アルタイル vs ベガ
| Property |
アルタイル |
ベガ |
| 名称 |
53Alp Aql |
3Alp Lyr |
| 星座 |
Aquila |
Lyra |
| スペクトル型 |
Class A — A-type (White) |
Class A — A-type (White) |
| 見かけの等級 |
+0.76 |
+0.03 |
| 絶対等級 |
2.21 |
0.60 |
| 距離 |
16.7 ly |
25.0 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 |
Key Differences
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Both are A-type stars forming part of the Summer Triangle asterism along with Deneb.
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Vega is at 25 light-years; Altair is even closer at 16.7 light-years.
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Altair rotates extremely rapidly (once every 10.4 hours), making it noticeably oblate; Vega also rotates fast but less extremely.
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Vega is about four times more luminous than Altair.
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Vega has a prominent debris disk suggesting possible planetary formation; Altair's disk is less prominent.