The first planet found by mathematical prediction (1846); its winds are the fastest in the Solar System.
Measured
- Equatorial radius
- 24,764 km
- From the Earth today
- 29.3 AU (4.38 billion km)
How far, from the Earth
29.3 AU. To cross it:
- Light4 hours 3 minutes
- Voyager 1's speed8.22 years
- Driving at 100 km/h4,990 years
Voyager 1 at the speed it moved outward over the year to 2026-10-25 (JPL Horizons). Driving: nonstop, never refuelling.
Spacecraft that went there
- Voyager 2 — The only spacecraft to visit: 25 August 1989.
Where this comes from
- Planets, Pluto, the Moon and Jupiter's big moons: astronomy-engine (Don Cross, MIT). Other moons: JPL Planetary Satellite Mean Elements. Ceres, Eris, Haumea, Makemake: JPL Small-Body Database. NASA/JPL-Caltech.
Every catalogue Ouranos draws is credited on the credits page.