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Neptune Statistics |
Discovered by | Johann Gotfried Galle |
Date of discovery | September 23, 1846 |
Mass (kg) | 1.024e+26 |
Mass (Earth = 1) | 1.7135e+01 |
Equatorial radius (km) | 24,746 |
Equatorial radius (Earth = 1) | 3.8799e+00 |
Mean density (gm/cm^3) | 1.64 |
Mean distance from the Sun (km) | 4,504,300,000 |
Mean distance from the Sun (Earth = 1) | 30.0611 |
Rotational period (hours) | 16.11 |
Orbital period around sun(years) | 164.79 |
Mean orbital velocity (km/sec) | 5.45 |
Orbital eccentricity | 0.0097 |
Tilt of axis (degrees) | 28.31 |
Orbital inclination (degrees) | 1.774 |
Equatorial surface gravity (m/sec^2) | 11.0 |
Equatorial escape velocity (km/sec) | 23.50 |
Visual geometric albedo | 0.41 |
Magnitude (Vo) | 7.84 |
Mean cloud temperature | -193 to -153°C |
Atmospheric pressure (bars) | 1-3 |
Atmospheric composition |
Hydrogen 85% Helium 13% Methane 2% |