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Oberon orbits Uranus at a distance of about 584,000 km, being the farthest from the planet among its five major moons. [e] Oberon's orbit has a small orbital eccentricity and inclination relative to the equator of Uranus. [4] Its orbital period is around 13.5 days, coincident with its rotational period.
Uranus has at least one horseshoe orbiter occupying the Sun–Uranus L 3 Lagrangian point—a gravitationally unstable region at 180° in its orbit, 83982 Crantor. [154] [155] Crantor moves inside Uranus's co-orbital region on a complex, temporary horseshoe orbit. 2010 EU 65 is also a promising Uranus horseshoe librator candidate. [155]
Semi-synchronous orbit: An orbit with an orbital period equal to half of the average rotational period of the body being orbited and in the same direction of rotation as that body. For Earth this means a period of just under 12 hours at an altitude of approximately 20,200 km (12,544.2 miles) if the orbit is circular. [16]
The orbits of the regular moons are nearly coplanar with Uranus's equator, which is tilted 97.77° to its orbit. Uranus's irregular moons have elliptical and strongly inclined (mostly retrograde) orbits at large distances from the planet. [3] William Herschel discovered the first two moons, Titania and Oberon, in 1787.
Mean radius. 235.8 ± 0.7 km (0.036 ... also designated Uranus V, ... It is the rounded moon that has the smallest orbit around a major planet. Its orbital period is ...
Umbriel orbits Uranus at the distance of about 266,000 km (165,000 mi), being the third farthest from the planet among its five major moons. [ e ] Umbriel's orbit has a small eccentricity and is inclined very little relative to the equator of Uranus. [ 2 ]
Mean orbit radius. 14,345,000 km [5] [6 ... Margaret stands out as the only prograde irregular satellite of Uranus. The diagram illustrates the orbital parameters of ...
The moons of the trans-Neptunian objects (other than Charon) have not been included, because they appear to follow the normal situation for TNOs rather than the moons of Saturn and Uranus, and become solid at a larger size (900–1000 km diameter, rather than 400 km as for the moons of Saturn and Uranus).