10422

Neptune

Distance from the Sun
(Semimajor axis of orbit)
4,498,252,900 km
30.06896348 A.U.

Mean Equatorial Radius
24,764 km
(3.883 of Earth's radius)

Volume (Earth = 1)
44

Mass
102.44 × 1027 g

Density
1.76 gm/cm3

Gravity
1100 cm/s2

Escape Velocity
23.71 km/s

Sidereal Rotation Period (Earth days)
0.67125

Sidereal Orbit Period
164.79132 sidereal years

Mean Orbit Velocity
5.4778 km/s

Orbit Eccentricity
0.00858587

Orbit Inclination to Ecliptic
1.76917 degrees

Inclination of Equator to Orbit
29.58 degrees

Atmospheric Temperature (at level with pressure = 1 bar)
73 K

Major Atmospheric Constituents
H2, He, CH4

Natural Satellites
(approximately 11 - see NASA website for complete list)