アケルナル vs アルタイル
| 特性 | アケルナル | アルタイル |
|---|---|---|
| 名称 | Alp Eri | 53Alp Aql |
| 星座 | N/A | Aquila |
| スペクトル型 | Class B — B-type (Blue-White) | Class A — A-type (White) |
| 見かけの等級 | +0.45 | +0.76 |
| 絶対等級 | -2.70 | 2.21 |
| 距離 | 139 ly | 16.7 ly |
| 質量 | N/A | N/A |
| 半径 | N/A | N/A |
| 温度 | N/A | N/A |
| 光度 | N/A | N/A |
主な違い
- ◆ 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.