Achernar vs Cygnus X-1
| Property | Achernar | Cygnus X-1 |
|---|---|---|
| Designation | Alp Eri | N/A |
| Constellation | N/A | Cygnus |
| Spectral Class | Class B — B-type (Blue-White) | Class B — B-type (Blue-White) |
| Apparent Magnitude | +0.45 | +8.84 |
| Absolute Magnitude | -2.70 | -0.03 |
| Distance | 139 ly | 1,941 ly |
| Mass | N/A | N/A |
| Radius | N/A | N/A |
| Temperature | N/A | N/A |
| Luminosity | N/A | N/A |