Neptune Data



Average distance from the Sun 30.0611 AU (44.52 x 108 km)
Eccentricity of orbit 0.0100
Maximum distance from the Sun 30.4 AU (45.4 x 108 km)
Minimum distance from the Sun 29.8 AU (44.52 x 108 km)
Inclination of orbit to ecliptic 1 46' 27''
Average orbital velocity 5.43 km/sec
Orbital period 164.793 y (60,189 days)
Period of rotation 16h 3m
Inclination of equator to orbit 28 48'
Equatorial diameter 49,500 km
Mass 1.030 x 1026 kg
Average density 1660 kg/m3
Gravity 1.19 earth gravities
Escape velocity 25 km/sec
Temperature at cloud tops 55 K (-360 F)
Atmospheric Pressure 1-3 bars
Atmospheric Composition 85% Hydrogen
13% Helium
2% Methane
Albedo 0.35
Oblateness 0.027