Neptune


WELCOME TO NEPTUNE


Mass (kg)............................................ 1.02 x 10^26
Diameter............................................. 30,700 mi.(49528 km.)
Mean density (kg/m^3) ............................... 1640
Escape velocity (m/sec).............................. 23,300


Distance from the sun ............................... Shortest-2,774,800,000 mi.(4,465,600,000 km.)
					                      Greatest-2,824,000,000 mi.(4,546,100,000 km.)
			      		                      Mean-2,798,800,000 mi.(4,504,300,000 km.)
Rotation period (length of day in Earth hours)....... 19.1
Revolution period (length of year in Earth years).... 164.8


Obliquity (tilt of axis in degrees).................. 29.6
Orbit inclination (degrees).......................... 1.77
Orbit eccentricity (deviation from circular)......... 0.009


Mean surface temperature(Fahrenheit) ................ -353 F


Visual geometric albedo (reflectivity)............... 0.51
Atmospheric components............................... 74% hydrogen, 
                                                      25% helium,
                                                       1% methane (at depth)
Rings................................................ Rings are 
                           narrow, and contain concentrations of 
			   particles called ring arcs


Number of Satellites ................................ 8



Interesting Facts about this Planet

  • Neptune was discovered in 1846
  • There is a Great Dark Spot on Neptune, a storm system as large as the Earth, spinning round once every sixteen days made of frozen methane.
  • Neptune's axis is tilted at 28 degrees.
  • Neptune has no solid surface
  • Neptune may have a sm;all core of molten rock at its very center.
  • The center of Neptune is extremely hot: its temperature 7,000 C
  • Neptune's largest moon is Triton, the coldest in the solar system
  • Neptune has a thick atmosphere composed of hydrogen, helium, methane, and ammonia, and a relatively low density
  • Johann Galle discovered Neptune on Sept. 23, 1846



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Copyright 1996