シリウス vs ベガ
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| Property | シリウス | ベガ |
|---|---|---|
| 名称 | 9Alp CMa | 3Alp Lyr |
| 星座 | Canis Major | Lyra |
| スペクトル型 | Class A — A-type (White) | Class A — A-type (White) |
| 見かけの等級 | -1.44 | +0.03 |
| 絶対等級 | 1.45 | 0.60 |
| 距離 | 8.6 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
- ◆ Both are brilliant white A-type stars and among the most prominent in the northern sky.
- ◆ Sirius is the brightest star overall at magnitude −1.46; Vega is the fifth-brightest at magnitude 0.03.
- ◆ Sirius is 8.6 light-years away; Vega is 25 light-years from the Sun.
- ◆ Vega was the original zero-point for stellar magnitude; Sirius sets the scale of brightness.
- ◆ Sirius has a white dwarf companion; Vega has a prominent debris disk but no known companion.