[Iaude] CBET 4783: COMET C/2020 K4

quai at eps.harvard.edu quai at eps.harvard.edu
Mon May 25 01:23:17 EDT 2020


                                                  Electronic Telegram No. 4783
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/2020 K4 (PANSTARRS)
     R. Weryk, Institute for Astronomy, University of Hawaii, reports the
discovery of another comet noticed first by R. Wainscoat in images obtained
with the Pan-STARRS1 1.8-m Ritchey-Chretien reflector at Haleakala on May 20
(with no tail, and the comet's head having a size of 2".4 (full-width-at-
half-maximum) in 1".5 seeing.  Follow-up was done with the 3.6-m Canada-
France-Hawaii telescope at Mauna Kea by Wainscoat, C. Crowder, C. Wipper, T.
Burdullis, and S. Pruneton on four nights, via 40-s gri-band images on May 21
and 22, and 60-s gri-band images on May 23 and 24.  The coma appears to be
not very active, but the comet exhibits a broad, diffuse dust tail toward the
southwest (listed as an extension on May 21, about 4" long on May 22, and
about 3" long on May 23); the CFHT images are less suggestive of much coma,
with the comet's head being only about 0".2-0".5 (FWHM) larger than the
images of nearby stars.  The astrometry are provided below.

     2020 UT             R.A. (2000) Decl.       Mag.   Observer
     May  20.53404   19 54 05.85   -33 20 17.7   19.7   Pan-STARRS1
          20.54395   19 54 02.84   -33 20 09.6   20.0     "
          20.56375   19 53 56.78   -33 19 53.2   20.0     "
          21.56414   19 48 52.17   -33 05 27.7   19.9   CFHT
          21.56509   19 48 51.87   -33 05 26.7   19.9     "
          21.56603   19 48 51.57   -33 05 25.8   20.2     "
          21.56725   19 48 51.19   -33 05 24.7   20.1     "
          22.58949   19 43 32.19   -32 49 32.8   20.3     "
          22.59051   19 43 31.86   -32 49 31.8   20.2     "
          22.59146   19 43 31.56   -32 49 30.8   20.4     "
          23.59591   19 38 10.95   -32 32 45.8   20.0     "
          23.59709   19 38 10.57   -32 32 44.5   20.2     "
          23.59828   19 38 10.18   -32 32 43.3   20.2     "
          24.58582   19 32 48.41   -32 15 04.9   20.5     "
          24.58703   19 32 48.03   -32 15 03.6   20.1     "
          24.58839   19 32 47.54   -32 15 02.0   20.3     "
          24.58957   19 32 47.18   -32 15 00.7   20.7     "
          24.59081   19 32 46.74   -32 14 59.3   19.8     "
          24.59200   19 32 46.37   -32 14 58.0   20.6     "
          24.59436   19 32 45.59   -32 14 55.4   20.1     "

     The following preliminary parabolic orbital elements by the undersigned
are from the above 20 observations spanning May 20-24.

     T = 2020 Mar.  8.8853 TT         Peri. = 311.5219
                                      Node  = 264.1228  2000.0
     q = 1.789562 AU                  Incl. = 126.2414

The following ephemeris by the undersigned, from the above very preliminary
orbital elements, uses photometric power-law parameters H = 17.0 and 2.5n = 8
for the magnitudes.

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase  Mag.
2020 04 21    21 28.88   -36 16.7    1.783    1.873    79.0    31.8  20.4
2020 04 26    21 19.20   -36 00.5    1.687    1.892    85.3    32.0  20.4
2020 05 01    21 07.40   -35 43.3    1.591    1.914    92.1    31.7  20.3
2020 05 06    20 53.09   -35 22.4    1.497    1.937    99.4    30.9  20.2
2020 05 11    20 35.89   -34 54.2    1.407    1.962   107.4    29.4  20.1
2020 05 16    20 15.49   -34 13.5    1.325    1.989   116.1    27.2  20.0
2020 05 21    19 51.76   -33 13.7    1.252    2.017   125.6    24.1  19.9
2020 05 26    19 24.97   -31 47.7    1.194    2.046   135.9    20.2  19.9
2020 05 31    18 55.87   -29 50.0    1.153    2.077   146.9    15.5  19.8
2020 06 05    18 25.73   -27 19.4    1.132    2.109   158.4    10.2  19.9
2020 06 10    17 56.07   -24 21.4    1.135    2.142   170.2     4.6  19.9
2020 06 15    17 28.31   -21 07.7    1.161    2.176   177.4     1.2  20.0
2020 06 20    17 03.43   -17 51.9    1.210    2.212   166.7     6.1  20.2
2020 06 25    16 41.90   -14 46.4    1.280    2.248   156.2    10.5  20.4
2020 06 30    16 23.79   -11 59.1    1.367    2.285   146.5    14.2  20.5
2020 07 05    16 08.83   -09 33.2    1.468    2.323   137.6    17.2  20.8
2020 07 10    15 56.66   -07 29.1    1.581    2.361   129.5    19.4  21.0


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

                         (C) Copyright 2020 CBAT
2020 May 25                      (CBET 4783)              Daniel W. E. Green



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