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Neptune
Orbit data - Object data - Atmosphere - Mythology - Satellites - Ring system - Links Go to the bottom of the page
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Photo of the planet Neptune
Neptune

Hide this area Orbit data
Mean distance from the star Sun 4.495.060.000 km
30,0689 AU
Minimum distance from the star Sun (perihelion) 4.444.450.000 km
Maximum distance from the star Sun (aphelion) 4.545.670.000 km
Orbital period around the star Sun (sideric) 164,79132 y
Orbital period around the star Sun (synodic) 367,49 d
Mean orbital velocity 5,43 km/s
Orbital inclination 1,7692 °
Eccentricity of the orbit around the star Sun 0,0086
Hide this area Object data
Discovered by Johann Gottfried Galle 1846
Mass 1,0243 × 1026 kg
Equatorial radius 24.764 km
Oblateness 0,0171
Mean density 1,638 g/cm³
Escape velocity 23,5 km/s
Surface force of gravity 11,00 m/s²
Tilt of axis 28,32 °
Rotational period 16,11 h
Equatorial rotational velocity 9667,1 km/h
Mean surface temperature 72 K
Minimum surface temperature 55 K
Albedo 0,41
Apparent magnitude + 7,78 mvis
Hide this area Atmosphere
80,0 %   Hydrogen (H2)
18,0 %   Helium (He)
1,5 %   Methane (CH4)
  Ethane (C2H6)
  Ammonia (NH3)
Hide this area Mythology

The greek god Poseidon is a son of Cronus and Rhea. Poseidon is the ruler of the sea. The roman god Neptune is identical to the greek god Poseidon.

Poseidon became the ruler of the sea as the power of the world got divided. The symbols of Poseidon are tridents and dolphins. Poseidon also has the powers of earthquakes.

 Symbol of mythology for Neptune
Hide this area Satellites
No.  Name Distance Eccentricity Radius Mass
1 I  Triton Triton 354760 354.760 km 0.0000 0,0000 1353.4 1353,4 km 22.2147 2,147 × 1022 kg
2 II  Nereid Nereid 5513400 5.513.400 km 0.7512 0,7512 170 170 km 19.31 3,1 × 1019 kg
3 III  Naiad Naiad 48227 48.227 km 0.0003 0,0003 33 33 km 17.13 1,3 × 1017 kg
4 IV  Thalassa Thalassa 50075 50.075 km 0.0002 0,0002 41 41 km 17.35 3,5 × 1017 kg
5 V  Despina Despina 52526 52.526 km 0.0001 0,0001 75 75 km 18.23 2,3 × 1018 kg
6 VI  Galatea Galatea 61953 61.953 km 0.0001 0,0001 88 88 km 18.27 2,7 × 1018 kg
7 VII  Larissa Larissa 73548 73.548 km 0.0014 0,0014 104 104 × 89 km 18.48 4,8 × 1018 kg
8 VIII  Proteus Proteus 117647 117.647 km 0.0004 0,0004 218 218 × 208 × 201 km 19.49 4,9 × 1019 kg
9 X  Psamathe Psamathe 46695000 46.695.000 km 0.450 0,450 14 14 km 16.15 1,5 × 1016 kg
Hide this area Ring system
Name Distance Width Thickness Mass Albedo
Galle Galle 41900 41.900 km 2000 2.000 km 0.015 0,015
LeVerrier LeVerrier 53200 53.200 km 110 110 km 0.015 0,015
Lassell Lassell 53200 53.200 km 4000 4.000 km 0.015 0,015
Arago Arago 57200 57.200 km 100 < 100 km
Adams Adams 62933 62.933 km 50 50 km 0.015 0,015
Hide this area Links
File icon Gustav Holst: The Planets - Neptune: The Mystic (133 kB)
 
File icon NASA Spacelink - Solar System Lithograph Set - Our Solar System
Lithograph number LG-2001-08-02-HQ (~ 3400 kB)
File icon NASA (Voyager 2) - Neptune
© Calvin J. Hamilton ("Views of the Solar System")
File icon NASA/JPL (Voyager 2) - Neptune - True Color of Clouds
© Calvin J. Hamilton ("Views of the Solar System")
File icon NASA (Voyager 2) - Parting Look
© Calvin J. Hamilton ("Views of the Solar System")
File icon Welcome to the Planets
Online version of the "Planetary Data System Educational CD-ROM"
File icon A Multimedia Tour of the Solar System - The Nine Planets
© William A. Arnett
© 2013 by Bernd Onasch - Imprint Go to the top of the page
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