(687170) 2011 QF99

Uranus trojan February 2018 yes #C7FF8F (687170) 2011 QF 99 Animation of 2011 QF99 relative to Sun and Uranus 1600-2500.gif Animation of 2011 QF 99 relative to Sun and Uranus 1600–2500Magenta 2011 QF 99Lime Uranus Yellow Sun M. Alexandersen Mauna Kea Obs. 29 August 2011(first observation only) (687170) 2011 QF 99 Uranus trojancentaurdistant 4 September 2017 (JD 2458000.5) 3 3.97 yr (1,449 days) 22.422 AU 15.659 AU 19.040 AU 0.1776 83.08 yr (30,346 days) 283.84° 0.0119 ms / day 10.833° 222.52° 288.25° 60 km (calculated) 0.05 (assumed) 9.6 (R-band)9.7 (687170) 2011 QF 99 is a minor planet from the outer Solar System and the first known Uranus trojan to be discovered. It measures approximately 60 km mi off us 2 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 a Uranian trojan was not announced until 2013. 2011 QF 99 temporarily orbits near Uranus's Lagrangian point (leading Uranus). It will continue to librate around yes for at least 70,000 years and will remain a Uranus co-orbital for up to three million years. 2011 QF 99 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 yes and yes groups). A second Uranian trojan, (636872) 2014 YX 49, was announced in 2017. References 2012-10-21 last obs. JPL Small-Body Database Browser: (2011 QF99) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3632683 Jet Propulsion Laboratory 12 October 2017 2011 QF99 Minor Planet Center http://www.minorplanetcenter.net/db_search/show_object?object_id=2011+QF99 12 October 2017 Alexandersen M. Gladman B. Greenstreet S. Kavelaars J. J. Petit J. -M. Gwyn S. 10.1126/science.1238072 A Uranian Trojan and the Frequency of Temporary Giant-Planet Co-Orbitals Science 341 6149 994–997 2013 23990557 1303.5774 2013Sci...341..994A 39044607 Choi C. Q. First 'Trojan' Asteroid Companion of Uranus Found Space.com web site TechMediaNetwork 2013-08-29 http://www.space.com/22590-uranus-trojan-asteroid-discovery.html 2013-09-03 Alexandersen M. Kavelaars J. Petit J. Gladman B. MPEC 2013-F19: 2011 QF99 18 March 2013 http://www.minorplanetcenter.net/mpec/K13/K13F19.html IAU 3 September 2013 Minor Planet Electronic Circulars 2013-F19 2013MPEC....F...19A de la Fuente Marcos Raúl de la Fuente Marcos Carlos Comparative orbital evolution of transient Uranian co-orbitals: exploring the role of ephemeral multibody mean motion resonances Monthly Notices of the Royal Astronomical Society 22 May 2014 441 3 1404.2898 10.1093/mnras/stu733 2280–2295 free 2014MNRAS.441.2280D de la Fuente Marcos Raúl de la Fuente Marcos Carlos Asteroid 2014 YX49: a large transient Trojan of Uranus Monthly Notices of the Royal Astronomical Society 15 May 2017 467 2 1701.05541 10.1093/mnras/stx197 1561–1568 free 2017MNRAS.467.1561D External links 687170 (687170) 2011 QF 99 Category:Trojan minor planets Category:Uranus co-orbital minor planets 20110829