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Ariel is the fourth-largest moon orbiting the planet Uranus. It is notable for its heavily cratered surface and its role in helping scientists understand the composition and geological history of Uranus's moon system.
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Apparent magnitude 14.8 (R-band) Absolute magnitude (H) 1.45
Ariel is the fourth-largest moon of Uranus. Ariel orbits and rotates in Uranus's equatorial plane, which is almost perpendicular to the planet's orbit, giving the moon an extreme seasonal cycle.