Andromeda
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Likely dwarf planet — the IAU has not ruled on it

Gonggong

Open in OuranosCompare its size

Among the largest worlds beyond Neptune and one of the reddest, on a long orbit tilted 31°. 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
615 km
From the Earth today
89.7 AU (13.4 billion km)

How far, from the Earth

89.7 AU. To cross it:

  • Light12 hours
  • Voyager 1's speed25.2 years
  • Driving at 100 km/h15,300 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.