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 Wind Tunnel Tests Lockheed Martin’s X-Plane Design for a Quieter Supersonic Jet
Supersonic passenger airplanes are another step closer to reality as NASA and Lockheed Martin begin the first high-speed wind tunnel tests for the Quiet Supersonic Technology (QueSST) X-plane preliminary design at NASA’s Glenn Research Center in Cleveland.
NASA to Hold Media Teleconference Today on Study to Add Crew to First Orion, Space Launch System Mission
NASA will discuss plans for an ongoing study to assess the feasibility of adding a crew to Exploration Mission-1, the first integrated flight of NASA’s Space Launch System (SLS) rocket and Orion spacecraft, during a media teleconference at 1 p.m. EST today, Friday, Feb. 24. The call will stream live on NASA’s website.
NASA Invites Media to Next Test of Orion Spacecraft Parachutes
NASA is inviting media to attend a test of the Orion spacecraft’s parachutes on Wednesday, March 8, at the U.S. Army’s Yuma Proving Ground in Arizona. Orion is scheduled for its second airdrop test, in a series of eight, to qualify the parachute system for crewed flights.
NASA Women ‘Introduce a Girl to Engineering' Event set for Thursday
NASA celebrates National Engineer Week and Girl's Day with a series of events.
NASA Establishes New Public-Private Partnerships to Advance U.S. Commercial Space Capabilities
NASA is partnering with eight U.S. companies to advance small spacecraft and launch vehicle technologies that are on the verge of maturation and are likely to benefit both NASA and the commercial space market.
NASA Telescope Reveals Largest Batch of Earth-Size, Habitable-Zone Planets Around Single Star
NASA's Spitzer Space Telescope has revealed the first known system of seven Earth-size planets around a single star. Three of these planets are firmly located in the habitable zone, the area around the parent star where a rocky planet is most likely to have liquid water.
NASA to Host News Conference on Discovery Beyond Our Solar System
NASA will hold a news conference at 1 p.m. EST Wednesday, Feb. 22, to present new findings on planets that orbit stars other than our sun, known as exoplanets. The event will air live on NASA Television and the agency's website.
NASA Cargo Headed to Space Station Includes Important Experiments, Equipment
Major experiments that will look into a range of scientific disciplines from human health to atmospheric conditions on Earth are on their way to the International Space Station following liftoff at 9:39 a.m. EST aboard a SpaceX Falcon 9 rocket.
NASA’s Juno Mission to Remain in Current Orbit at Jupiter
NASA’s Juno mission to Jupiter, which has been in orbit around the gas giant since July 4, 2016, will remain in its current 53-day orbit for the remainder of the mission.
NASA to Televise International Space Station Cargo Ship Launch, Docking
NASA Television will provide live coverage of the launch and docking of a Russian cargo spacecraft delivering almost three tons of food, fuel and supplies to the International Space Station beginning at 12:30 a.m. EST Wednesday, Feb. 22.