10. Triton

10. Triton

Courtesy of NASA/JPL/Space Science Institute

http://photojournal.jpl.nasa.gov/catalog/pia01536


Moon of Neptune

Diameter: 2,700 km
Orbit Radius: 354,760 km
Orbital Period: -5.9 days (retrograde)
Rotational Period: -5.9 days (retrograde)
Average Temperature: -235°C
Composition: Rocky/Icy
Atmosphere: N2; CH4
Atmospheric Pressure: 0.00001 bars
Gravity (Earth=1): 0.8
Mass (Earth=1): 0.0036
Magnetic Field: Unknown