الجدي vs Schedar
| الخاصية | الجدي | Schedar |
|---|---|---|
| التسمية | 1Alp UMi | 18Alp Cas |
| الكوكبة | N/A | Cassiopeia |
| النوع الطيفي | Class F — F-type (Yellow-White) | Class K — K-type (Orange) |
| القدر الظاهري | +1.97 | +2.24 |
| القدر المطلق | -3,64 | -1,98 |
| المسافة | 433 ly | 228 ly |
| الكتلة | N/A | N/A |
| نصف القطر | N/A | N/A |
| درجة الحرارة | N/A | N/A |
| السطوع | N/A | N/A |
الاختلافات الرئيسية
- ◆ 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.