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As of 2025, Uranus is known to have 13 inner moons, whose orbits all lie inside that of Miranda. [12] The inner moons are classified into two groups based on similar orbital distances: these are the Portia group, which includes the six moons Bianca , Cressida , Desdemona , Juliet , Portia , and Rosalind ; and the Belinda group, which includes ...
Miranda, also designated Uranus V, is the smallest and innermost of Uranus's five round satellites. It was discovered by Gerard Kuiper on 16 February 1948 at McDonald Observatory in Texas, and named after Miranda from William Shakespeare's play The Tempest. [9] Like the other large moons of Uranus, Miranda orbits close to its planet's ...
Ariel is the fourth-largest moon of Uranus. Ariel orbits and rotates in the equatorial plane of Uranus, which is almost perpendicular to the orbit of Uranus, so the moon has an extreme seasonal cycle. It was discovered on 24 October 1851 [11] by William Lassell and named for a character in two different pieces of literature.
Uranus's 28 natural satellites include 18 known regular moons, of which 13 are small inner moons. Further out are the larger five major moons of the planet: Miranda, Ariel, Umbriel, Titania, and Oberon. Orbiting at a much greater distance from Uranus are the ten known irregular moons.
Titania orbits Uranus at the distance of about 436,000 kilometres (271,000 mi), being the second farthest from the planet among its five major moons after Oberon. [ g ] Titania's orbit has a small eccentricity and is inclined very little relative to the equator of Uranus. [ 4 ]
Astronomers have discovered a new moon orbiting Uranus — the first spotted in nearly 20 years — and two new moons around Neptune. ... By studying the distant, angular orbits of the moons ...
A moon that orbits its object in the same direction as that object's rotation. Retrograde. ... more eccentric orbit may have generated strong tidal forces as it swept close to Uranus. This tidal ...
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).