// Constellation
Eridanus
- Latin name
- Eridanus (Eri)
- Best visibility
- evenings in December
- Fully visible between
- 32° N – 90° S
- Naked-eye stars
- 129
Eridanus is highest in the evening sky (around 9 pm) in December. The whole constellation rises above the horizon between 32° N and 90° S. Its brightest star is Achernar at magnitude 0.45 — about 139 light-years away.
The brightest stars
| Star | Designation | Magnitude | Distance |
|---|---|---|---|
| Achernar | α Eri | 0.45 | 139 ly |
| Cursa | β Eri | 2.78 | 89 ly |
| Acamar | θ¹ Eri | 2.88 | 161 ly |
| Zaurak | γ Eri | 2.97 | 203 ly |
| Rana | δ Eri | 3.52 | 29 ly |
| — | υ⁴ Eri | 3.55 | 178 ly |
More constellations
Star data: HYG database. Constellation borders: IAU.