IAU Electronic Telegram No. 4474

Central Bureau for Astronomical Telegrams
Mailing address: Hoffman Lab 209; Harvard University;
20 Oxford St.; Cambridge, MA 02138; U.S.A.
e-mail: cbatiau@eps.harvard.edu (alternate cbat@iau.org)
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Prepared using the Tamkin Foundation Computer Network

COMET P/2018 A2 = P/2013 CU_129 (PANSTARRS)
     Erwin Schwab, Egelsbach, Germany, reports the recovery of comet P/2013
CU_129 (cf. CBET 3558) on images that he obtained remotely on Jan. 16.9 UT
with the 0.8-m f/3 Schmidt reflector at Calar Alto, Spain (with measurement
assistance by M. Micheli and D. Koschny).  No coma and no tail was visible
on frames with a total exposure time of 600 s.  After receiving Schwab's
report, G. V. Williams identified incidental astrometry of the comet from
observations made at Mount Lemmon by D. C. Fuls on Jan. 12.4.  The astrometry
is tabulated below.

     2018 UT             R.A. (2000) Decl.       Mag.   Observer
     Jan. 12.38036   10 49 12.78   +28 21 48.7   20.6   Fuls
          12.38549   10 49 12.71   +28 21 52.0   20.9     "
          12.39062   10 49 12.69   +28 21 55.4   20.8     "
          12.39575   10 49 12.66   +28 21 59.1   20.8     "
          16.91575   10 48 32.27   +29 12 27.0   20.0   Schwab
          16.92524   10 48 32.11   +29 12 33.9   20.3     "
          16.93379   10 48 31.98   +29 12 39.9   20.5     "

The indicated correction to the prediction by S. Nakano in the ICQ's 2018
Comet Handbook is Delta(T) = +0.02 day.  The following linked orbital elements
by Williams (from 159 observations spanning 2013 Feb. 1-2018 Jan. 16) and an
ephemeris appear on MPEC 2018-B14.

                    Epoch = 2018 June 11.0 TT
     T = 2018 June 24.36592 TT        Peri. = 211.92761
     e = 0.7227338                    Node  =  46.22841 2000.0
     q = 0.7978532 AU                 Incl. =  12.15537
       a =  2.8775711 AU   n = 0.20191333   P =   4.88 years


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2018 CBAT
2018 January 17                  (CBET 4474)              Daniel W. E. Green