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
New York Students to Speak with NASA Astronauts on Space Station
Students at U.S. Military Academy in West Point, New York, will speak with NASA astronauts living, working and doing research aboard the International Space Station at 9:15 a.m. EST Monday, Nov. 27.
NASA to Highlight Science on Next Resupply Mission to Space Station
NASA will host a media teleconference at 1 p.m. EST Wednesday, Nov. 29, to discuss a number of science investigations and instruments launching to the International Space Station on the next SpaceX commercial resupply mission.
NASA Astronaut Available for Interviews Before Space Station Mission
NASA astronaut Scott Tingle will be available at 6 a.m. EST Friday, Dec. 1 for live satellite interviews one last time prior to his upcoming launch to the International Space Station Dec. 17, on what will be his first mission in space.
NASA Launches NOAA Weather Satellite Aboard United Launch Alliance Rocket to Improve Forecasts
NASA has successfully launched for the National Oceanic and Atmospheric Administration (NOAA) the first in a series of four highly advanced polar-orbiting satellites, equipped with next-generation technology and designed to improve the accuracy of U.S. weather forecasts out to seven days.
NASA Selects Instrument for Future International Mission to Martian Moons
NASA has selected a science instrument for an upcoming Japan-led sample return mission to the moons of Mars planned for launch in 2024.
Tennessee Students to Speak with NASA Astronauts on International Space Station
Students at Southside Elementary School in Lebanon, Tennessee, will have the opportunity to speak with NASA astronauts living, working and doing research aboard the International Space Station at 10:05 a.m. EST Monday, Nov. 20.
NASA’s Fiscal Year 2017 Financial Audit Result
NASA has received an unmodified audit opinion on its Fiscal Year 2017 (FY 2017) financial statements, making this the seventh consecutive year of "clean" opinions.
NASA Expands Podcast Selections with New Science Series
“Gravity Assist,” a new NASA weekly podcast series, launches Wednesday on NASA.gov and the SoundCloud and iTunes audio platforms.
NASA Space Station Cargo Launches Aboard Orbital ATK Mission
The International Space Station will receive about 7,400 pounds of cargo, including new science and technology investigations, following the successful launch of Orbital ATK’s Cygnus spacecraft from NASA’s Wallops Flight Facility in Virginia Sunday.
NASA Sets Media Coverage of Rescheduled NOAA Weather Satellite Launch
The Joint Polar Satellite System-1 (JPSS-1) satellite, the first in a new series of four highly advanced National Oceanic and Atmospheric Administration (NOAA) polar-orbiting satellites, now is scheduled to launch on Tuesday, Nov. 14, from Vandenberg Air Force Base, California.