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Neptune is the 8th planet from the sun and the 4th gas giant after Uranus, its "twin".

Neptune
Neptune Neptune symbol
Orbital characteristics
Aphelion

30.44 AU

Perihelion

29.77 AU

Semi-major axis

30.1 AU

Eccentricity

0.011214269

Orbital

164.79 years

Synodic period

367.49 days

Average orbital speed

5.43 km/s

Inclination

1.767975° to Ecliptic, 6.43° to Sun’s equator, 0.72° to Invariable plane

Longitude of ascending node

131.794310°

Argument of perihelion

265.646853°

Satellites

13

Physical characteristics
Flattening

0.0171

Surface area

14.98 Earths

Mass

17.147 Earths

Mean density

1.638 g/cm³

Equatorial surface gravity

1.14 G

Escape velocity

23.5 km/s

Sidereal rotation period

0.6713 days

Equatorial rotation velocity

2.68 km/s

Axial tilt

28.32°

North pole right ascension

299.3°

North pole declination

42.950°

Albedo

0.290

Surface temp.

55 to 72 K

Apparent magnitude
Angular diameter

2.2 to 2.4

Atmosphere
Surface pressure

0.1 to 1 Mbar

Compositions

hydrogen, helium, methane, ammonia, water

TriviaEdit

  • Neptune crosses orbits with Pluto once in awhile.

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