Eridanus
The river. Genitive Eridani, abbreviated Eri. Introduced by Ptolemy.
Area
1,137.91 sq°
6 of 88 by size
Brightest star
α Eridani
magnitude 0.46
Best seen
November
on the meridian at midnight
Visible from
Everywhere on Earth
some part above the horizon
Where it is
Principal stars
Every star to magnitude 4, brightest first.
| Star | Magnitude | HR |
|---|---|---|
| α Eridani | 0.46 | 472 |
| β Eridani | 2.79 | 1666 |
| γ Eridani | 2.95 | 1231 |
| θ1 Eridani | 3.24 | 897 |
| δ Eridani | 3.54 | 1136 |
| φ Eridani | 3.56 | 674 |
| υ4 Eridani | 3.56 | 1347 |
| τ4 Eridani | 3.69 | 1003 |
| χ Eridani | 3.70 | 566 |
| ε Eridani | 3.73 | 1084 |
| υ2 Eridani | 3.82 | 1464 |
| 53 Eridani | 3.87 | 1481 |
| η Eridani | 3.89 | 874 |
| ν Eridani | 3.93 | 1463 |
| 43 Eridani | 3.96 | 1393 |
Deep sky
Objects with a Messier number or a name people use.
| Object | Catalogue | Type | Magnitude | Size |
|---|---|---|---|---|
| Witch Head nebula | IC 2118 | Nebula | — | 180.0 |
- Magnitude: — where NGC 2000 gives none.
- Size: the largest dimension, in arcminutes.
My Sky
Rise, highest and set over your place, for any night: Eridanus
Further info
Sources
Principal stars: Bright Star Catalogue
Deep sky: NGC 2000.0
Area and borders: IAU constellation boundaries
