Distance From Sun (km) 4,500million Distance from Earth (10^6 km) Minimum 4305.9 Maximum 4687.3 Length of Year 165 years Length of Day 16 hours Diameter 50,000 km Average Temperature -220oC at cloudtop Atmosphere Methane, Hydrogen, Helium Number of moons 8 Year discovered 1846 Number of rings 5 Mass (10^26 kg) 1.02 Surface pressure 100 bars Wind Speed Up To 2400 km/h