アークトゥルス vs カペラ (恒星)
Neighbouring spectral types describe the pair, a K-type star for アークトゥルス against an M-type star for カペラ (恒星). Both lie at a comparable distance from the Sun — 36.7 light-years for アークトゥルス and 42.8 for カペラ (恒星). Seen from Earth the ranking is アークトゥルス first at −0.05, カペラ (恒星) second at +0.08. Corrected for distance, カペラ (恒星) outproduces アークトゥルス by some 1.2 times, absolute magnitudes −0.51 and −0.31.
Property comparison
| Property | アークトゥルス | カペラ (恒星) |
|---|---|---|
| 名称 | 16Alp Boo | 13Alp Aur |
| 星座 | N/A | N/A |
| スペクトル型 | Class K — K-type (Orange) | Class M — M-type (Red) |
| 見かけの等級 | -0.05 | +0.08 |
| 絶対等級 | -0.31 | -0.51 |
| 距離 | 36.7 ly | 42.8 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: アークトゥルス · カペラ (恒星)
Key differences
Key Differences
- ◆ Both are G-K giant systems among the six brightest stars in the night sky.
- ◆ Arcturus is a single K-type giant with an unusual high-velocity orbit through the Galaxy.
- ◆ Capella consists of two G-type giants orbiting each other every 104 days.
- ◆ Arcturus is slightly closer at ~36.7 light-years; Capella is ~43 light-years away.
- ◆ Arcturus is the brightest star in the northern hemisphere; Capella is the brightest in Auriga.