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William Lassell found Umbriel and Ariel, the third and fourth Uranian moons to be discovered.
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William Lassell
English merchant and astronomer (1799–1880)
William Lassell was an English merchant and astronomer. He is remembered for his improvements to the reflecting telescope and his ensuing discoveries of four planetary satellites.Source: Wikipedia (CC BY-SA)
Umbriel
Moon of Uranus
Umbriel 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. Umbriel consists mainly of ice with a substantial…Source: Wikipedia (CC BY-SA)
Ariel (moon)
Fourth-largest moon of 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.Source: Wikipedia (CC BY-SA)
Moons of Uranus
Natural satellites of the planet Uranus
Uranus, the seventh planet of the Solar System, has 28 confirmed moons. The 27 with names are named after characters that appear in, or are mentioned in, William Shakespeare's plays and Alexander Pope's poem The Rape of the Lock. Uranus's moons are divided into three groups:…Source: Wikipedia (CC BY-SA)