Andromeda
Log inJoin

Likely dwarf planet — the IAU has not ruled on it

Sedna

Open in OuranosCompare its size

Never comes nearer the Sun than 76 au, far beyond Neptune's pull, and takes more than 10,000 years to go round. Artist's impression: its surface hasn't been observed up close yet. This look is generated from many factors as a best guess at what it might look like, and will be updated as more data comes in.

Measured

Mean radius
498 km
From the Earth today
81.8 AU (12.2 billion km)

How far, from the Earth

81.8 AU. To cross it:

  • Light11 hours
  • Voyager 1's speed23 years
  • Driving at 100 km/h14,000 years

Voyager 1 at the speed it moved outward over the year to 2026-10-25 (JPL Horizons). Driving: nonstop, never refuelling.

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.