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Neptune
Proper Name
  Neptune
Sidereal Period
  164.90 years
Mean Distance from the Sun
  4,504.5 million km
  30.11 AU
Sidereal Day
  18 hours, 12 minutes
Diameter
  50,538 km
Mean Surface Temperature
  -193°C
Moons
  Despoina
  Galatea
  Larissa
  Naiad
  Nereid
  Proteus
  Thalassa
  Triton
  Other small moons
Because Pluto pursues an eccentric orbit in comparison with the other worlds of the solar system, Neptune is periodically the farthest planet from the Sun. This gas giant follows its course on the outer fringes of the Solar System.

Neptune
The cold, blue world of Neptune, outermost of the gas giants. Surface map courtesy Jet Propulsion Laboratory. Copyright (c) California Institute of Technology, Pasadena, CA. All rights reserved.
Size Comparison of Neptune
With a diameter of 49,500km, Neptune is the smallest of the Jovian planets. In comparison to our own Earth, though, it is gigantic. Surface map courtesy Jet Propulsion Laboratory. Copyright (c) California Institute of Technology, Pasadena, CA. All rights reserved.
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  • For Neptune's current position, see the Planet Wheel