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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 ]
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]
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).
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]
Parts-per-million chart of the relative mass distribution of the Solar System, each cubelet denoting 2 × 10 24 kg. This article includes a list of the most massive known objects of the Solar System and partial lists of smaller objects by observed mean radius. These lists can be sorted according to an object's radius and mass and, for the most ...
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.
S/2023 U 1 has an average orbital eccentricity of 0.25 and an average inclination of 144° with respect to the ecliptic, or the plane of Earth's orbit. [3] Since S/2023 U 1's orbital inclination is greater than 90°, the moon has a retrograde orbit, meaning it orbits in the opposite direction of Uranus' orbit around the Sun. [5] Due to ...
The following outline is provided as an overview of and topical guide to Uranus: . Uranus – seventh planet from the Sun.It has the third-largest planetary radius and fourth-largest planetary mass in the Solar System.