[Iaude] CBET 5381: COMET C/2024 G1
quai at eps.harvard.edu
quai at eps.harvard.edu
Wed Apr 17 13:27:10 EDT 2024
Electronic Telegram No. 5381
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/2024 G1 (WIERZCHOS)
Kacper W. Wierzchos, Lunar and Planetary Laboratory, University of
Arizona, reports his discovery of a comet on mosaic CCD images obtained with
the 2.25-m "Bok" reflector at Kitt Peak as part of a collaborative program
(cf. CBET 5103) on Apr. 7 UT (discovery observations tabulated below). Four
30-s exposures showed a diffuse 6" coma and a broad 9" tail spanning p.a.
260-290 degrees.
2024 UT R.A. (2000) Decl. Mag. Observer
Apr. 7.47946 19 33 30.68 +61 20 39.2 Wierzchos
7.48639 19 33 30.25 +61 20 44.5 20.6 "
7.49326 19 33 29.84 +61 20 49.4 20.3 "
7.50013 19 33 29.42 +61 20 54.5 20.2 "
After the comet was posted on the Minor Planet Center's PCCP webpage, other
CCD astrometrists also confirmed the cometary appearance. Fourteen stacked
60-s exposures taken remotely by H. Sato (Tokyo, Japan) with a 0.51-m f/6.8
astrograph located at the Utah Desert Remote Observatory (near Beryl Junction,
UT, USA) show a strongly condensed coma 8" in diameter with no tail; the
magnitude was 20.2 as measured within a circular aperture of radius 4".9.
R. A. Mastaler (University of Arizona) reports that 60-s exposures taken in
2".0 seeing on Apr. 12.4 UT with the Spacewatch 1.8-m f/2.7 reflector at Kitt
Peak show a faint coma but no definite tail; the magnitude was measured to be
R = 19.7.
The available astrometry appears on MPEC 2024-H10. The following
parabolic orbital elements by S. Nakano (Central Bureau) are from 39
observations spanning 2024 Apr. 7-15 (mean residual 0".5). The comet passed
2.77 AU from Uranus in 2017.
T = 2024 Oct. 22.85117 TT Peri. = 128.65364
Node = 30.27974 2000.0
q = 3.9280018 AU Incl. = 95.44068
The following ephemeris by the undersigned from the above orbital elements
uses photometric power-law parameters H = 11.5 and 2.5n = 8 for the
magnitudes.
Date TT R. A. (2000) Decl. Delta r Elong. Phase Mag.
2024 03 31 19 39.37 +59 52.4 4.390 4.309 78.8 13.1 19.8
2024 04 10 19 30.96 +61 50.9 4.314 4.275 81.1 13.4 19.7
2024 04 20 19 17.52 +63 50.1 4.238 4.242 83.4 13.6 19.7
2024 04 30 18 57.84 +65 41.1 4.167 4.211 85.6 13.8 19.6
2024 05 10 18 30.99 +67 11.3 4.103 4.181 87.4 14.0 19.5
2024 05 20 17 57.24 +68 05.9 4.048 4.152 88.8 14.1 19.5
2024 05 30 17 18.95 +68 10.5 4.006 4.125 89.6 14.2 19.4
2024 06 09 16 40.45 +67 17.0 3.979 4.100 89.6 14.3 19.4
2024 06 19 16 06.14 +65 27.1 3.967 4.076 88.9 14.4 19.4
2024 06 29 15 38.55 +62 51.0 3.972 4.054 87.3 14.5 19.4
2024 07 09 15 18.01 +59 41.7 3.993 4.034 85.0 14.5 19.4
2024 07 19 15 03.71 +56 12.0 4.029 4.015 81.9 14.5 19.4
2024 07 29 14 54.40 +52 32.4 4.079 3.998 78.3 14.4 19.4
2024 08 08 14 48.98 +48 50.6 4.139 3.983 74.1 14.2 19.4
2024 08 18 14 46.54 +45 12.6 4.207 3.969 69.6 13.8 19.4
2024 08 28 14 46.35 +41 42.3 4.280 3.958 64.9 13.4 19.4
2024 09 07 14 47.90 +38 22.4 4.354 3.948 60.0 12.8 19.5
2024 09 17 14 50.77 +35 14.8 4.425 3.940 55.3 12.1 19.5
2024 09 27 14 54.63 +32 20.4 4.491 3.934 50.8 11.4 19.5
2024 10 07 14 59.24 +29 39.6 4.548 3.930 46.7 10.7 19.5
2024 10 17 15 04.38 +27 12.7 4.594 3.928 43.3 10.0 19.6
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2024 CBAT
2024 April 17 (CBET 5381) Daniel W. E. Green
More information about the Iaude
mailing list