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Umbriel (/ ˈ ʌ m b r i ə l /) is the third-largest moon of Uranus. It was discovered on October 24, 1851, by William Lassell at the same time as neighboring moon Ariel . It was named after a character in Alexander Pope 's 1712 poem The Rape of the Lock .
The two innermost moons, Cordelia and Ophelia, are shepherds of Uranus's ε ring, whereas the small moon Mab is a source of Uranus's outermost μ ring. [12] There may be two additional small (2–7 km in radius) undiscovered shepherd moons located about 100 km exterior to Uranus's α and β rings .
The names of all four satellites of Uranus then known were suggested by Herschel's son John in 1852, at the request of William Lassell, [16] who had discovered the other two moons, Ariel and Umbriel, the year before. [17] It is uncertain if Herschel devised the names, or if Lassell did so and then sought Herschel's permission. [18]
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.
Surface features of Uranus' moons (2 C, ... Umbriel (moon) (4 P) Pages in category "Moons of Uranus" The following 24 pages are in this category, out of 24 total.
Umbriel is the third-largest moon of Uranus. It was discovered on October 24, 1851, by William Lassell. Named after a character in the 1712 poem The Rape of the Lock by Alexander Pope, Umbriel is composed mainly of ice with a substantial fraction of rock. It may be differentiated into a rocky core and an icy mantle. Its surface, the darkest ...
Pages in category "Umbriel" The following 4 pages are in this category, out of 4 total. This list may not reflect recent changes. ...
Oberon is the second-darkest large moon of Uranus after Umbriel. [9] Its surface shows a strong opposition surge: its reflectivity decreases from 31% at a phase angle of 0° (geometrical albedo) to 22% at an angle of about 1°. Oberon has a low Bond albedo of about 14%. [9]