カペラ (恒星) vs ポルックス (恒星)
Apparent brightness is what most separates them: +0.08 against +1.16, a gap of 1.08 magnitudes. Catalogues list カペラ (恒星) as an M-type star and ポルックス (恒星) as a K-type star in Gemini. Only 33.8 light-years separate the Sun from ポルックス (恒星); カペラ (恒星) sits 1.3 times further out at 42.8. Absolute magnitudes of −0.51 for カペラ (恒星) and +1.08 for ポルックス (恒星) put a factor near 4.3 between their true outputs.
Property comparison
| Property | カペラ (恒星) | ポルックス (恒星) |
|---|---|---|
| 名称 | 13Alp Aur | 78Bet Gem |
| 星座 | N/A | Gemini |
| スペクトル型 | Class M — M-type (Red) | Class K — K-type (Orange) |
| 見かけの等級 | +0.08 | +1.16 |
| 絶対等級 | -0.51 | 1.08 |
| 距離 | 42.8 ly | 33.8 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 |
Full data for each star: カペラ (恒星) · ポルックス (恒星)
Key differences
Key Differences
- ◆ Both are among the nearest and brightest giant stars to the Sun.
- ◆ Capella is the sixth-brightest star and is actually a quadruple system with two G-type giants as the primary pair.
- ◆ Pollux is the single nearest giant star, hosting a confirmed exoplanet.
- ◆ Capella is at ~43 light-years; Pollux is closer at ~34 light-years.
- ◆ The primary pair of Capella orbits each other every 104 days and are not resolvable by eye.