[Iaude] CBET 4605: 20190123 : COMET P/2019 A7 (PANSTARRS)

quai at eps.harvard.edu quai at eps.harvard.edu
Wed Jan 23 13:09:33 EST 2019


                                                  Electronic Telegram No. 4605
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 A7 (PANSTARRS)
     Yudish Ramanjooloo, Rob Weryk, and Richard Wainscoat report the discovery
of another comet in four 45-s w-band exposures taken with the 1.8-m
Pan-STARRS1 telescope at Haleakala on Jan. 8.4 UT (discovery observations
tabulated below).  The object then showed a slight fuzzy extension about 3"
long in p.a. 290 degrees; in 1".2 seeing, the comet's head had a full-width-
at-half-maximum of about 1".6.

     2019 UT             R.A. (2000) Decl.       Mag.
     Jan.  8.37792    8 25 17.15   +10 02 51.2   20.4
           8.38898    8 25 16.57   +10 02 49.3   20.6
           8.40002    8 25 15.97   +10 02 47.4   20.4
           8.41110    8 25 15.38   +10 02 45.7   20.4

Three 60-s gri-band confirming images were taken by Wainscoat, D. Woodworth,
A. Petric, and Weryk on 2019 Jan. 9.50 UT with the 3.6-m Canada-France-Hawaii
Telescope at Mauna Kea, in which the object looks cometary, having FWHM =
0".91 (larger than nearby stars with FWHM = 0".66), and there is evidence of
a faint tail extending to the northwest for > 5".  After the object was
posted on the Minor Planet Center's PCCP webpage, other CCD astrometrists
reported on the cometary appearance.  R. A. Mastaler noted "cometary features"
with measured red magnitude 19.8-19.9 on images taken with the Spacewatch
0.9-m f/3 reflector at Kitt Peak in 1".3 seeing on Jan. 12.3; using the same
telescope, R. S. McMillan found the object diffuse in 1".8 seeing on Jan.
17.2 in 1".8 seeing.
     The available astrometry (including pre-discovery Pan-STARRS1
observations from 2017 Oct. 3, Oct. 27, and Nov. 9, when the presumably
asteroidal object was at mag 21.1-22.1), the following elliptical orbital
elements by G. V. Williams (from 53 observations spanning 2017 Oct. 3-
2019 Jan. 17), and an ephemeris appear on MPEC 2019-B66.

                    Epoch = 2018 Jan.  2.0 TT
     T = 2018 Jan.  8.32972 TT        Peri. = 119.60838
     e = 0.1607682                    Node  = 280.52535 2000.0
     q = 2.6760267 AU                 Incl. =  17.77068
       a =  3.1886621 AU   n = 0.17309771   P =   5.69 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 23                  (CBET 4605)              Daniel W. E. Green



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