Cosmic Scale
Epsilon Eridani
Orange dwarf · 10.5 light-years
How big is Epsilon Eridani?
Epsilon Eridani is about 1,023,000 km across.
See Epsilon Eridani in 3D, at true scale
Epsilon Eridani is a young orange dwarf, a little smaller and cooler than the Sun, only 10.5 light-years away. It has at least one giant planet and belts of dust and comets, like a younger version of our own Solar System.
At a glance
| Diameter | 1,023,000 km |
|---|---|
| Mass | 1.63 × 10³⁰ kg |
| Diameter compared with Earth | 80.3 × Earth |
| Distance | 10.5 light-years |
| Age | About 400–800 million years |
| Planet | Epsilon Eridani b |
| Type | Orange dwarf |
Good to know
- It is the nearest star with a known planet that is visible to the naked eye.
- It was one of the first two stars listened to for alien radio signals, in 1960.
- It appears in many science-fiction stories, including Star Trek and Babylon 5.
- Next smaller: HAT-P-67b · 299,200 km
- Next larger: Alpha Centauri B · 1,201,000 km