シリウス vs ベガ
| 特性 |
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
|
主な違い
- ◆ 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.