[Iaude] CBET 4784: COMET C/2019 K6
quai at eps.harvard.edu
quai at eps.harvard.edu
Mon May 25 21:49:49 EDT 2020
Electronic Telegram No. 4784
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/2019 K6 (PANSTARRS)
An apparently asteroidal object discovery with the Pan-STARRS2 1.8-m
Ritchey-Chretien reflector at Haleakala on 2019 May 31.6 UT has been found
to show cometary appearance by CCD astrometrists elsewhere. The comet was
given the designation A/2019 K6 when announced on MPEC 2019-N10; the discovery
observations are tabulated below along with pre-discovery Pan-STARRS1
observations also found on 2019 May 7.5.
2019 UT R.A. (2000) Decl. Mag.
May 7.46071 18 01 14.06 +16 07 39.0 21.1
7.47302 18 01 13.28 +16 07 41.0 21.3
7.48531 18 01 12.51 +16 07 42.8 20.9
31.55619 17 31 08.36 +16 32 19.8 20.6
31.55619 17 31 08.37 +16 32 19.9 21.1
31.56847 17 31 07.32 +16 32 19.2 20.8
31.56847 17 31 07.43 +16 32 19.0 24.2
31.58080 17 31 06.27 +16 32 18.7 20.9
31.58080 17 31 06.26 +16 32 18.5 20.9
H. Sato, Tokyo, Japan, reports that CCD images taken with a 0.51-m f/6.8
astrograph at Siding Spring, NSW, Australia, on 2020 Mar. 20.78 UT show a
strongly condensed coma 12" in diameter; the magnitude was 18.2 as measured
within a circular aperture of radius 6".5. Four stacked 30-s exposures
taken on 2020 Apr. 24.4 by K. Wierzchos with the Mount Lemmon 1.5-m
reflector show a short, diffuse tail. E. Guido, Castellammare di Stabia,
Italy, writes that twelve stacked 60-s unfiltered exposures taken remotely
on 2020 Apr. 25.5 with an iTelescope 0.50-m f/6.8 astrograph at Siding Spring
show a compact coma about 5" in diameter and a tail 20" long in p.a. 55
degrees; the magnitude was measured to be 18.5-18.9.
Upon a request for additional information by the Central Bureau, R.
Weryk, Institute for Astronomy, University of Hawaii, writes that 45-s w-band
Pan-STARRS1 images taken during the past month show this object to be clearly
a comet. On 2020 Apr. 26, there was a tail > 40" long in p.a. 60 degrees; on
Apr. 28, the images show a tail > 30" long in p.a. 60 deg; on May 15, there
was a tail > 30" long in p.a. 70 deg; and on May 19, there was a tail > 40"
long in p.a. 70 deg. The coma on the four nights was 2".9, 2".6, 1".6, and
2".1 in size (full-width-at-half-maximum) with seeing being 1".7, 1".4, 1".0,
and 1".5, respectively.
The following orbital elements by S. Nakano, Sumoto, Japan, are from
278 observations spanning 2019 May 7-2020 Apr. 28 (mean residual 0".50). The
corresponding original and future values of 1/a are +0.001026 and +0.001213
AU**-1, respectively; the comet passed 2.60 AU from Jupiter on 2019 Aug. 6 UT.
Epoch = 2020 May 31.0 TT
T = 2020 May 20.17397 TT Peri. = 187.61571
e = 0.9973879 Node = 42.94005 2000.0
q = 3.9286413 AU Incl. = 132.37332
The following ephemeris by the undersigned, from the above orbital elements,
uses photometric power-law parameters H = 11.0 and 2.5n = 8 for the magnitudes.
Date TT R. A. (2000) Decl. Delta r Elong. Phase Mag.
