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 Digital Communications Honored with 2017 Webby Awards
NASA's digital communications team will be honored at the 21st Annual Webby Awards on May 16 in New York. For the first time, NASA’s social media presence has been recognized by the Webby Awards, winning in corporate communications and being honored with the People's Voice Award.
NASA Awards Goddard Logistics, Technical Information Services Contract
NASA has awarded the Goddard Logistics and Technical Information II (GLTI II) Services Contract to TRAX International Corporation of Las Vegas.
NASA Astronaut Peggy Whitson Talks STEM Education with President Trump
NASA astronaut Peggy Whitson, currently living and working aboard the International Space Station, broke the record Monday for cumulative time spent in space by a U.S. astronaut – an occasion that was celebrated with a phone call from President Donald Trump, First Daughter Ivanka Trump, and fellow astronaut Kate Rubins.
How to See President’s Call to International Space Station on April 24
President Donald Trump, First Daughter Ivanka Trump, and NASA astronaut Kate Rubins will make a special 20-minute, Earth-to-space call at 10 a.m. EDT Monday, April 24, to personally congratulate NASA astronaut Peggy Whitson for her record-breaking stay aboard the International Space Station.
Two New Crew Members Arrive at International Space Station
After a six-hour flight, NASA astronaut Jack Fischer and cosmonaut Fyodor Yurchikhin of the Russian space agency Roscosmos arrived at the International Space Station at 9:23 a.m. EDT Thursday where they will continue important scientific research.
NASA Eyes Fusion Reactor Engines, Extraterrestrial Drilling, Other Far-Out Technologies with Latest Investment Selections
NASA has selected 399 research and technology proposals from 277 American small businesses and 44 research institutions that will enable NASA's future missions into deep space, and advancements in aviation and science, while also benefiting the U.S. economy.
President Trump Makes Special Long-Distance Call to Record Breaking American Astronaut
President Donald Trump, First Daughter Ivanka Trump, and NASA astronaut Kate Rubins will make a special Earth-to-space call Monday, April 24, from the Oval Office to personally congratulate NASA astronaut Peggy Whitson for her record-breaking stay aboard the International Space Station.
NASA Scientists to Discuss Search for Habitable Planets, Signs of Life off Earth
NASA scientists from across the agency will present their latest findings and perspectives on topics ranging from the origins and evolution of life on Earth to the search for habitable environments and life in our solar system and beyond during the 2017 Astrobiology Science Conference, April 24-28 in Mesa, Arizona.
NASA Space Station Cargo Launches aboard Orbital ATK Resupply Mission
The International Space Station will be capable of dozens of new scientific investigations from NASA and around the world when Orbital ATK's Cygnus spacecraft delivers more than 7,600 pounds of cargo Saturday, April 22.
NASA Celebrates Earth Day with Public Events, Online Activities
This year, NASA will celebrate Earth Day, April 22, with a variety of live and online activities Thursday and Friday, April 20-21, to engage the public in the agency’s mission to better understand and protect our home planet.