⇑
named after the Roman god of the seas symbol for the planet is: 

  • named after the Roman god of the seas
  • symbol for the planet is:


     

Neptune existence was predicted in 1846 by J.C. Adams and Le Verrier J.G. Galle and d’Arrest then observed Neptune in September, 1846 Not much was known about this planet until the Voyager 2 visit in August, 1989 

  • Neptune existence was predicted in 1846 by J.C. Adams and Le Verrier
  • J.G. Galle and d’Arrest then observed Neptune in September, 1846

  • Not much was known about this planet until the Voyager 2 visit in August, 1989 

Neptune’s thirteen moons:

  • Galatea (1989)
  • Triton (1846)
  • Proteus (1989)
  • Naiad (1989)
  • Thalassa (1989)
  • Larissa (1989)
  • Despina (1989)
  • Nereid (1949)
  • S/2002 N1
  • S/2002 N2
  • S2002 N3 
  • S/2002 N4
  • S/2003 N1

Neptune’s atmosphere is made completely of the gases hydrogen, helium, and methane. The methane is what gives Neptune it’s blue look, for it absorbs red light.  

  • Neptune’s atmosphere is made completely of the gases hydrogen, helium, and methane.
  • The methane is what gives Neptune it’s blue look, for it absorbs red light.  

gravitational field strength is around 11.2 N/kg A person of 100 lbs on Earth would weigh 112 lbs on Neptune.  

  • gravitational field strength is around 11.2 N/kg

  • A person of 100 lbs on Earth would weigh 112 lbs on Neptune.  

temperature can be as low as -218 degrees Celsius  -360.4 degrees Farenheit

  • temperature can be as low as -218 degrees Celsius

  •  -360.4 degrees Farenheit

It takes about 165 years for Neptune to completely orbit the sun.

  • eccentricity of 0.0097

  • each day is roughly 20 hours

  • Neptune’s 30 degree axis tilt causes each season to be 40 years long.

  • the poles are either in complete sunlight or darkness for 40 years.

Neptune is roughly 30.06 AU from the sun.  30x further than Earth

Neptune is roughly 30.06 AU from the sun. 

  • 30x further than Earth

Neptune’s mass is 1.0244x10^26 kilograms(102,440,000,000,000,000,000,000,000 kg)

  • 17 times the mass of the Earth’s 5.98x10^24 kg
    (would take over 17 Earths to equal Neptune) 

  • has a density of 1.638 grams per cubic centimeters
    (Earth: 5.515 g/cm^3) 

  • fourth largest planet in our solar system 

Neptune has a diameter of about 49,528 kilometers; 36,772 kilometers more than the Earth’s diameter. Big enough to hold 60 Earths  

  • Neptune has a diameter of about 49,528 kilometers; 36,772 kilometers more than the Earth’s diameter.

  • Big enough to hold 60 Earths