IAU Electronic Telegram No. 4406

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 M2 = P/2004 T1 (LINEAR-NEAT)
     Erwin Schwab, Egelsbach, Germany, reports the recovery of comet P/2004 T1
(cf. IAUC 8416) on CCD images taken by Pablo Ruiz with a 1.0-m f/4.4 reflector
at the European Space Agency's Optical Ground Station, Tenerife (with
measuring assistance by M. Micheli, D. Koschny, A. Knoefel, and M. Busch); the
comet shows no coma but a weak, wide tail extending at least 10" in
p.a. 270 deg.

     2017 UT             R.A. (2000) Decl.       Mag.   Observer
     June 21.17155    0 34 26.33   - 9 23 02.6   19.6   Ruiz
          21.17759    0 34 27.04   - 9 22 59.4   19.5     "
          21.18362    0 34 27.68   - 9 22 55.8   19.5     "
          22.17362    0 36 19.99   - 9 13 48.1   19.1     "
          22.18569    0 36 21.36   - 9 13 41.2   19.3     "

The indicated correction to the prediction by B. G. Marsden on MPC 89018 is
Delta(T) = -0.57 day.
     The following linked orbital elements by G. V. Williams (from 424
observations spanning 2004 July 16-2017 June 22; mean residual 0".6) and an
ephemeris appear on MPEC 2017-M40.  The 2011 return was missed (the comet
being in conjunction with the sun while near perihelion).

                    Epoch = 2011 Apr. 29.0 TT
     T = 2011 Apr. 24.57212 TT        Peri. = 336.40391
     e = 0.5081218                    Node  =  51.43995 2000.0
     q = 1.7077337 AU                 Incl. =  11.04460
       a =  3.4718628 AU   n = 0.15235624   P =   6.47 years

                    Epoch = 2017 Oct. 14.0 TT
     T = 2017 Oct. 12.68623 TT        Peri. = 336.34336
     e = 0.5064300                    Node  =  51.45940 2000.0
     q = 1.7159573 AU                 Incl. =  11.03260
       a =  3.4766242 AU   n = 0.15204336   P =   6.48 years


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2017 CBAT
2017 June 22                     (CBET 4406)              Daniel W. E. Green