参旗七
参旗七（猎户座π4）是位于猎户座的双星系统，其视星等为3.67。
 | |
| 觀測資料 曆元 J2000.0 | |
|---|---|
| 星座 | 猎户座 |
| 星官 | |
| 赤經 | 04h 51m 12.36472s[1] |
| 赤緯 | +05° 36′ 18.3723″[1] |
| 視星等（V） | 3.685[2] |
| 特性 | |
| 光谱分类 | B2 III[3] |
| U−B 色指数 | −0.797[2] |
| B−V 色指数 | −0.180[2] |
| 天体测定 | |
| 徑向速度 (Rv) | 23.3[4] km/s |
| 自行 (μ) | 赤经：−2.21[1] mas/yr 赤纬：+0.85[1] mas/yr |
| 视差 (π) | 3.10 ± 0.18[1] mas |
| 距离 | 1,050 ± 60 ly (320 ± 20 pc) |
| 軌道[5] | |
| 繞行週期 (P) | 9.5191 d |
| 偏心率 (e) | 0.03 |
| 近心点 曆元 (T) | 2418275.65±10.0 |
| 近心點幅角 (ω) (secondary) | 165° |
| 半振幅 (K1) (primary) | 25.8 km/s |
| 詳細資料 | |
| π4 Ori A | |
| 質量 | 10.95±0.97[6] M☉ |
| 半徑 | 9.1[7] R☉ |
| 表面重力 (log g) | 3.59[8] |
| 亮度 | 19,726[6] L☉ |
| 溫度 | 21,874±126[7] K |
| 金属量 [Fe/H] | −0.31[8] dex |
| 自轉速度 (v sin i) | 38[9] km/s |
| 年齡 | 15.4±1.0[10] Myr |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | 资料 |
参考文献
- van Leeuwen, F., , Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752
, doi:10.1051/0004-6361:20078357. - Oja, T., , Astronomy and Astrophysics Supplement Series, August 1985, 61: 331–339, Bibcode:1985A&AS...61..331O.
- Levato, H., , Astronomy and Astrophysics Supplement Series, January 1975, 19: 91–99, Bibcode:1975A&AS...19...91L.
- Wilson, Ralph Elmer, , Washington: Carnegie Institution of Washington, 1953, Bibcode:1953GCRV..C......0W.
- Pourbaix, D.; et al, , Astronomy & Astrophysics, 2004, 424 (2): 727, Bibcode:2004A&A...424..727P, arXiv:astro-ph/0406573 , doi:10.1051/0004-6361:20041213.
- Hohle, M. M.; et al, , Astronomische Nachrichten, April 2010, 331 (4): 349, Bibcode:2010AN....331..349H, arXiv:1003.2335 , doi:10.1002/asna.200911355.
- Underhill, A. B.; et al, , Monthly Notices of the Royal Astronomical Society, November 1979, 189: 601–605, Bibcode:1979MNRAS.189..601U, doi:10.1093/mnras/189.3.601.
- Soubiran, C.; et al, , Astronomy and Astrophysics, June 2010, 515: A111, Bibcode:2010A&A...515A.111S, arXiv:1004.1069 , doi:10.1051/0004-6361/201014247.
- Simón-Díaz, S.; Herrero, A., , Astronomy & Astrophysics, 2014, 562: A135, Bibcode:2014A&A...562A.135S, arXiv:1311.3360 , doi:10.1051/0004-6361/201322758.
- Tetzlaff, N.; et al, , Monthly Notices of the Royal Astronomical Society, 2011, 410: 190, Bibcode:2011MNRAS.410..190T, arXiv:1007.4883 , doi:10.1111/j.1365-2966.2010.17434.x.
- , SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), [2016-11-18], （原始内容存档于2017-05-10）.
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