[Iaude] CBET 4796: COMET C/2020 K8
quai at eps.harvard.edu
quai at eps.harvard.edu
Fri Jun 12 12:32:17 EDT 2020
Electronic Telegram No. 4796
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 K8 (CATALINA-ATLAS)
Independent discoveries of an apparently asteroidal object (discovery
observations tabulated below) have been made on CCD images taken with the
0.68-m Schmidt telescope of the Catalina Sky Survey (on May 25, 28, and 29)
and the 0.5-m f/2 Schmidt reflector at Haleakala, Hawaii, in the course of the
"Asteroid Terrestrial-Impact Last Alert System" (ATLAS) search program (on
June 7), and the object has been found to show cometary appearance
subsequently by numerous CCD astrometrists at other observing sites after the
object was posted on the Minor Planet Center's PCCP webpage (due to its
orbital elements, following a linkage of the separately posted four nights
by R. Weryk, University of Hawaii).
2020 UT R.A. (2000) Decl. Mag. Observer
May 25.43424 22 50 45.88 +15 31 37.1 19.3 Catalina
25.43832 22 50 46.29 +15 31 40.6 19.6 "
25.44238 22 50 46.68 +15 31 43.8 19.2 "
25.44645 22 50 47.12 +15 31 45.9 19.1 "
28.44403 22 55 43.96 +16 08 30.8 19.3 "
28.44933 22 55 44.60 +16 08 36.2 19.0 "
28.45462 22 55 45.08 +16 08 40.2 19.1 "
28.45992 22 55 45.58 +16 08 44.8 19.2 "
29.40536 22 57 21.20 +16 20 32.6 18.8 "
29.41066 22 57 21.80 +16 20 35.8 19.4 "
29.41595 22 57 22.26 +16 20 39.8 19.2 "
29.42125 22 57 22.78 +16 20 44.2 18.9 "
June 7.56494 23 13 40.17 +18 20 27.5 18.7 ATLAS
7.57711 23 13 41.58 +18 20 37.3 18.6 "
7.60122 23 13 44.37 +18 20 57.3 18.6 "
7.60675 23 13 44.94 +18 21 03.2 18.6 "
E. Guido, Castellammare di Stabia, Italy, reports that twenty-nine unfiltered,
stacked 60-s exposures taken remotely by M. Rocchetto, E. Bryssinck, M. Fulle,
G. Milani, C. Nassef, G. Savini, and himself on June 9.4 UT with a "Telescope
Live" 0.6-m f/6.5 astrograph at El Sauce, Chile, show a diffuse, irregular
coma about 10" in diameter; they measured mag 19.1-19.2. Twenty-four stacked
57-s unfiltered exposures taken by A. Valvasori and Guido on June 10.4 with
an iTelescope 0.61-m f/6.5 astrograph near Auberry, CA, USA, show a diffuse
coma about 15" in diameter (mag 18.1-18.7), slightly elongated toward p.a.
330 degrees. R. Ligustri writes that eleven 120-s exposures taken remotely
with a 0.45-m f/4.5 telescope near Mayhill, NM, USA, on June 10.4 show a
coma about 25" in diameter. G. Leonard writes that four stacked 30-s images
taken on June 11.4 with the University of Arizona's 1.54-m telescope at Mt.
Bigelow show a diffuse, concentric coma about 20" across surrounding an
obvious zone of central brightening that is about 8" across. Fourteen
stacked 60-s exposures taken remotely by H. Sato, Tokyo, Japan, with a 0.43-m
f/6.8 astrograph near Mayhill on June 11.4 show a strongly condensed round
coma 8" in diameter and no tail; the magnitude was 18.8 as measured within a
circular aperture of radius 5".7.
The available astrometry appear on MPEC 2020-L46. The following
preliminary parabolic orbital elements by S. Nakano, Sumoto, Japan, are from
64 observations spanning May 25-June 12 (mean residual 0".5).
T = 2020 Sept.14.4988 TT Peri. = 260.1120
Node = 181.4946 2000.0
q = 0.474139 AU Incl. = 31.4230
The following ephemeris by the undersigned from the above orbital elements
uses photometric power-law parameters H = 15.0 and 2.5n = 7.5 for the
magnitudes.
Date TT R. A. (2000) Decl. Delta r Elong. Phase Mag.
2020 04 21 22 00.57 +09 32.7 3.062 2.664 57.7 18.6 20.6
2020 04 26 22 07.34 +10 18.3 2.941 2.596 60.4 19.7 20.5
2020 05 01 22 14.24 +11 05.9 2.819 2.528 63.1 20.8 20.3
2020 05 06 22 21.29 +11 55.7 2.696 2.459 65.7 22.0 20.1
2020 05 11 22 28.52 +12 47.7 2.572 2.388 68.2 23.1 19.9
2020 05 16 22 35.97 +13 42.1 2.446 2.318 70.7 24.3 19.7
2020 05 21 22 43.67 +14 39.0 2.321 2.246 73.1 25.5 19.5
2020 05 26 22 51.68 +15 38.5 2.195 2.173 75.4 26.8 19.2
2020 05 31 23 00.07 +16 40.7 2.069 2.100 77.6 28.1 19.0
2020 06 05 23 08.91 +17 45.8 1.944 2.026 79.7 29.5 18.7
2020 06 10 23 18.33 +18 54.1 1.819 1.950 81.7 31.0 18.5
2020 06 15 23 28.48 +20 05.9 1.695 1.874 83.4 32.6 18.2
2020 06 20 23 39.53 +21 21.4 1.573 1.797 85.0 34.3 17.9
2020 06 25 23 51.73 +22 40.9 1.452 1.718 86.3 36.2 17.6
2020 06 30 00 05.44 +24 04.3 1.334 1.639 87.3 38.3 17.2
2020 07 05 00 21.11 +25 31.8 1.218 1.558 87.9 40.7 16.9
2020 07 10 00 39.40 +27 02.7 1.106 1.476 88.0 43.5 16.5
2020 07 15 01 01.19 +28 35.2 0.999 1.393 87.4 46.8 16.1
2020 07 20 01 27.63 +30 05.0 0.898 1.309 86.0 50.8 15.6
2020 07 25 02 00.21 +31 23.0 0.806 1.223 83.5 55.6 15.2
2020 07 30 02 40.52 +32 12.2 0.724 1.137 79.7 61.5 14.7
2020 08 04 03 29.47 +32 04.8 0.659 1.049 74.2 68.6 14.3
2020 08 09 04 25.96 +30 26.5 0.615 0.961 67.2 76.6 13.8
2020 08 14 05 25.78 +26 57.2 0.598 0.873 59.1 84.9 13.4
2020 08 19 06 23.14 +21 55.9 0.611 0.785 50.8 92.1 13.1
2020 08 24 07 13.99 +16 17.5 0.655 0.701 43.5 96.4 12.9
2020 08 29 07 57.50 +10 57.5 0.727 0.621 37.7 96.7 12.8
2020 09 03 08 35.01 +06 26.8 0.823 0.552 33.2 92.2 12.6
2020 09 08 09 08.56 +02 54.1 0.936 0.501 29.6 83.1 12.6
2020 09 13 09 39.82 +00 15.5 1.061 0.476 26.4 70.3 12.7
2020 09 18 10 09.55 -01 38.8 1.189 0.482 23.5 56.3 13.0
2020 09 23 10 37.64 -03 00.8 1.312 0.519 20.9 43.7 13.5
2020 09 28 11 03.67 -04 01.5 1.428 0.578 18.8 33.9 14.0
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2020 CBAT
2020 June 12 (CBET 4796) Daniel W. E. Green
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