IAU Electronic Telegram No. 4429

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)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network

COMET P/2017 S1 = P/2010 P4 (WISE)
     E. Schwab, Egelsbach, Germany, reports his recovery of comet P/2010 P4
(cf. IAUC 9161) on CCD images taken on Sept. 20.1 UT by D. Abreu with a 1.0-m
f/4.4 reflector at the European Space Agency's Optical Ground Station at
Tenerife (with measurement assistance by M. Micheli, D. Koschny, A. Knoefel,
and M. Busch); the comet showed no coma and no visible tail on a frame with a
total exposure time of 600 s.  Schwab obtained follow-up images on Sept. 20.9
with an 0.8-m f/3 Schmidt telescope at Calar Alto.  The astrometry is
tabulated below:

     2017 UT             R.A. (2000) Decl.       Mag.   Observer
     Sept.20.09698    1 24 16.78   +17 13 22.9   19.4   Abreu
          20.10452    1 24 16.27   +17 13 32.0   19.4     "
          20.11206    1 24 15.75   +17 13 40.7   19.4     "
          20.87979    1 23 25.78   +17 28 49.0   19.4   Schwab
          20.88518    1 23 25.42   +17 28 55.5   19.5     "

The indicated correction to the prediction by G. V. Williams on MPC 89017 is
Delta(T) = +0.15 day; the indicated correction to the prediction by S. Nakano
in the ICQ's 2017 Comet Handbook is Delta(T) = +0.08 day.
     The following linked orbital elements by Williams (from 62 observations
spanning 2010-2017; mean residual 0".5) and a new ephemeris appear on MPEC
2017-S90.

                    Epoch = 2017 Sept. 4.0 TT
     T = 2017 Aug. 18.42953 TT        Peri. = 354.15605
     e = 0.4978751                    Node  =   2.23395 2000.0
     q = 1.8607475 AU                 Incl. =  24.07886
       a =  3.7057460 AU   n = 0.13816263   P =   7.13 years


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2017 CBAT
2017 September 20                (CBET 4429)              Daniel W. E. Green