2011 QF99

Asteroid is a minor planet from the outer Solar System and the first known Uranus trojan to be discovered. It measures approximately in diameter, assuming an albedo of 0.05. It was first observed 29 August 2011 during a deep survey of trans-Neptunian objects conducted with the Canada–France–Hawaii Telescope, but its identification as Uranian trojan was not announced until 2013.

temporarily orbits near Uranus's Lagrangian point (leading Uranus). It will continue to libration, librate around for at least 70,000 years and will remain a Uranus co-orbital configuration, co-orbital for up to three million years. 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). A second Uranian Trojan, , was announced in 2017.

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{{DEFAULTSORT:2011 QF99
Trojan minor planets
Uranus co-orbital minor planets
Minor planet object articles (unnumbered)
Astronomical objects discovered in 2011, 20110829