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2011 QF99
is the first and, as of 2015, the only known Uranus trojan.〔〔 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.〔
temporarily orbits near Uranus's Langrangian point (leading Uranus). It will continue to librate around for at least 70,000 years and will remain a Uranus co-orbital for up to three million years before becoming a centaur. 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 led to the conclusion that at any given time, 0.4% of the centaurs in the scattered population within 34 AU would be Uranus co-orbitals, of which 64% (0.256% of all centaurs) would be in horseshoe orbits, 10% (0.04%) would be quasi-satellites, and 26% (0.104%) would be trojans (evenly split between the and groups).〔
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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