[Iaude] CBET 4598: 20190110 : COMET P/2019 A3 (PANSTARRS)

quai at eps.harvard.edu quai at eps.harvard.edu
Thu Jan 10 13:01:42 EST 2019


                                                  Electronic Telegram No. 4598
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau at eps.harvard.edu (alternate cbat at iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


COMET P/2019 A3 (PANSTARRS)
     R. Weryk and R. Wainscoat, Institute for Astronomy, University of Hawaii,
report the discovery of another comet on four w-band images obtained with the
1.8-m Pan-STARRS1 telescope at Haleakala on Jan. 3 UT (discovery observations
tabulated below, along with earlier Pan-STARRS1 observations found in 2018).
A stacked image on 2019 Jan. 3.3 UT shows a full-width-at-half-maximum of
about 1".9 for the comet in seeing ranging from 1".1 to 1".6.

     2018 UT             R.A. (2000) Decl.       Mag.
     Aug.  8.59515    1 45 29.64   - 0 42 56.3   23.8
           8.60228    1 45 29.88   - 0 42 53.8   22.9
           8.60942    1 45 30.10   - 0 42 51.8   23.4
           8.61658    1 45 30.32   - 0 42 49.9   23.3
          11.59551    1 46 59.15   - 0 28 24.9   23.8
          11.60344    1 46 59.35   - 0 28 23.2   22.2
          11.61140    1 46 59.56   - 0 28 20.6   22.5
          11.61937    1 46 59.76   - 0 28 18.4   22.4
          21.57665    1 50 14.30   + 0 14 42.7   23.5
          21.59120    1 50 14.41   + 0 14 46.1   22.7

     2019 UT             R.A. (2000) Decl.       Mag.
     Jan.  3.26880    1 06 49.18   +11 01 03.5   21.9
           3.28215    1 06 49.81   +11 01 10.6   21.8
           3.29550    1 06 50.43   +11 01 17.5   21.5

Weryk and Wainscoat add that three 60-s follow-up gri-band CCD exposures were
taken with the 3.6-m Canada-France-Hawaii Telescope at Mauna Kea by Wainscoat,
D. Woodworth, and S. Prunet on Jan. 4.3 and 10.23 UT, showing mag 21.3-21.5
and 21.9-22.2, respectively, and a short 3" and 6" tail (respectively) toward
the northeast; the FWHM of the comet's head was about 1".5 and 1".1,
respectively, in 0".6 seeing.
     The available astrometry (including additional pre-discovery Pan-STARRS2
observations from 2018 Oct. 10, Oct. 18, and Nov. 13, when the magnitude was
given as 21.2-21.4, 23.5, and 22.7-23.5, respectively), the following
elliptical orbital elements by G. V. Williams (from 34 observations spanning
2018 Aug. 8-2019 Jan. 10), and an ephemeris are given on MPEC 2019-A166.

                    Epoch = 2018 July 21.0 TT
     T = 2018 Aug.  1.80069 TT        Peri. = 325.47270
     e = 0.2648270                    Node  =  31.33334 2000.0
     q = 2.3134204 AU                 Incl. =  15.36716
       a =  3.1467699 AU   n = 0.17656580   P =   5.58 years


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

                         (C) Copyright 2019 CBAT
2019 January 10                  (CBET 4598)              Daniel W. E. Green



More information about the Iaude mailing list