Perihelion: 2,748,938,461 km, 18.37551863 AE
Aphelion: 3,004,419,704 km, 20.08330526 AE
Semi-major axis: 2,876,679,082 km, 19.22941195 AE
Orbital period: 30,799.095 days, 84.323326 years
Synodic period: 369.66 days
Average orbital speed: 6.81 km/s
Mean anomaly: 142.955717°
Inclination: 0.772 556°
Longitude of ascending node: 73.989821°
Argument of perihelion: 96.541 318°
Satellites/moons: 27 (Cordelia, Ophelia, Bianca, Cressida, Desdemona, Juliet, Portia, Rosalind, Mab, Belinda, Perdita, Puck, Cupid, Miranda, Francisco, Ariel, Umbriel, Titania, Oberon, Caliban, Stephano, Trinculo, Sycorax, Margaret, Prospero, Setebos, Ferdinand)
Equatorial radius: 25,559 km (4.007 x Earth)
Flattening: 0.0229 ± 0.0008
Surface area: 8.1156×109 km2 (15.91 x Earth)
Volume: 6.833×1013 km3 (63.086 x Earth)
Mass: 8.6823×1025 kg (14.536 x Earth)
Mean density: 1.27 g/cm3
Equatorial surface gravity: 8.69 m/s2
Escape velocity: 21.3 km/s
Sidereal rotation period: −0.71833 day Earth days, 17 h 14 min 24 s Earth hours
Average surface temperatures: 57 K, -216 °C, -357 °F
Apparent magnitude: 5.9 to 5.32
Angular diameter: 3.3"–4.1"
Composition: 82.5% Hydrogen (H2)
2.3% Methane (CH4)
148ppm Hydrogen Deuteride (HD)
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NASA Breaking News
NASA Awards Facilities, Construction, Engineering, Technical Services Contract
NASA has awarded the Facilities, Construction, Engineering and Technical Services III Contract (FaCETS III) contract to PTSI Managed Services, Inc., of Pasadena, California, for infrastructure maintenance at the agency’s Goddard Space Flight Center in Greenbelt, Maryland.
NASA Updates Schedule for International Space Station Spacewalks
Expedition 50 astronauts will conduct up to three spacewalks outside the International Space Station (ISS) in late March and early April to prepare for the future arrival of U.S. commercial crew spacecraft and upgrade station hardware.
NASA to Host 2017 Human Exploration Rover Challenge
Media are invited to watch as nearly 100 high school and college teams from across the globe compete Friday, March 31 and Saturday, April 1 during NASA’s Human Exploration Rover Challenge at the U.S. Space & Rocket Center in Huntsville, Alabama.
NASA Acting Administrator Statement on the NASA Authorization Act of 2017
Statement from NASA acting Administrator Robert Lightfoot on President Trump signing Tuesday the National Aeronautics and Space Administration Transition Authorization Act of 2017.
NASA TV to Air Seventh Orbital ATK Resupply Mission to International Space Station
NASA commercial cargo provider Orbital ATK is targeting its seventh commercial resupply services mission to the International Space Station for 9 p.m., EDT Friday, March 24, the start of a 30-minute launch window.
NASA TV to Air Preview Briefing, Three U.S. Spacewalks
Expedition 50 astronauts will conduct three spacewalks outside the International Space Station (ISS) in late March and early April to prepare for the future arrival of U.S. commercial crew spacecraft and upgrade station hardware.
NASA Acting Administrator Statement on Fiscal Year 2018 Budget Proposal
Statement from NASA acting Administrator Robert Lightfoot on the Fiscal Year 2018 agency budget proposal.
NASA TV to Air Departure of U.S. Cargo Ship from International Space Station
After delivering about 5,500 pounds of cargo, the SpaceX Dragon cargo spacecraft is set to leave the International Space Station on Sunday, March 19. Live coverage of Dragon's departure will begin at 4:45 a.m. EDT on NASA Television and the agency’s website.
NASA Study Confirms Biofuels Reduce Jet Engine Pollution
Using biofuels to help power jet engines reduces particle emissions in their exhaust by as much as 50 to 70 percent, in a new study conclusion that bodes well for airline economics and Earth’s environment.
West Virginia Students to Speak to NASA Astronauts on Space Station
Students in West Virginia will speak with NASA astronauts living and working aboard the International Space Station at 10:25 a.m. EDT Friday, March 17.