Discoverer: Unknown
Spacecraft Encounter(s): Pioneer 11 (1979)
Voyager 1 & 2 (1980, 1981)
Cassini - Huygens (2004)
Mean distance from the Sun: 9.539 AU
1, 427,000,000 km /886,700,000 mi
Length of Year: 29.46 Earth years
Rotation Period: 10.66 hours
Mean Orbital Velocity: 9.64 km/s (6 mi/s)
Inclination of Axis: 26.73°
Diameter: 120,536 km (74,901 mi)
Number of observed satellites: more than 50
Comparisons With Earth:
Diameter: 9.4 x Earth's
Average Distance from the Sun: 9.5 x Earth's
Mass: 95 x Earth's
Density: 0.13 x Earth's
