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)
back to main page
NASA Breaking News
NASA Awards Contract for Construction, Maintenance, Environmental, Testing Services
NASA has selected Firelake-Arrowhead NASA Services of Lenexa, Kansas, to perform facility management, surveying, energy management, life safety code compliance and environmental management services for the agency’s Glenn Research Center in Cleveland.
New Mexico Students to Speak with NASA Astronaut on Space Station
Students from six schools in Alamogordo, New Mexico, will speak with a NASA astronaut living, working and doing research aboard the International Space Station at 11 a.m. EST Wednesday, Feb. 21.
Minnesota Students to Speak with NASA Astronauts on Space Station
Students in central Minnesota will speak with NASA astronauts living, working and doing research aboard the International Space Station at 1:35 p.m. EST Tuesday, Feb. 20.
NASA Invites Media to Upcoming Space Station Cargo Launch
Media accreditation now is open for the launch of the next SpaceX delivery of supplies and equipment, including science investigations, to the International Space Station, currently targeted for no earlier than April.
NASA TV to Air US Spacewalk at the International Space Station
Two astronauts will venture outside the International Space Station on Friday, Feb. 16, to move components for the station’s robotic system into long-term storage. Live coverage of the spacewalk will begin at 5:30 a.m. EST on NASA Television and the agency’s website.
Texas Students to Speak with NASA Astronaut on Space Station
Students from Highland Village, Texas, will speak with a NASA astronaut living, working and doing research aboard the International Space Station at 1:10 p.m. EST Wednesday, Feb. 14.
NASA Updates Russian Space Station Cargo Ship Launch, Docking Coverage
Loaded with three tons of food, fuel and supplies, a Russian Progress cargo spacecraft is scheduled to launch at 3:13 a.m. EST (2:13 p.m. Baikonur time) Tuesday, Feb. 13, to resupply the International Space Station.
NASA Acting Administrator Statement on Fiscal Year 2019 Budget Proposal
Statement from acting NASA Administrator Robert Lightfoot on the Fiscal Year 2019 agency budget proposal.
Texas Educators to Speak with NASA Astronaut on Space Station
Pre-service teachers from Houston, Texas, will speak with a NASA astronaut living, working and doing research aboard the International Space Station at 11:35 a.m. EST Tuesday, Feb. 13.
Feb. 12 ‘State of NASA’ Events Highlight Agency Goals for Space Exploration
NASA centers across the country are opening their doors Monday, Feb. 12, to media and social media for “State of NASA” events, including a speech from acting NASA Administrator Robert Lightfoot, and unique opportunities for a behind-the-scenes look at the agency’s work.