HD 180555
HD 180555是位于赤道星座天鹰座的一对联星。它由两颗恒星组成，在周期8.95年，离心率为0.43的轨道上互绕。在8.32″的角分离处还有另一颗恒星，但它与系统无关[3]。
| 观测资料 历元 J2000 | |
|---|---|
| 星座 | 天鹰座 |
| 星官 | |
| 赤经 | 19h 16m 26.78744s[1] |
| 赤纬 | +14° 32′ 40.6234″[1] |
| 视星等（V） | 5.67[2] (5.68 + 9.58)[3] |
| 特性 | |
| 光谱分类 | B9.5V[4] + G0IV[3] |
| U−B 色指数 | −0.12[2] |
| B−V 色指数 | −0.03[2] |
| 天体测定 | |
| 径向速度 (Rv) | −19.3[5] km/s |
| 自行 (μ) | 赤经：+8.09[1] mas/yr 赤纬：+1.03[1] mas/yr |
| 视差 (π) | 7.96 ± 0.60[1] mas |
| 距离 | 410 ± 30 ly (126 ± 9 pc) |
| 轨道[6] | |
| 绕行周期 (P) | 13.673 ± 0.069 yr |
| 半长轴 (a) | 0.0583 ± 0.0014" |
| 偏心率 (e) | 0.022 ± 0.010 |
| 倾斜角 (i) | 131.3 ± 3.7° |
| 升交点黄经 (Ω) | 242.3 ± 4.5° |
| 近心点 历元 (T) | B 2008.572 ± 1.101 |
| 近心点幅角 (ω) (secondary) | 262.7 ± 28.7° |
| 详细资料 | |
| HD 180555 A | |
| 自转速度 (v sin i) | 158[7] km/s |
| 其他命名 | |
| 参考资料库 | |
| SIMBAD | 资料 |
参考资料
编辑- ^ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653–664. Bibcode:2007A&A...474..653V. S2CID 18759600. arXiv:0708.1752
. doi:10.1051/0004-6361:20078357.
- ^ 2.0 2.1 2.2 Mermilliod, J.-C., Compilation of Eggen's UBV data, transformed to UBV (unpublished), Catalogue of Eggen's UBV Data. SIMBAD, 1986, Bibcode:1986EgUBV........0M
- ^ 3.0 3.1 3.2 Eggleton, P. P.; Tokovinin, A. A., A catalogue of multiplicity among bright stellar systems, Monthly Notices of the Royal Astronomical Society, September 2008, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, S2CID 14878976, arXiv:0806.2878 , doi:10.1111/j.1365-2966.2008.13596.x
- ^ Cowley, A.; et al, A study of the bright A stars. I. A catalogue of spectral classifications, Astronomical Journal, April 1969, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819
- ^ Evans, D. S., Batten, Alan Henry; Heard, John Frederick , 编, The Revision of the General Catalogue of Radial Velocities, Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 30 (University of Toronto: International Astronomical Union), June 20–24, 1966, 30: 57, Bibcode:1967IAUS...30...57E
- ^ Sixth Catalog of Orbits of Visual Binary Stars. United States Naval Observatory. [21 May 2017]. （原始内容存档于1 August 2017）.
- ^ Royer, F.; Zorec, J.; Gómez, A. E., Rotational velocities of A-type stars. III. Velocity distributions, Astronomy and Astrophysics, February 2007, 463 (2): 671–682, Bibcode:2007A&A...463..671R, S2CID 18475298, arXiv:astro-ph/0610785 , doi:10.1051/0004-6361:20065224
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