IAU Electronic Telegram No. 4635

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/2019 K3 = P/2007 R1 (LARSON)
     E. Schwab, Egelsbach, Germany, reports his recovery of comet P/2007 R1
(cf. IAUC 8867) on CCD images taken remotely with the 0.8-m f/3 Schmidt
reflector at Calar Alto, Spain, on two nights (May 29 and June 3 UT); no coma
and no tail was visible on frames with a total exposure time of 600 s.  G. V.
Williams, Minor Planet Center, reports his recovery of this comet also in
incidental astrometry submitted by the Pan-STARRS1 survey (apparently
asteroidal images obtained with the 1.8-m Ritchey-Chretien reflector at
Haleakala on May 31).  The astrometry is tabulated below.

     2019 UT             R.A. (2000) Decl.       Mag.   Observer
     May  29.08794   16 42 15.85   -13 26 23.9   21.9   Schwab
          29.10684   16 42 15.21   -13 26 22.0   21.7     "
          29.11628   16 42 14.94   -13 26 22.4   22.1     "
          31.45154   16 41 08.96   -13 23 24.6   22.0   PanSTARRS1
          31.46447   16 41 08.59   -13 23 23.4   22.0     "
          31.49031   16 41 07.86   -13 23 21.6   21.9     "
     June  3.00463   16 39 56.43   -13 20 20.5   22.1   Schwab
           3.01404   16 39 56.12   -13 20 19.1   21.6     "
           3.02346   16 39 55.88   -13 20 18.5   21.3     "
           3.03287   16 39 55.56   -13 20 17.7   22.1     "

The indicated correction to the prediction by Williams on MPC 75514 is
Delta(T) = -0.08 day.  The following linked orbital elements by Williams
(from 226 observations spanning 2007 Sept. 4-2019 June 3; mean residual 0".6)
and an ephemeris appear on MPEC 2019-L42.

                    Epoch = 2022 Mar. 2.0 TT
     T = 2022 Feb. 17.41718 TT        Peri. = 170.98593
     e = 0.3169734                    Node  = 173.74093 2000.0
     q = 4.4197574 AU                 Incl. =   8.31059
       a =  6.4708426 AU   n = 0.05987738   P =  16.46 years


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2019 CBAT
2019 June 4                      (CBET 4635)              Daniel W. E. Green