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Gamma Orionis, called Bellatrix, marks one shoulder of the constellation Orion and is a blue-white B-type star with a hot, negative B–V index of −0.224. It shines at apparent magnitude 1.64 from a distance of some 252 light-years, and its absolute magnitude of −2.8 indicates an intrinsic luminosity well beyond the Sun's. Positioned near the celestial equator at declination +6°, Bellatrix is visible from nearly everywhere on Earth. Together with Betelgeuse it forms the upper pair of Orion's rectangular figure, its cooler blue-white light contrasting with the red shoulder opposite.
物理的特性
| スペクトル型 | B Class B — B-type (Blue-White) |
| 色指数 (B−V) | -0.224 |
観測
| 見かけの等級 | +1.64 |
| 絶対等級 | -2.80 |
| 距離 | 252 ly |
| 星座 | Orion |
位置
| 赤経 | 5h 25.13m |
| 赤緯 | 6° 20.98′ |