Polaris vs Schedar
| 属性 | Polaris | Schedar |
|---|---|---|
| 命名 | 1Alp UMi | 18Alp Cas |
| 星座 | N/A | Cassiopeia |
| 光谱类型 | Class F — F-type (Yellow-White) | Class K — K-type (Orange) |
| 视星等 | +1.97 | +2.24 |
| 绝对星等 | -3.64 | -1.98 |
| 距离 | 433 ly | 228 ly |
| 质量 | N/A | N/A |
| 半径 | N/A | N/A |
| 温度 | N/A | N/A |
| 光度 | N/A | N/A |
主要差异
- ◆ Both are bright northern circumpolar stars useful for orientation near the north celestial pole.
- ◆ Polaris (F-type Cepheid) is currently ~0.7° from the true north pole; Schedar is the brightest star in the W-shaped Cassiopeia.
- ◆ Schedar is a K-type orange giant at ~228 light-years; Polaris is an F-type supergiant at ~431 light-years.
- ◆ Cassiopeia (containing Schedar) and Ursa Minor (containing Polaris) are on opposite sides of the pole.
- ◆ As the pole precesses, Schedar will become a closer pole star in the distant future.