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| | Meaning | God of the Sea | | Position | 8 | | Discoverer | Johann Elert Bode | | Discovered | 1781 | | Length of Day ( hrs ) | 16.11 | | Distance from Sun ( 10^6Km ) | 4495.1 | | Volume (10^10 km3) | 6254 | | Equatorial Radius | 24764 | | Volumetric Mean Radius | 24624 | | Ellipticity | 0.01708 | | Mean Density | 1638 | | Surface Gravity | 11.15 | | Surface Acceleration | 11 | | Escape Velocity | 23.5 | | Orbit Period | 4495.06 | | Orbit Eccentricity | 0.0113 | | Average Temperature | -72K/-201C | | Surface Pressure | >1000bars | | Average Temperature | -72K/-201C | | Atmosphere | Molecular hydrogen (H2) - 80.0% (3.2%); Helium (He) - 19.0% (3.2%); Methane (CH4) 1.5% (0.5%)
| | Moon Count | 8 | | Moons | Despina
Galatea
Larissa
Naiad
Nereid
Proteus
S/2002 N1
S/2002 N2
S/2002 N3
S/2002 N4
S/2003 N1
Thalassa
Triton
| | Picture Copyright | N.A.S.A. |
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