Achernar vs Altair
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| Property | Achernar | Altair |
|---|---|---|
| Bezeichnung | Alp Eri | 53Alp Aql |
| Sternbild | N/A | Aquila |
| Spektralklasse | Class B — B-type (Blue-White) | Class A — A-type (White) |
| Scheinbare Helligkeit | +0.45 | +0.76 |
| Absolute Helligkeit | -2.70 | 2.21 |
| Entfernung | 139 ly | 16.7 ly |
| Masse | N/A | N/A |
| Radius | N/A | N/A |
| Temperatur | N/A | N/A |
| Leuchtkraft | N/A | N/A |
Key Differences
- ◆ Both are among the most rapidly rotating known stars and are significantly oblate as a result.
- ◆ Altair rotates in ~10.4 hours and has been directly imaged to confirm its flattened disk-like shape.
- ◆ Achernar's equatorial diameter is 56% wider than its poles — the most flattened bright star known.
- ◆ Altair is an A-type star; Achernar is a hotter B-type star.
- ◆ Altair is very close at 16.7 light-years; Achernar is 139 light-years away.