An outer retrograde satellite of Uranus, at a distance of 17 420 400 km; also known as Uranus XIX. It orbits every 2225.1 days at an inclination of 158°.2 to the ecliptic. The orbit is one of the most elliptical of any moon in the Solar System, eccentricity 0.59. Setebos is 48 km in diameter and was discovered in 1999 from ground-based observations.