	Mercure
	Vénus
	Terre
	Mars
	Ceres *
	Jupiter
	Saturne
	Uranus
	Neptune
	Pluto *
	Haumea *
	Makemake *
	Eris *
	Sedna *
	* = Planète naine

Neptune

Caractéristiques orbitales

Périhélie: 4,452,940,833 km, 29.76607095 AE
Aphélie: 4,553,946,490 km, 30.44125206 AE
Demi-grand axe: 4,503,443,661 km, 30.10366151 AE
Excentricité: 0.011214269
Période de révolution: 60,190 jours, 164.79 années
Période synodique: 367.49 jours
Vitesse orbitale moyenne: 5.43 km/s
Anomalie moyenne: 267.767281°
Inclinaison: 1.767975°
Longitude du nœud ascendant: 131.794310°
Argument du périhélie: 265.646853°

Satellites/Lunes: 13 (Naiad, Thalassa, Despina, Galatea, Larissa, Proteus, Triton, Nereid, Halimede, Sao, Laomedeia, Psamathe, Neso)

Caractéristiques physiques

Rayon équatorial: 24,764 km (3.883 x Terre)
Aplatissement: 0.0171 ± 0.0013
Superficie: 7.6408×10⁹ km² (14.98 x Terre)
Volume: 6.254×10¹³ km³ (57.74 x Terre)
Masse: 1.0243×10²⁶ kg (17.147 x Terre)
Masse volumique moyenne: 1.638 g/cm³
Gravité à la surface: 11.15 m/s²
Vitesse de libération: 23.5 km/s
Sidereal rotation period: 0.6713 day Earth days, 16 h 6 min 36 s Earth hours
Inclinaison de l’axe: 28.32°
Albédo moyen: 0.41
Température de surface: 59 K, -214 °C, -353 °F
Magnitude apparente: 8.0 to 7.78
Diamètre angulaire: 2.2″ - 2.4″

Atmosphère

Composition:

80±3.2% Molecular Hydrogen (H₂)

19±3.2% Helium

1.5±0.5% Methane (CH₄)

192 ppm Hydrogen Deuteride (HD)

1.5 ppm Ethane (C₂H₆)

Neptune images:

www.flickr.com

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