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(13366) 1998 US24
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(13366) 1998 US24 (provisional designation 1998 US24) is a Jupiter trojan from the Greek camp, approximately 33 kilometers (21 miles) in diameter. It was discovered on 18 October 1998, by astronomers with the Lowell Observatory Near-Earth-Object Search at the Anderson Mesa Station near Flagstaff, Arizona, in the United States.[1] The dark Jovian asteroid is a slow rotator with a long rotation period of potentially 400 hours.[7] It has not been named since its numbering in January 2000.[8]
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Orbit and classification
1998 US24 is a dark Jovian asteroid in a 1:1 orbital resonance with Jupiter. It is located in the leading Greek camp at the Gas Giant's L4 Lagrangian point, 60° ahead of its orbit .[3] It is also a non-family asteroid in the Jovian background population.[4] It orbits the Sun at a distance of 4.7–5.8 AU once every 11 years and 12 months (4,367 days; semi-major axis of 5.23 AU). Its orbit has an eccentricity of 0.10 and an inclination of 7° with respect to the ecliptic.[2] The body's observation arc begins with a precovery taken at Palomar Observatory in February 1954, more than 44 years prior to its official discovery observation at Anderson Mesa.[1]
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Numbering and naming
This minor planet was numbered by the MPC on 24 January 2000 (M.P.C. 37586).[8] As of 2018, it has not been named.[1]
Physical characteristics
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1998 US24 is an assumed C-type asteroid, while most larger Jupiter trojans are D-types.[7]
Rotation period
In August 2015, a first rotational lightcurve of 1998 US24 was obtained from photometric observations by the Kepler space telescope during its K2 mission. Lightcurve analysis gave a rotation period of 400±105 hours with a brightness variation of 0.23 magnitude (U=2-).[6] One month later, a second, lower-rated lightcurve by Kepler determined an alternative period of 522±36 hours with an amplitude of 0.20 (U=1+).[9] As of 2018, no secure period of this slow rotator has yet been obtained.[7]
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 1998 US24 measures 33.30 kilometers in diameter and its surface has an albedo of 0.058,[5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 32.03 kilometers based on an absolute magnitude of 11.2.[7]
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References
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