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Sycorax (moon)
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Sycorax (moon) : ウィキペディア英語版
Sycorax (moon)

Sycorax ( ) is the largest retrograde irregular satellite of Uranus. Sycorax was discovered on 6 September 1997 by Brett J. Gladman, Philip D. Nicholson, Joseph A. Burns, and John J. Kavelaars using the 200-inch Hale telescope, together with Caliban, and given the temporary designation S/1997 U 2.
Officially confirmed as Uranus XVII, it was named after Sycorax, Caliban's mother in William Shakespeare's play ''The Tempest''.
== Orbit ==
Sycorax follows a distant orbit, more than 20 times further from Uranus than the furthest regular moon, Oberon. Its orbit is retrograde, moderately inclined and eccentric. The orbital parameters suggest that it may belong, together with Setebos and Prospero, to the same dynamic cluster, suggesting common origin.
The diagram illustrates the orbital parameters of the retrograde irregular satellites of Uranus (in polar co-ordinates) with the eccentricity of the orbits represented by the segments extending from the pericentre to the apocentre.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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