天市左垣三
| 观测资料 历元 J2000.0 | |
|---|---|
| 星座 | 武仙座[1][2] |
| 星官 | |
| 赤经 | 17h 46m 27.5s[1][2] |
| 赤纬 | +27° 43′ 14″[1][2] |
| 视星等（V） | 3.42[1][2][3] |
| 特性 | |
| 光谱分类 | G5IV[1][2] |
| U−B 色指数 | 0.39[1][2] |
| B−V 色指数 | 0.75[1][2] |
| R−I 色指数 | 0.38[1][2] |
| 天体测定 | |
| 径向速度 (Rv) | 0.39 km/s |
| 自行 (μ) | 赤经：-16 mas/yr 赤纬：- mas/yr |
| 视差 (π) | 119.925 ± 0.16 mas |
| 距离 | 27.20 ± 0.04 ly (8.34 ± 0.01 pc) |
| 轨道[4] | |
| 主星 | 天市左垣三 Aa |
| 伴星 | 天市左垣三 Ab |
| 绕行周期 (P) | 98.9 ± 22.7 yr |
| 半长轴 (a) | 2.9 ± 0.3" |
| 偏心率 (e) | 0.44 ± 0.06 |
| 倾斜角 (i) | 62.82 ± 4.66° |
| 升交点黄经 (Ω) | 80.4 ± 1.7° |
| 近心点 历元 (T) | B 1921.1 ± 23.8 |
| 近心点幅角 (ω) (secondary) | 214 ± 16° |
| 半振幅 (K1) (primary) | 1.12 ± 0.10 km/s |
| 轨道[3] | |
| 主星 | 天市左垣三 B |
| 伴星 | 天市左垣三 C |
| 绕行周期 (P) | 43.127 ± 0.013 yr |
| 半长轴 (a) | 1.385 ± 0.038" |
| 偏心率 (e) | 0.1796 ± 0.0009 |
| 倾斜角 (i) | 66.06 ± 0.15° |
| 升交点黄经 (Ω) | 60.07 ± 0.17° |
| 近心点 历元 (T) | B 2008.335 ± 0.073 |
| 近心点幅角 (ω) (secondary) | 172.85 ± 0.64° |
| 其他命名 | |
| 参考数据库 | |
| SIMBAD | 资料 |
天市左垣三(武仙座μ)也称九河，又名BD+27 2888，HD 161797、SAO 85397、HR 6623，是武仙座的一个恒星系统[1][2]，由四颗恒星组成，视星等为3.42，位于银经52.45，银纬25.63，其B1900.0坐标为赤经17h 42m 32.6s，赤纬+27° 25.63′ 45″。
参考文献
- ^ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Pulsating variable Star. SIMBAD. Centre de Données astronomiques de Strasbourg. [2012-07-13]. （原始内容存档于2018-02-26）.
- ^ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 VizieR Detailed Page. [2012-07-13]. （原始内容存档于2018-02-26）.
- ^ 3.0 3.1 Sixth Catalog of Orbits of Visual Binary Stars. United States Naval Observatory. [23 March 2017]. （原始内容存档于2017-08-01）.
- ^ Roberts Jr., Lewis C.; Mason, Brian D.; Aguilar, Jonathan; Carson, Joseph; Crepp, Justin; Beichman, Charles; Brenner, Douglas; Burruss, Rick; Cady, Eric; Luszcz-Cook, Statia; Dekany, Richard; Hillenbrand, Lynne; Hinkley, Sasha; King, David; Lockhart, Thomas G.; Nilsson, Ricky; Oppenheimer, Rebecca; Parry, Ian R.; Pueyo, Laurent; Rice, Emily L.; Sivaramakrishnan, Anand; Soummer, Rémi; Vasisht, Gautam; Veicht, Aaron; Wang, Ji; Zhai, Chengxing; Zimmerman, Neil T. Characterization of the Companion to μ Her. The Astronomical Journal. 2016, 151 (6): 169. Bibcode:2016AJ....151..169R. S2CID 43403927. arXiv:1604.06494
. doi:10.3847/0004-6256/151/6/169.
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