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Neptune
NeptuneSol 8
Neptune
Distance
from the Sun
  mil km4,504.3
  mil miles2793
Orbital Period
(length of year)
  Earth days60,190
  Earth years 164.795
Local Days per Year  
rotations per orbit  
90,097.3
Length of day  
in Earth Time  
16h 2m
Axial Tilt   28.31
Orbital Inclination  
from Earth's orbit  
1.774
Orbital Eccentricity  
from circular  
0.0097
Sidereal Rotation  
in Earth days  
0.67125
Mean Orbital Velocity km/s   5.44
Visual Geometric Albedo .41
Vo or Object's Visible
Magnitude at Opposition
7.84
Mean Radius km     24,746
Mean  
Diameter  

at Equator  
  km49,530
  miles30,198
  x Earth 3.81
Mass   kg 1.27 e+22
  x Earth17
Density (grams per cm3)   1.64
Gravity x Earth   1.19
Escape Velocity in km per sec   23.5
Neptune, the god of the Sea. The eighth planet out from the sun is a veritable twin of the next closest planet, Uranus. The main Neptunian moon is Triton, which has an extremely thin atmosphere: 15 microbars of nitrogen ice.



Triton


The Solar System
The Sun Mercury Venus Earth Mars
The Asteroid Belt Jupiter Saturn Uranus Neptune Pluto