[Iaude] CBET 5403: COMET P/2024 K1
quai at eps.harvard.edu
quai at eps.harvard.edu
Tue Jun 11 13:42:10 EDT 2024
Electronic Telegram No. 5403
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/2024 K1 (PANSTARRS)
R. Weryk, Department of Physics and Astronomy, University of Western
Ontario, reports the discovery of another comet in images obtained with the
Pan-STARRS1 1.8-m Ritchey-Chretien reflector at Haleakala (discovery
observations tabulated below). Four 45-s w-band survey images taken in 1".3
seeing show a condensed coma of size 1".6 (full-width-at-half-maximum) but
no tail.
2024 UT R.A. (2000) Decl. Mag.
May 30.41847 16 20 39.04 -21 39 36.3 20.7
30.42560 16 20 38.78 -21 39 35.3 21.0
30.43272 16 20 38.55 -21 39 34.4 21.1
30.44033 16 20 38.27 -21 39 33.7 21.3
Weryk reports that six 60-s gri-band poor-quality follow-up images were
obtained on May 31.5 UT with the 3.6-m Canada-France-Hawaii Telescope (aided
by R. Wainscoat, L. Wells, and T. Burdullis) show a slightly larger image
(1".8 FWHM) for the comet compared to stars. Three additional 90-s CFHT
images were taken on June 1.4 that show this object to be definitely a comet;
the best image in 1".0 seeing shows a very condensed head of size 1".4 (FWHM)
with evidence of a broad-but-short tail 1" long spanning p.a. 240-340 deg.
After the comet was posted on the Minor Planet Center's PCCP webpage,
H. Sato (Bunkyo-ku, Tokyo, Japan) reported that twelve stacked 120-s CCD
exposures taken remotely on June 6.6 UT with a 0.51-m f/6.8 astrograph located
at Siding Spring, NSW, Australia, show a moderately condensed coma 8" in
diameter with no tail; the magnitude was 19.8 as measured within a circular
aperture of radius 4".3.
The available astrometry appears on MPEC 2024-L114. The following
preliminary orbital elements by S. Nakano (Central Bureau) are from 28
observations spanning May 30-June 10 (mean residual 0".2). A parabolic orbit
shows a mean error of 1".0. There appear to be no observations in archival
data, and there appear to be no close approaches to any major planets.
T = 2024 May 9.99582 TT Peri. = 352.11737
e = 0.4956511 Node = 251.69581 2000.0
q = 3.4539059 AU Incl. = 1.78348
a = 6.8482478 AU n = 0.05499648 P = 17.92 years
The following ephemeris by the undersigned from the above orbital elements
uses photometric power-law parameters H = 13.5 and 2.5n = 8 for the
magnitudes.
Date TT R. A. (2000) Decl. Delta r Elong. Phase Mag.
2024 05 10 16 31.41 -22 13.4 2.488 3.454 159.9 5.8 19.8
2024 05 20 16 26.40 -21 57.9 2.452 3.455 170.8 2.7 19.8
2024 05 30 16 20.88 -21 40.3 2.443 3.456 178.3 0.5 19.7
2024 06 09 16 15.48 -21 22.2 2.461 3.459 167.5 3.7 19.8
2024 06 19 16 10.82 -21 05.4 2.507 3.464 156.8 6.6 19.8
2024 06 29 16 07.42 -20 51.6 2.576 3.469 146.4 9.3 19.9
2024 07 09 16 05.61 -20 42.2 2.668 3.476 136.4 11.6 20.0
2024 07 19 16 05.61 -20 38.1 2.778 3.484 126.9 13.5 20.1
2024 07 29 16 07.45 -20 39.4 2.902 3.493 117.8 14.9 20.2
2024 08 08 16 11.08 -20 45.6 3.038 3.503 109.1 15.9 20.3
2024 08 18 16 16.42 -20 56.2 3.183 3.514 100.7 16.4 20.4
2024 08 28 16 23.30 -21 10.0 3.332 3.527 92.7 16.6 20.5
2024 09 07 16 31.58 -21 26.0 3.484 3.541 85.0 16.5 20.6
2024 09 17 16 41.09 -21 42.8 3.635 3.555 77.5 16.0 20.7
2024 09 27 16 51.69 -21 59.5 3.784 3.571 70.2 15.3 20.8
2024 10 07 17 03.23 -22 15.0 3.929 3.588 63.0 14.4 20.9
2024 10 17 17 15.56 -22 28.2 4.067 3.606 56.0 13.2 21.0
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2024 CBAT
2024 June 11 (CBET 5403) Daniel W. E. Green
More information about the Iaude
mailing list