Neptune - The 8th Planet
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Facts & Figures

The Planet Neptune as imaged by The Hubble Space Telescope

The planet Neptune was not discovered until after the advent of the telescope.

 

Facts & Figures
  • Brightness at Opposition (max) +7.66 (min) +7.70
  • Distance from Earth (max) 31.33 AU (min) 28.79 AU
  • Mass 1.024 x 1026kg  (17.135 x Earth)
  • Size 49572 km @ Equator  (3.886 x Earth)
  • Distance from Sun (max) 30.31 AU (min) 29.80 AU
  • Orbital Period 164.79 years
  • Temperature (min) -223C (max) increases with depth


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