司怪三
司怪三（猎户座χ2）是一颗位于猎户座的B型超巨星（一说为特超巨星）[1]。它的视星等约为4.646[1]。该星非常沉重而且明亮，距离远至5000光年因此只是一个5等星。实际上该星要比太阳重42倍，总亮度超过太阳的40万倍。该星的大小为0.3天文单位，大约相当于太阳的60-65倍。数百万年后该星即将爆发为一个超新星。
| 觀測資料 曆元 J2000.0 | |
|---|---|
| 星座 | 猎户座 |
| 星官 | 觜宿，司怪 |
| 赤經 | 06h 03m 55.1849s[1] |
| 赤緯 | +20° 08′ 18.427″[1] |
| 視星等（V） | 4.646[1] |
| 特性 | |
| 光谱分类 | B2Iaev[1] |
| U−B 色指数 | −0.68[2] |
| B−V 色指数 | +0.28[2] |
| R−I 色指数 | +0.22[2] |
| 变星类型 | ACYG[3] |
| 天体测定 | |
| 徑向速度 (Rv) | 16.8 ± 0.9[1] km/s |
| 自行 (μ) | 赤经：2.19[1] mas/yr 赤纬：−2.81[1] mas/yr |
| 视差 (π) | 0.65 ± 0.89[1] mas |
| 距离 | approx. 5,000 ly (approx. 2,000 pc) |
| 詳細資料 | |
| 半徑 | 60-65[4] R☉ |
| 自轉速度 (v sin i) | 36[2] km/s |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | 资料 |
相关条目
- 司怪四：猎户座χ1
参考文献
- * 62 Ori -- Emission-line Star, database entry, SIMBAD. Accessed on line January 14, 2011.
- HR 2135, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line January 14, 2011.
- khi 2 Ori, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line January 14, 2011.
- HD 41117, database entry, Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS), 3rd edition, L. E. Pasinetti-Fracassini, L. Pastori, S. Covino, and A. Pozzi, CDS ID II/224. Accessed on line January 14, 2011.
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