Sycorax
The largest of Uranus's captured retrograde moons.
Where it is right now
Sycorax is in Taurus, 19.9 AU away.
Computed for 2 August 2026, 20:00 UTC, and recomputed at least hourly. This page is cached, so treat the line above as accurate to the hour rather than to the second. The map shows the live position.
Position from a Kepler propagation of the published elements below, accurate to about an arcminute.
Facts
Every line carries the source it came from.
- Mean radius
- 78 kmSource: IAU/NASA planetary satellite fact sheets
- Orbits
- Uranus, 12,193,200 km out on averageSource: NASA/JPL Planetary Satellite Mean Elements
- Orbital period
- 3.5 yearsSource: NASA/JPL Planetary Satellite Mean Elements
- Orbit shape
- eccentricity 0.5200, inclined 157.00 degrees to the eclipticSource: NASA/JPL Planetary Satellite Mean Elements
- Discovered
- 1997 by P.D. Nicholson, B.J. Gladman, J.A. Burns, J.J. KavelaarsSource: NASA/JPL Planetary Satellite Discovery Circumstances
Physical size
- Mean radius
- 78.0 km
- Diameter
- 156 km across
Orbit
Elements are relative to Uranus.
- Average distance from Uranus
- 12.19 million km
- Closest and furthest
- 5.85 million km to 18.53 million km
- Eccentricity
- 0.5200, strongly elliptical
- Inclination to Uranus's reference plane
- 157.00 degrees
- Orbital period
- 3.5 years (1,286 days)
- Longitude of ascending node
- 267.10 degrees
- Argument of periapsis
- 25.40 degrees
- Mean anomaly at J2000.0
- 87.29 degrees
Family
Orbits Uranus.
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Catalog id sycorax. 3,172 objects on the map, of which 171 are hand-authored with sourced facts.