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© USGS Astrogeology Research Program

Radius: 24,622 km
Mass: 1.02x1026 kg
Orbital Period: 164.79 Earth years
Rotation Period: 0.67 Earth day
Distance from Sun: 4,497.07 million km
Satellites: Triton, and smaller moons Naiad, Thalassa, Despina, Galatea, Larissa, Proteus, and Nereid.

Neptune is the eighth planet from the Sun. It has one prominent moon, Triton, and a number of smaller moons: Naiad, Thalassa, Despina, Galatea, Larissa, Proteus, and Nereid.

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Neptune is the eighth planet from Sun:

Distance from sun (million km): 4.509
Revolution: 164,49
Diameter (equator): 48.600 km
Period of rotation: 16 h, 3 min

Neptune has a mantle of liquid hydrogen while the atmosphere is a combination of ammonia, helium, and methane. Neptune has large, dark ovals on its surface which astronomers believe are hurricane-like storms.

Neptune generates more heat than it absorbs from the Sun, indicating it has its own internal heat source. It also has a ring system consisting of four rings.

Neptune has eight moons; four of which orbit within the rings. The largest satellite is called Triton.

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d'Arrest, Heinrich Louis
Galle, Johann Gottfried
Moon (General)
Triton
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