A Uranus trojan is an asteroid that shares an orbit with Uranus and the Sun. Two trojans have been discovered in Uranus’s Lagrangian point L4, where they follow 60° ahead and trail 60°.

2011 QF99 was the first body to be classified as such a trojan in 2013, while in 2017 2014 YX49 became the second.[1]

Several theories have come to be on how such trojans could orbit Uranus. Gravitational scattering is the most popular, stating that such asteroids (or comets) could have been gravitationally pulled by the other planets, leading them on a perfect trajectory towards Uranus, or somewhere where Uranus’s gravitational pull is neutral.

List of Uranus trojans[2]
Designation Cloud Semimajor axis
(AU) 		Perihelion
(AU) 		Eccentricity Inclination
(°) 		(H) Diameter
(M)
2011 QF99 L4 19.167 15.765 0.177 10.796 9.6 60
2014 YX49 L4 19.113 13.762 0.279 25.524 8.79 77

References

  1. ^ de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (21 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.
  2. ^ "Small-Body Database Lookup". ssd.jpl.nasa.gov. Retrieved 2024-03-28.
source: http://en.wikipedia.org/wiki/Uranus_trojan