Ariel was discovered in 1951 & Same with Umbriel
Ariel and Umbriel were discovered by William Lassell in October 1851.
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William Lassell discovered the moons Ariel and Umbriel orbiting Uranus in 1851.
William Lassel discovered them in 1851.
William Lassell discovered them on October 24, 1851.
1851 by William Lassell (Ariel and Umbriel) and in 1948 by Gerard Kuiper (Miranda)Titania and Oberon were discovered in 1787by William Herschel.
Uranus's moon Ariel was discovered in 1851. The moon was discovered along with Umbriel, another moon of the planet, by William Lassell.
Umbriel is Uranus's moon.
William Herschel discovered Titania and Oberon in 1787. William Lassell discovered Ariel and Umbriel in 1851. Gerard Kuiper discovered Miranda in 1948.
Miranda was discovered by Gerard P. Kuiper in 1948 .Ariel and Umbriel were discovered by William Lassel in 1851. Titania and Oberon were discovered by William Hershel in 1787.
the temperature of Umbriel is about 61 degres C