|Minor planet category||centaur|
|Epoch JD 2456400.5 (18 April 2013)|
|Semi-major axis||19.090 AU|
|Orbital period||83.87 yr (30,635 d)|
|Longitude of ascending node||222.49°|
|Argument of perihelion||287.51°|
|Absolute magnitude (H)||9.6 (r-band)
2011 QF99 is the first and as of 2013 the only Uranus trojan identified. It was discovered in 2011 during a deep survey of trans-Neptunian objects conducted with the Canada–France–Hawaii Telescope. It is believed to be roughly 60 km in diameter, assuming an albedo of 0.05.
2011 QF99 temporarily orbits near Uranus's L4 Langrangian point (leading Uranus). It will continue to librate around L4 for at least 70,000 years and will remain a Uranus co-orbital for up to three million years before becoming a centaur. 2011 QF99 is thus a temporary Uranus trojan—a centaur captured some time ago.
Uranus trojans are generally expected to be unstable and none of them are thought to be of primordial origin. A simulation study concluded that at any given time, 0.4% of the centaurs in the scattered population within 34 AU would be Uranus co-orbitals; of these, it was predicted that 64% would be in horseshoe orbits, 10% would be quasi-satellites, and 26% would be trojans (evenly split between the L4 and L5 groups).
- "JPL Small-Body Database Browser: 2011 QF99". Retrieved 2013-03-29.
- Alexandersen, M.; Gladman, B.; Greenstreet, S.; Kavelaars, J. J.; Petit, J. -M.; Gwyn, S. (2013). "A Uranian Trojan and the Frequency of Temporary Giant-Planet Co-Orbitals". Science 341 (6149): 994–997. arXiv:1303.5774. doi:10.1126/science.1238072. PMID 23990557.
- Choi, C. Q. (2013-08-29). "First 'Trojan' Asteroid Companion of Uranus Found". Space.com web site. TechMediaNetwork. Retrieved 2013-09-03.
- Alexandersen, M.; Kavelaars, J.; Petit, J.; Gladman, B. (18 March 2013). MPEC 2013-F19: 2011 QF99. IAU. Retrieved 3 September 2013.
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