IAU Electronic Telegram No. 4455

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 W1 = P/2011 VJ_5 (LEMMON)
     Erwin Schwab, Egelsbach, Germany, reports the recovery of P/2011 VJ_5
(cf. CBET 3010) on CCD images obtained by Pablo Ruiz with a 1.0-m f/4.4
reflector at the European Space Agency's Optical Ground Station (Tenerife,
Spain) with measuring assistance by M. Micheli, D. Koschny, A. Knoefel, and
M. Busch.  Schwab obtained confirming images of the comet the following
night remotely with the 0.8-m f/3 Schmidt reflector at Calar Alto, Spain.
On both nights, the comet showed no coma, and no tail was visible on frames
with a total exposure time of 600 s.  The astrometry is provided below, along
with observations identified by G. V. Williams from routine survey astrometry
submitted to the Minor Planet Center (including images taken by A. D. Grauer
with the Mt. Lemmon 1.5-m reflector and also images obtained with the 1.8-m
Pan-STARRS1 telescope at Haleakala).

     2017 UT             R.A. (2000) Decl.       Mag.   Observer
     Oct. 27.42133    3 58 57.82   +14 16 03.9   21.9   Pan-STARRS1
          27.43300    3 58 57.56   +14 16 00.8   21.7     "
          27.44473    3 58 57.27   +14 15 57.1   21.9     "
          27.45640    3 58 57.02   +14 15 54.1   22.1     "
     Nov. 16.29982    3 46 41.75   +12 27 57.1   21.3   Grauer
          16.30499    3 46 41.46   +12 27 55.1   20.9     "
          16.31018    3 46 41.18   +12 27 53.8   21.3     "
          16.31541    3 46 40.88   +12 27 51.8   20.3     "
          18.34737    3 44 56.23   +12 16 22.0   20.8   Pan-STARRS1
          18.35905    3 44 55.58   +12 16 18.2   21.0     "
          18.37076    3 44 54.93   +12 16 14.4   21.0     "
          19.12644    3 44 14.55   +12 11 57.9   20.3   Ruiz
          19.13624    3 44 14.01   +12 11 54.7   20.2     "
          19.14605    3 44 13.48   +12 11 51.5   20.6     "
          19.81367    3 43 38.67   +12 08 05.9   20.4   Schwab
          19.82317    3 43 38.15   +12 08 02.7   20.2     "
          19.83266    3 43 37.64   +12 07 59.7   20.3     "

The indicated correction to the prediction on MPC 94678 is Delta(T) = +0.82
day.  The indicated correction to the prediction by S. Nakano in the ICQ's
2017 Comet Handbook is Delta(T) = +1.04 day.

                    Epoch = 2018 Mar. 23.0 TT
     T = 2018 Mar. 22.92426 TT        Peri. = 315.28158
     e = 0.5570640                    Node  = 169.91712 2000.0
     q = 1.5078679 AU                 Incl. =   3.97540
       a =  3.4042567 AU   n = 0.15691723   P =   6.28 years


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

                         (C) Copyright 2017 CBAT
2017 November 20                 (CBET 4455)              Daniel W. E. Green