
cometary appearance by CCD astrometrists elsewhere.  The object was posted on
the Minor Planet Center's PCCP webpage after it was given the minor-planet
designation 2013 YG_46 on MPS 493626 (2014 Jan. 5).

     2013 UT             R.A. (2000) Decl.       Mag.   Observer
     Dec. 27.27138    7 37 34.06   +29 39 33.3   19.7   Bressi
          27.28915    7 37 33.33   +29 39 36.2   19.6     "
          27.30692    7 37 32.43   +29 39 38.4   19.5     "

R. E. Hill found a faint nuclear condensation about 2" across and a diffuse
coma 8"-10" across with no obvious tail on four co-added 30-s exposures in
2"-3" seeing with the Mount Lemmon 1.5-m reflector on Jan. 29.3 UT.  A. R.
Gibbs writes that co-added images taken with the Mount Lemmon 1.5-m reflector
on Feb. 19.3 show a coma of diameter about 8"-9".  Just today, H. Sato (Tokyo,
Japan; remotely with a 0.32-m f/8 astrograph of the RAS Observatory near
Nerpio, Spain, on Feb. 2.9) noted the object to be poorly condensed with a
coma 8" in diameter and no obvious tail in five stacked 90-s images.
     The available astrometry, the following elliptical orbital elements by
G. V. Williams, and an ephemeris appear on MPEC 2014-D12.

                    Epoch = 2017 Feb. 16.0 TT
     T = 2017 Jan. 27.8355 TT         Peri. = 242.2060
     e = 0.453360                     Node  =  48.9533  2000.0
     q = 1.790881 AU                  Incl. =   7.8575
       a =  3.276161 AU    n = 0.1662097    P =   5.93 years


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2014 CBAT
2014 February 20                 (CBET 3811)              Daniel W. E. Green