Moon of Neptune
Diameter: 277 km
Distance: 354800 km (mean)
Period: 5.877 days
Eccentricity: 0.000016
Inclination: 156.83°
Magnitude: 13.5

Discovered in 1846, Triton is Neptune's largest moon in a retrograde orbit. Triton has a sparsely cratered surface with smooth volcanic plains, mounds and round pits formed by icy lava flows. Triton's thin atmosphere is composed mainly of nitrogen with small amounts of methane.