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


  • 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:

    retour a la page d'accueil

  • NASA Breaking News

    Media Invited to Preview Expedition to Ocean Twilight Zone
    Media are invited to Seattle on Thursday, Aug. 9, to preview a seaborne expedition to study microscopic organisms in the dark depths of the sea that play a critical role in removing carbon dioxide from Earth’s atmosphere.

    NASA Television to Air Launch of Next Space Station Resupply Mission
    NASA commercial cargo provider SpaceX is targeting no earlier than 5:42 a.m. EDT Friday, June 29, for the launch of its 15th resupply mission to the International Space Station. Live coverage will begin on NASA Television and the agency’s website Thursday, June 28, with prelaunch events.

    New York, Washington, California Students to Call Space Station
    Students from across America are set to participate in three live events with astronauts aboard the International Space Station next week.

    NASA to Host Media Teleconference on National Near-Earth Object Preparedness Report
    NASA will host a media teleconference at 1 p.m. EDT Wednesday, June 20, to discuss a new report detailing U.S. plans for near-Earth objects (NEOs) that could pose a hazard to Earth.

    NASA Administrator Statement on Space Policy Directive-3
    The following is a statement from NASA Administrator Jim Bridenstine on Monday’s signing of Space Policy Directive-3 by President Donald Trump:

    NASA, NSF Plunge Into Ocean ‘Twilight Zone’ to Explore Ecosystem Carbon Flow
    A large multidisciplinary team of scientists, equipped with advanced underwater robotics and an array of analytical instrumentation, will set sail for the northeastern Pacific Ocean this August.

    Brooklyn Students to Link Up with NASA Astronauts on Space Station
    Students from Brooklyn, New York, will have the opportunity to talk with astronauts on the International Space Station this week as part of NASA’s Year of Education on Station.

    Record-Setting NASA Astronaut Peggy Whitson Retires
    NASA astronaut Peggy Whitson, who holds the U.S. record for most cumulative time in space, is retiring from the agency, effective Friday.

    Ramp-Up in Antarctic Ice Loss Speeds Sea Level Rise
    Ice losses from Antarctica have tripled since 2012, increasing global sea levels by 0.12 inch (3 millimeters) in that timeframe alone, according to a major new international climate assessment funded by NASA and ESA (European Space Agency).

    NASA to Hold Media Teleconference on Martian Dust Storm, Mars Opportunity Rover
    NASA will host a media teleconference at 1:30 p.m. EDT Wednesday, June 13, to discuss a massive Martian dust storm affecting operations of the agency’s Opportunity rover and what scientists can learn from the various missions studying this unprecedented event.