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The radius of the Uranian Hill sphere is approximately 73 million km. [3] The relative sizes of moons are indicated by the size of their symbols, and the Caliban group of Uranian moons is labeled. Data as of February 2024. Uranus's irregular moons range in size from 120 to 200 km to under 10 km . [43]
For the small outer irregular moons of Uranus, such as Sycorax, which were not discovered by the Voyager 2 flyby, even different NASA web pages, such as the National Space Science Data Center [6] and JPL Solar System Dynamics, [5] give somewhat contradictory size and albedo estimates depending on which research paper is being cited.
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).
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.
A new study from NASA recently announced that four of Uranus’s five biggest moons may have liquid water oceans beneath their surface.
It is also designated Uranus VI. [10] Other than its orbit, [4] size of 50 × 36 km, [5] and geometric albedo of 0.06, [7] virtually nothing is known about it. In the Voyager 2 images, Cordelia appears as an elongated object with its major axis pointing towards Uranus
The planet Uranus and its five biggest moons may not be the sterile worlds scientists have long thought. New study on moons of Uranus raises chance of life Skip to main content
It is intermediate in size between Portia (the second-largest inner moon) and Miranda (the smallest of the five major moons). Puck's orbit is located between the rings of Uranus and Miranda. Little is known about Puck aside from its orbit, [ 4 ] radius of about 81 km, [ 5 ] and geometric albedo in visible light of approximately 0.11.