Distance From Sun
Perihelion 740,600,000 km
(460,200,000 mi)
Mean 778,400,000 km
(483,600,000 mi)
Aphelion 816,000,000 km
(507,000,000 mi)
Distance From Earth
Shortest 628,760,000 km
(390,700,000 mi)
Greatest 970,000,000 km
(600,000,000 mi)
Size
Mass (earth=1) 317.8
Radius (earth=1) 11.2
Mean density (water=1) 1.3
Orbit/Rotation
Rotation period
(about axis)
9.8 hours
Period of revolution about sun 11.86 years
Inclination of orbit
(degrees)
1.30
Eccentricity of orbit 0.05
Temperature
-125 to 17 C
(-193 to 63 F)
Number of Satellites
16
Atmosphere
Hydrogen, helium (also traces of methane, ammonia, carbon monoxide, ethane, acetylene, phosphine, and water vapor).