NEPTUNE

Discovery of Neptune

Facts about Neptune

Distance from the Sun:
Diameter:
Rotation period:
Revolution period:
Density (Water=1):
Mass:
Mass (Earth=1):
Volume (Earth=1):
Gravity (Earth=1):
Mean Temperature:
Geometric Albedo*:
Apparent Magnitude (Vo):
Axis Tilt:
Orbital Inclination:
Orbital Speed:
Equatorial Escape Veocitiy:
Moons:
Rings:
Atmosphere:
 2,790 million miles (30.06 AU)
30,800 miles (49,528 km)
17 hours, 50 minutes
164.8 years
1.64
1.02 x 10^26 kg
17.13
54
1.13
48 K (-405 F)
0.51
7.84
28.8 degrees
1.77 degrees
5.4 kmps (3.3 miles/sec)
23.3 kmps (14.4 miles/sec)
8
3
85% Hydrogen
13% Helium
2% Methane

* fraction of sunlight reflected

More Info about Neptune

Neptune's Moons and Rings

Links to other Neptune pages

Neptune [lanl.gov]

Neptune [NASA]

Neptune [Nine Planets]

NSSDC Photo Gallery: Neptune

RPIF- Neptune

Neptune's Ring System

Pictures

Mythology

In Roman mythology, Neptune was the older brother of Jupiter and the god of the sea (the planet Neptune got its name from the fact that when it was seen through a telescope, its disc appeared bluish-green in color). He is the Roman counterpart to the Greek god Poseidon. In mythology, Neptune is often depicted carrying a trident, a three-pronged spear which has become an alternate symbol for the planet Neptune. Naturally, he was the most important god to the ancient mariners and seafarers, and it is said that he first introduced the horse to man.

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