Sycorax

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Sycorax
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. 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. It is hypothesized that Sycorax is a captured object; it did not form in the accretion disk which existed around Uranus just after its formation. Sycorax (moon) - Wikipedia, the free encyclopedia
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Short Description 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. 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. It is hypothesized that Sycorax is a captured object; it did not form in the accretion disk which existed around Uranus just after its formation. Sycorax (moon) - Wikipedia, the free encyclopedia
Discovered by Philip D. Nicholson, Brett J. Gladman, Joseph A. Burns, John J. Kavelaars using the Hale telescope
Discovery date September 6, 1997
Type Moon
AddInfo Uranus XVII
Satellite of Uranus
Orbit Retrograde
Rotation Direct
Apoapsis 08 18 393 380 km
Periapsis 07 5 957 740 km
Semi-major axis 08 12 175 560 km
Distance from Sun 02 19.218 4 au /23
Eccentricity 0.522 4
Orbital period 1 288.28 days
Orbital speed  0.69 km/s
Inclination to the ecliptic 159°
Diameter/Size 03 150 km
Mass 1018×2.5 kg
Density 01 1.3 g/cm3
Surface gravity  0.040 m/s2
Rotation period 3.6 hour
Albedo geometric 0.049
Temperature mean 02 65 K
Apparent magnitude 20.8
Absolute magnitude 7.83
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