|Orbit||30.10366151 AU from primary (Semi-major axis)|
|Diameter||49,528 ± 30 km (equatorial)|
|Day||siderial: 16 hours 6 minutes 36 seconds|
|Mean Temperature||72°K at 1 Bar level|
|Atmosphere||80±3.2% Hydrogen, 19±3.2% Helium, 1.5±0.5% Methane, ~0.019% Hydrogen deuteride, ~0.00015% Ethane|
Neptune, the eighth planet from the Sun and the fourth-largest and third most massive planet in the Solar System, was discovered by Urbain Le Verrier, John Couch Adams, and Johann Galle on September 23, 1846. It is named after the ancient Roman god of the sea.
Moons of Neptune
Neptune has fourteen known moons.
Triton would be considered a dwarf planet if it was in Solar orbit.
Proteus has been renamed Rura Penthe by its colonists, a group of "Klingon separatists" from the United Federation of Planets.