Map of the Universe
Sedna
Dwarf planet · Distant body in the outer Solar System
About Sedna
On 2026-01-01, the date the map shows, Sedna was 83 AU from the Sun; sunlight takes 11.5 hours to reach it.
It goes round the Sun once every 12,846.2 years, at an average distance of 549 AU.
It is about 1,000 km across.
The map lists it as a dwarf planet and shows it in the Solar System part of the map, drawn on the plane of Earth’s orbit (the ecliptic).
Perihelion 76 AU, aphelion about 940 AU: one of the most distant known Solar System objects.
Key numbers
| Semi-major axis | 549 AU |
|---|---|
| Orbital period | 12,846.2 years |
| Eccentricity | 0.8610 |
| Inclination | 11.93° |
| Radius | 500.0 km |
| Distance from the Sun | 83 AU |
Where it is
Its place in the universe, from the inside out: Solar System › Orion–Cygnus Arm (Local Arm) › Milky Way › Local Group › Virgo Supercluster › Laniakea Supercluster › Observable universe.
Zoom out to see it in context: Heliopause and Voyagers, a view about 400 AU across.
From Wikipedia
Sedna is a dwarf planet in the outermost reaches of the Solar System, orbiting the Sun far beyond the orbit of Neptune. It was discovered in 2003, and is roughly 1,000 km in diameter.
Excerpt from the Wikipedia article Sedna (dwarf planet), licensed CC BY-SA 4.0.