Epsilon Eridani b
An artist's impression of Epsilon Eridani b, depicting it as a gas giant with rings. The object near the bottom is a hypothetical moon. | |
| Discovery | |
|---|---|
| Discovered by | Hatzes et al. |
| Discovery site | United States |
| Discovery date | 7 August 2000 |
| Doppler spectroscopy | |
| Orbital characteristics | |
| 3.53±0.04 AU | |
| Eccentricity | 0.06+0.06 −0.04 |
| 7.33+0.08 −0.07 yr | |
| Inclination | 40°+6° −5° |
| 186°+8° −9° | |
| 2458126.5+1657 −502 JD | |
| 268°+62° −105° | |
| Semi-amplitude | 10.6 m/s |
| Star | Epsilon Eridani |
| Physical characteristics | |
| Mass | 1.00±0.10 MJ |
| Temperature | 150 to 200 K (−123 to −73 °C; −190 to −100 °F) |
Epsilon Eridani b, formally named Ægir, is an exoplanet approximately 10.5 light-years away orbiting the star Epsilon Eridani, in the constellation of Eridanus (the River). The planet was discovered in 2000, and as of 2025 remains the only confirmed planet in its planetary system. It is a remarkably close analog to Jupiter, with similar mass and orbit.