Dwarf planets · Distant dwarf planet

Sedna

About 83 AU from the Sun · Light crosses it in 0.0033 seconds

Across

1,000 km

Vs Earth

7.85% of Earth

Open Sedna in Cosmic Scale

About

Sedna is one of the most distant known worlds in the Solar System. Its stretched orbit never brings it closer than 76 AU from the Sun and carries it out to about 900 AU, so a single trip around takes some 11,000 years.

One of the reddest objects known; a single orbit takes about 11,000 years.

At a glance

Size	About 1,000 km
Orbit	About 11,000 years
Closest to the Sun	76 AU, in 2076
Discovered	2003

Did you know

1. It is one of the reddest objects in the Solar System, coloured by sunlight-cooked ices.
2. Nothing known could have pushed it onto its orbit, which is one reason people suspect a distant unseen planet or a passing star.
3. It is named after the Inuit goddess of the sea.