Mass (kg)............................................ 5.69 x 10^26 Diameter ............................................ 74,898 mi.(120660 km.) Mean density (kg/m^3) ............................... 690 Escape velocity (m/sec).............................. 35600Distance from the sun................................ Shortest- 838,000,000 mi.(1,349,900,000 km.) Greatest-937,600,000 mi.(1,508,900,000 km.) Mean- 888,200,000 mi.(1,429,400,000 km.) Rotation period (length of day in Earth hours)....... 10.2 Revolution period (length of year in Earth years).... 29.46
Obliquity (tilt of axis in degrees).................. 26.7 Orbit inclination (degrees).......................... 2.49 Orbit eccentricity (deviation from circular)......... 0.056
Mean surface temperature(Fahrenheit)................. -288 (-178 C)
Visual geometric albedo (reflectivity)............... 0.46 Atmospheric components............................... 97% hydrogen, 3% helium, .05% methane Rings................................................ Rings are 270,000 km in diameter, but only a few hundred meters thick. Particles are centimeters to dekameters 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.
Number of Satellites........................18