(687170) 2011 QF₉₉ is a minor planet from the outer Solar System and the first known Uranus trojan to be discovered. It measures approximately 60 kilometers (37 miles) in diameter, assuming an albedo of 0.05.^[3][4] 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.^[3][5]

2011 QF₉₉ temporarily orbits near Uranus's L₄ Lagrangian 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. 2011 QF₉₉ is thus a temporary Uranus trojan—a centaur captured some time ago.^[3][6]

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 L₄ and L₅ groups).^[3] A second Uranian Trojan, 2014 YX49, was announced in 2017.^[7]