Monday, January 16, 2006


Mass (kg): 5.69 x 1026
Diameter (km): 120660
Mean density (kg/m3): 690
Escape velocity (m/s): 35600
Average distance from Sun: 9.537 AU (1,426,725,400 km)
Rotation period (length of day in Earth days): 0.44 (10.2 Earth hours) Revolution period (length of year in Earth years): 29.46
Obliquity (tilt of axis degrees): 26.7
Orbit inclination (degrees:) 2.49
Orbit eccentricity (deviation from circular): 0.056
Mean temperature (K): 88 K (1 bar level) (-185 oC)
Satellites: 31

Visual geometric albedo: (reflectivity) 0.46
Atmospheric components: 97% hydrogen (H), 3% helium (He), .05% methane (CH4)
Rings: Rings are 270,000 km in diameter, but only a few hundred meters thick. Particles are centimeters to decameters in size and are ice (some may be covered with ice); there are traces of silicate and carbon minerals. There are four main ring groups and three more faint, narrow ring groups separated by gaps called divisions.


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