Electronic Telegram No. 4287
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
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Prepared using the Tamkin Foundation Computer Network


COMET P/2016 M2 = P/2009 K1 (GIBBS)
     H. Sato, Tokyo, Japan, reports his recovery of comet P/2009 K1 (cf. IAUCs
9044, 9050) on CCD images obtained with an iTelescope 0.51-m f/6.8 astrograph
(+ luminance filter) at Siding Spring (his astrometry tabulated below).  All
the images showed a strongly condensed coma 10" in diameter.  Ten stacked 60-s
exposures taken on June 29 show a hint of tail 10" long toward p.a. 100 deg;
five stacked 60-s exposures taken on July 3.35 UT show a hint of tail 15" long
toward p.a. 105 deg.  The w-band magnitudes tabulated below were all as
measured within a circular aperture of radius 6".5-6".6.

     2016 UT             R.A. (2000) Decl.       Mag.   Observer
     June 29.35100    9 55 33.34   +13 13 57.5          Sato
          29.35428    9 55 33.96   +13 13 54.8            "
          29.35756    9 55 34.58   +13 13 52.0   17.8     "
     July  3.34782   10 08 12.23   +12 20 15.6            "
           3.34954   10 08 12.53   +12 20 13.8   18.0     "
           3.36078   10 08 14.66   +12 20 04.3            "
           3.36426   10 08 15.34   +12 20 01.2   17.8     "

The indicated correction to the prediction by S. Nakano in the ICQ's 2015
Comet Handbook is Delta(T) = -0.19 day.  The following linked orbital
elements by G. V. Williams (from 117 observations spanning 2009 Apr. 24-
2016 July 3; mean residual 0".5) and an ephemeris appear on MPEC 2016-N13.

                    Epoch = 2016 July 31.0 TT
     T = 2016 July 24.18589 TT        Peri. =  27.43351
     e = 0.6370964                    Node  = 172.77091 2000.0
     q = 1.3397446 AU                 Incl. =   5.74392
       a =  3.6917374 AU   n = 0.13894978   P =   7.09 years


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2016 CBAT
2016 July 4                      (CBET 4287)              Daniel W. E. Green