[Iaude] CBET 4550: 20180819 : COMET C/2018 P5 (PANSTARRS)

quai at eps.harvard.edu quai at eps.harvard.edu
Sat Aug 18 20:56:32 EDT 2018


                                                  Electronic Telegram No. 4550
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 C/2018 P5 (PANSTARRS)
     Y. Ramanjooloo and R. Wainscoat report the discovery of another comet in
four w-band CCD exposures taken with the 1.8-m Pan-STARRS1 Ritchey-Chretien
telescope at Haleakala on Aug. 11 UT (discovery observations tabulated below,
together with numerous pre-discovery Pan-STARRS1 observations from June and
July that were identified later); the object's head showed a full-width-at-
half-maximum of about 1".65 in seeing of about 1".5, and it displays a thin
dust tail extending about 5" towards position angle 240 degrees.

     2018 UT             R.A. (2000) Decl.       Mag.
     June 16.58682   21 46 18.37   - 4 52 08.1   21.7
          16.59597   21 46 18.42   - 4 52 07.1   21.9
          23.55034   21 46 31.75   - 4 41 17.9   21.8
          23.56300   21 46 31.74   - 4 41 16.9   21.5
          23.57563   21 46 31.72   - 4 41 15.9   21.8
          23.58829   21 46 31.69   - 4 41 15.0   21.9
     July 13.46549   21 44 07.54   - 4 30 17.0   21.7
          13.47788   21 44 07.37   - 4 30 17.3   21.5
          13.49022   21 44 07.18   - 4 30 17.6   21.2
          13.50266   21 44 06.99   - 4 30 17.7   21.2
     Aug. 11.45034   21 34 26.75   - 5 06 40.8   20.9
          11.46145   21 34 26.47   - 5 06 42.2   21.2
          11.47253   21 34 26.20   - 5 06 43.7   21.1
          11.48359   21 34 25.93   - 5 06 45.2   21.2

M. Micheli writes that CCD observations obtained on Aug. 12.39 UT by R. J.
Wainscoat and D. Woodworth with the 3.6-m Canada-France-Hawaii Telescope at
Mauna Kea (measured by Micheli, Wainscoat, and Ramanjooloo) show a tail about
5" long in p.a. about 240 degrees; the coma had FWHM = 1".1 in 0".9 seeing.
     The available astrometry, the following elliptical orbital elements by
G. V. Williams (from 33 observations spanning July 10-Aug. 18), and an
ephemeris appear on MPEC 2018-Q36.

                    Epoch = 2019 Mar. 18.0 TT
     T = 2019 Feb. 26.2643 TT         Peri. = 131.6400
     e = 0.640954                     Node  = 216.2424  2000.0
     q = 4.575731 AU                  Incl. =   7.2568
       a = 12.744122 AU    n = 0.0216640    P =  45.5 years


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2018 CBAT
2018 August 19                   (CBET 4550)              Daniel W. E. Green



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