4. Neptune

4. Neptune

Courtesy of NASA/JPL

http://photojournal.jpl.nasa.gov/catalog/pia01492


Planet

Diameter: 49,244 km
Orbit Radius: 29.97 AU
Orbital Period : 164.79 years
Rotational Period: 16.1 hours
Average Temperature: -214°C
Max/Min Temperature: Unknown
Composition: Icy
Number of Moons: 13
Rings: Yes
Atmosphere: 80% H2; 19% He; 1.5% CH4
Atmoshperic Pressure: Unknown
Gravity (Earth=1): 1.14
Mass (Earth=1): 17.15
Magnetic Field: Yes