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)



    Neptune images:


    www.flickr.com

    retour a la page d'accueil

  • NASA Breaking News


    NASA Invests in Concept Development for Missions to Comet, Saturn Moon Titan
    NASA has selected two finalist concepts for a robotic mission planned to launch in the mid-2020s: a comet sample return mission and a drone-like rotorcraft that would explore potential landing sites on Saturn’s largest moon, Titan.
    read more...

    NASA to Name Finalists for Future Solar System Mission
    NASA will announce finalist concepts for a future robotic mission to explore the solar system during a media teleconference at 2 p.m. EST Wednesday, Dec. 20.
    read more...

    NASA Awards Contract for Aircraft Operations Support
    NASA has awarded the Aircraft Maintenance, Logistics, Integration, Configuration Management and Engineering (ALICE) contract to Yulista Tactical Services, LLC in Huntsville, Alabama.
    read more...

    Nominations Process Opens for National Space Council Users’ Advisory Group
    Public nominations now are being accepted from U.S. citizens and organizations for potential membership on an advisory group that will represent the perspectives, interests and expertise of industry and other non-federal entities to the National Space Council.
    read more...

    Three New Crew Members on Voyage to International Space Station
    Three crew members representing the United States, Russia and Japan are on their way to the International Space Station after launching from the Baikonur Cosmodrome in Kazakhstan at 2:21 a.m. EST Sunday (1:21 p.m. Baikonur time).
    read more...

    NASA Sends New Research to Space Station Aboard SpaceX Resupply Mission
    An experiment in space manufacturing and an enhanced study of solar energy are among the research currently heading to the International Space Station following Friday’s launch of a SpaceX Dragon spacecraft at 10:36 a.m. EST.
    read more...

    Artificial Intelligence, NASA Data Used to Discover Eighth Planet Circling Distant Star
    Our solar system now is tied for most number of planets around a single star, with the recent discovery of an eighth planet circling Kepler-90, a Sun-like star 2,545 light years from Earth. The planet was discovered in data from NASA’s Kepler Space Telescope.
    read more...

    NASA Astronaut Bresnik and Crewmates Return to Earth From Space Station
    Three crew members who have been living and working aboard the International Space Station returned to Earth on Thursday, landing in Kazakhstan after opening a new chapter in the scientific capability of humanity’s premier microgravity laboratory.
    read more...

    NASA Television Updates Broadcast Schedule for Cargo Resupply Mission
    NASA commercial cargo provider SpaceX now is targeting no earlier than 10:36 a.m. EST Friday, Dec. 15, for its 13th commercial resupply services mission to the International Space Station.
    read more...

    NASA Awards Contract for Safety, Mission Assurance Support
    NASA has awarded the Safety and Mission Assurance Support Services III (SMASS III) contract to A-P-T Research, Inc. of Huntsville, Alabama, for a broad range of services at the agency’s Headquarters in Washington, Kennedy Space Center in Florida, and various sites supported by Kennedy’s programs and projects.
    read more...