2020 04 21 14 46.38 -18 32.0 2.954 3.937 166.1 3.5 18.1
2020 04 26 14 35.45 -18 39.0 2.934 3.934 172.8 1.8 18.1
2020 05 01 14 24.35 -18 42.8 2.927 3.932 175.7 1.1 18.1
2020 05 06 14 13.26 -18 43.6 2.932 3.931 170.3 2.5 18.1
2020 05 11 14 02.36 -18 41.8 2.951 3.929 163.4 4.2 18.1
2020 05 16 13 51.82 -18 37.7 2.982 3.929 156.3 5.9 18.1
2020 05 21 13 41.76 -18 32.0 3.024 3.929 149.3 7.6 18.2
2020 05 26 13 32.31 -18 25.1 3.077 3.929 142.4 9.0 18.2
2020 05 31 13 23.55 -18 17.8 3.140 3.930 135.7 10.4 18.2
2020 06 05 13 15.52 -18 10.7 3.211 3.931 129.1 11.5 18.3
2020 06 10 13 08.26 -18 04.3 3.289 3.933 122.8 12.5 18.3
2020 06 15 13 01.77 -17 58.9 3.374 3.935 116.6 13.3 18.4
2020 06 20 12 56.02 -17 55.0 3.463 3.938 110.6 14.0 18.5
2020 06 25 12 51.00 -17 52.8 3.557 3.941 104.8 14.4 18.5
2020 06 30 12 46.65 -17 52.5 3.653 3.945 99.2 14.7 18.6
2020 07 05 12 42.95 -17 54.3 3.750 3.949 93.7 14.9 18.6
2020 07 10 12 39.84 -17 58.2 3.849 3.953 88.4 14.9 18.7
2020 07 15 12 37.27 -18 04.3 3.947 3.958 83.2 14.8 18.8
2020 07 20 12 35.20 -18 12.4 4.045 3.964 78.2 14.5 18.8
2020 07 25 12 33.58 -18 22.7 4.141 3.970 73.3 14.2 18.9
2020 07 30 12 32.37 -18 35.1 4.234 3.976 68.5 13.7 18.9
2020 08 04 12 31.53 -18 49.5 4.324 3.983 63.9 13.2 19.0
2020 08 09 12 31.02 -19 05.9 4.411 3.990 59.3 12.6 19.0
2020 08 14 12 30.80 -19 24.1 4.495 3.998 54.9 12.0 19.1
2020 08 19 12 30.85 -19 44.2 4.573 4.006 50.5 11.2 19.1
2020 08 24 12 31.12 -20 06.1 4.647 4.015 46.3 10.5 19.2
2020 08 29 12 31.59 -20 29.7 4.715 4.024 42.2 9.7 19.2
2020 09 03 12 32.24 -20 55.0 4.778 4.034 38.2 8.9 19.2
2020 09 08 12 33.02 -21 21.8 4.835 4.044 34.4 8.1 19.3
2020 09 13 12 33.93 -21 50.2 4.886 4.054 30.7 7.3 19.3
2020 09 18 12 34.94 -22 20.1 4.931 4.065 27.4 6.5 19.3
2020 09 23 12 36.02 -22 51.6 4.969 4.076 24.4 5.8 19.4
2020 09 28 12 37.14 -23 24.4 5.001 4.088 21.9 5.2 19.4
2020 10 03 12 38.29 -23 58.6 5.026 4.100 20.0 4.8 19.4
2020 10 08 12 39.45 -24 34.2 5.044 4.112 19.1 4.6 19.4
2020 10 13 12 40.58 -25 11.2 5.055 4.125 19.1 4.5 19.4
2020 10 18 12 41.68 -25 49.5 5.060 4.138 20.1 4.8 19.5
2020 10 23 12 42.70 -26 29.1 5.058 4.152 22.0 5.2 19.5
2020 10 28 12 43.63 -27 09.9 5.049 4.166 24.6 5.7 19.5
2020 11 02 12 44.44 -27 52.0 5.034 4.181 27.6 6.3 19.5
2020 11 07 12 45.10 -28 35.3 5.013 4.195 31.1 7.0 19.5
2020 11 12 12 45.58 -29 19.8 4.985 4.210 34.8 7.7 19.5
2020 11 17 12 45.86 -30 05.4 4.952 4.226 38.7 8.4 19.5
2020 11 22 12 45.89 -30 52.0 4.914 4.242 42.8 9.1 19.5
2020 11 27 12 45.64 -31 39.7 4.870 4.258 46.9 9.7 19.5
2020 12 02 12 45.07 -32 28.2 4.822 4.275 51.2 10.4 19.5
2020 12 07 12 44.14 -33 17.5 4.770 4.291 55.6 10.9 19.5
2020 12 12 12 42.82 -34 07.4 4.714 4.309 60.1 11.4 19.4
2020 12 17 12 41.04 -34 57.7 4.655 4.326 64.7 11.9 19.4
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 4784) Daniel W. E. Green
More information about the Iaude
mailing list