Neptune  

Neptune

Neptune
Orbital Characteristics of 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)

Physical Characteristics of Neptune

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″
The Atmosphere of Neptune

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)

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