Electronic Telegram No. 5140
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 C/2022 J2 (BOK)
     An apparently asteroidal object discovered in the course of the Bok
survey in CCD images obtained with the Kitt Peak 2.25-m reflector, and
designated A/2022 J2 when announced on MPEC 2022-K80 (discovery observations
tabulated below), has been found to show cometary appearance in images taken
on June 26.3 UT by K. J. Meech, E. Bufanda, J. Kleyna, and J. V. Keane with
the 3.6-m Canada-France-Hawaii Telescope at Mauna Kea, with measurements by M.
Micheli and Kleyna showing a coma of diameter about 2".5 (magnitude about 22)
and a tail about 10" long in p.a. about 100 degrees in 1".0 seeing.

     2022 UT             R.A. (2000) Decl.       Mag.   Observer
     May   9.18802   12 49 21.49   +34 26 38.4   21.5   Meech
           9.19294   12 49 20.62   +34 26 41.2   22.5     "
           9.19785   12 49 19.68   +34 26 45.1   21.6     "
           9.20276   12 49 18.72   +34 26 48.3   21.6     "
           9.20730   12 49 17.85   +34 26 50.7   21.6     "
           9.20819   12 49 17.65   +34 26 51.0   22.1     "
           9.20908   12 49 17.50   +34 26 51.5            "
           9.20998   12 49 17.34   +34 26 52.8   22.0     "

Additional astrometry appears on MPEC 2022-M98.  The following unperturbed
orbital elements by S. Nakano (Central Bureau) are from 48 observations
spanning May 9-June 26 (mean residual 0".4) and indicate that the comet will
pass 1.94 AU from Jupiter on 2023 Aug. 12 and 4.54 AU from Saturn in 2025
April.

     T = 2022 Oct. 27.16281 TT        Peri. = 133.13461
     e = 0.9794707                    Node  = 252.53832 2000.0
     q = 1.8256468 AU                 Incl. = 149.08896

The following ephemeris by the undersigned from the above orbital elements
uses photometric power-law parameters H = 16.5 and 2.5n = 8 for the
magnitudes.

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase  Mag.
2022 05 21    12 14.41   +35 47.3    2.216    2.655   104.4    21.7  21.6
2022 05 31    11 49.78   +35 58.6    2.328    2.574    92.1    23.2  21.6
2022 06 10    11 30.31   +35 35.9    2.452    2.494    80.5    23.7  21.6
2022 06 20    11 15.62   +34 53.9    2.576    2.416    69.6    23.2  21.6
2022 06 30    11 04.94   +34 02.6    2.691    2.341    59.3    21.9  21.6
2022 07 10    10 57.48   +33 08.7    2.790    2.269    49.7    20.0  21.6
2022 07 20    10 52.49   +32 16.0    2.867    2.200    40.8    17.6  21.5

2022 10 08    10 42.28   +29 31.8    2.369    1.842    47.1    23.4  20.5
2022 10 18    10 37.91   +30 16.8    2.165    1.829    57.3    27.3  20.3
2022 10 28    10 30.13   +31 33.1    1.938    1.826    68.5    30.4  20.0
2022 11 07    10 16.60   +33 31.4    1.697    1.831    81.3    32.4  19.7
2022 11 17    09 53.12   +36 23.0    1.454    1.844    96.2    32.2  19.4
2022 11 27    09 11.83   +40 05.2    1.231    1.866   114.2    28.8  19.1
2022 12 07    08 01.27   +43 25.4    1.059    1.896   136.1    21.1  18.8


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

                         (C) Copyright 2022 CBAT
2022 June 29                     (CBET 5140)              Daniel W. E. Green