Uranus’ Moon Sycorax

Uranus’ moon Sycorax — Sycorax is a moon of Uranus. It was named after a witch living on an island in William Shakespeare’s play The Tempest.

Its orbital radius is approximately 12.2 million km from Uranus and is about 160 km in diameter, but this size estimate is based on the moon’s apparent brightness and the assumption that it has an albedo of about 0.07.

Its orbit is retrograde and highly inclined. Sycorax’s composition is probably a mixture of rock and ice, and its unusually red color suggests a historical link with the Kuiper belt; Sycorax is probably a captured Kuiper Belt object.

Sycorax was discovered on September 6 – September 7, 1997 by Brett Gladman, Phil Nicholson, Joseph Burns, and JJ Kavelaars using the 200-inch Hale telescope; they also discovered the moon Caliban at the same time.



Discovered by Brett Gladman
Discovered in 1997

Orbital characteristics

Semimajor axis 7.1106 km
Eccentricity 0.08
Orbital period 578d
Inclination 137.6 (retrograde)

Physical characteristics

Mean radius ~49 km
Mass 7.31017 kg
Mean density 1.5 g/cm3
Surface gravity 0.02 m/s2
Rotation period unknown
Axial tilt 98.723
Albedo 0.07



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