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(Redirected from 2011 QF99) Uranus trojan

(687170) 2011 QF₉₉
Discovery
Animation of 2011 QF99 relative to Sun and Uranus 1600-2500 2011 QF99 · Uranus · Sun
Discovered by	M. Alexandersen
Discovery site	Mauna Kea Obs.
Discovery date	29 August 2011 (first observation only)
Designations
MPC designation	2011 QF₉₉
Minor planet category	Uranus trojan centaur · distant
Orbital characteristics
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 3
Observation arc	3.97 yr (1,449 days)
Aphelion	22.422 AU
Perihelion	15.659 AU
Semi-major axis	19.040 AU
Eccentricity	0.1776
Orbital period (sidereal)	83.08 yr (30,346 days)
Mean anomaly	283.84°
Mean motion	0° 0 42.84 / day
Inclination	10.833°
Longitude of ascending node	222.52°
Argument of perihelion	288.25°
Physical characteristics
Mean diameter	60 km (calculated)
Geometric albedo	0.05 (assumed)
Absolute magnitude (H)	9.6 (R-band) 9.7

(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. 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.

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.

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). A second Uranian Trojan, 2014 YX49, was announced in 2017.

References

^ "2011 QF99". Minor Planet Center. Retrieved 12 October 2017.
^ "JPL Small-Body Database Browser: (2011 QF99)" (2012-10-21 last obs.). Jet Propulsion Laboratory. Retrieved 12 October 2017.
^ 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. Bibcode:2013Sci...341..994A. doi:10.1126/science.1238072. PMID 23990557. S2CID 39044607.
Choi, C. Q. (29 August 2013). "First 'Trojan' Asteroid Companion of Uranus Found". Space.com web site. TechMediaNetwork. Retrieved 3 September 2013.
Alexandersen, M.; Kavelaars, J.; Petit, J.; Gladman, B. (18 March 2013). "MPEC 2013-F19: 2011 QF99". Minor Planet Electronic Circulars. 2013-F19. IAU. Bibcode:2013MPEC....F...19A. Retrieved 3 September 2013.
de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (22 May 2014). "Comparative orbital evolution of transient Uranian co-orbitals: exploring the role of ephemeral multibody mean motion resonances". Monthly Notices of the Royal Astronomical Society. 441 (3): 2280–2295. arXiv:1404.2898. Bibcode:2014MNRAS.441.2280D. doi:10.1093/mnras/stu733.
de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (15 May 2017). "Asteroid 2014 YX₄₉: a large transient Trojan of Uranus". Monthly Notices of the Royal Astronomical Society. 467 (2): 1561–1568. arXiv:1701.05541. Bibcode:2017MNRAS.467.1561D. doi:10.1093/mnras/stx197.

External links

(687170) 2011 QF99 at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

Uranus

Outline

Geography

Major moons

Astronomy

Discovery	William Herschel Gerard Kuiper James L. Elliot William Lassell
General	Uranus-crossing minor planets
Co-orbitals	Trojans 2011 QF₉₉ 2014 YX₄₉ 83982 Crantor (472651) 2015 DB216

Exploration

Past	Voyager 2 (1986 flyby)
Future	Tianwen-4 (2029, flyby 2045)
Proposals	MUSE OCEANUS ODINUS Uranus Orbiter and Probe Uranus Pathfinder

Fiction

v t e Minor planets navigator
(687170) 2011 QF₉₉

Small Solar System bodies

Minor planets

Designation Groups List Moon Meanings of names
Asteroid	Active Aten asteroid Asteroid belt Family Jupiter trojan Near-Earth Spectral types
Distant minor planet	Centaur Neptune trojan Damocloid Trans-Neptunian object Detached Kuiper belt Oort cloud Scattered disc

Comets

Other

v t e 2011 in space
2012 »
Space probe launches	Juno (Jupiter orbiter; Aug 2011) GRAIL (mission to the Moon; Sep 2011) Yinghuo-1 (Mars orbiter); Nov 2011) Mars Science Laboratory / Curiosity rover (mission to Mars; Nov 2011) Fobos-Grunt (mission to Mars; Nov 2011)
Selected NEOs	Asteroid close approaches (367789) 2011 AG5 (471240) 2011 BT15 2011 CQ1 2011 ES4 2011 EO40 2011 GA 2009 BD 2011 MD (415029) 2011 UL21 (436724) 2011 UW158 (308635) 2005 YU55 (549948) 2011 WL2 2011 XC2
Exoplanets	82 G. Eridani b c d Gliese 433 b habitability of Gliese 581d Gliese 3634 b HAT-P-32b HAT-P-33b HD 1502 b HD 7199 b HD 30856 b HD 82886 b HD 85512 b HD 96063 b HD 98219 b HD 100655 b HD 131496 b HD 137388 b HIP 57274 b c d HR 7722 c Kepler-9d Kepler-10 b c Kepler-11 b c d e f g Kepler-14b Kepler-16b Kepler-18 b c d Kepler-20 b c d e f Kepler-22b Kepler-39b Kepler-70 b c LkCa 15 b MOA-2009-BLG-387Lb PSR J1719−1438 b WASP-39b WASP-43b WASP-44b
Discoveries	UDFj-39546284 Swift J1644+57 Kronberger 61 WD 0806−661 ULAS J1120+0641 Kerberos (moon) PSR J1719−1438 Uranus trojan 2011 QF99 U1.11 SDSS J102915+172927 2 moons of Jupiter GRB 111209A
Novae	SN 2010lt SN 2011by SN 2011dh SN 2011fe
Comets	P/2011 NO₁ (Elenin) 45P/Honda–Mrkos–Pajdušáková C/2011 W3 (Lovejoy)
Space exploration	MESSENGER (Mercury orbital insertion; Apr 2011) Spirit (end of mission; Mar 2010 / May 2011) Dawn (Vesta orbital insertion; Jul 2011)
Outer space portal Category:2010 in outer space — Category:2011 in outer space — Category:2012 in outer space

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