HD 180555

HD 180555
觀測資料
曆元 J2000
星座 天鷹座
星官
赤經 19h 16m 26.78744s[1]
赤緯 +14° 32′ 40.6234″[1]
視星等（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
徑向速度 (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)
軌道[6]
繞行週期 (P)13.673 ± 0.069 yr
半長軸 (a)0.0583 ± 0.0014"
偏心率 (e)0.022 ± 0.010
倾斜角 (i)131.3 ± 3.7°
升交点黃經 (Ω)242.3 ± 4.5°
近心点 曆元 (T)B 2008.572 ± 1.101
近心點幅角 (ω)
(secondary)		262.7 ± 28.7°
詳細資料
HD 180555 A
自轉速度 (v sin i)158[7] km/s
其他命名
BD+14° 3852、HD 180555、HIP 94720、HR 7307、SAO 104668
參考資料庫
SIMBAD资料

HD 180555是位於赤道星座天鷹座的一對聯星。它由兩顆恆星組成，在週期8.95年，離心率為0.43的軌道上互繞。在8.32″的角分離處還有另一顆恆星，但它與系統無關[3]。

參考資料

  1. ^ 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 可免费查阅. doi:10.1051/0004-6361:20078357. 
  2. ^ 2.0 2.1 2.2 Mermilliod, J.-C., Compilation of Eggen's UBV data, transformed to UBV (unpublished), Catalogue of Eggen's UBV Data.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. ^ 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 可免费查阅, doi:10.1111/j.1365-2966.2008.13596.x 
  4. ^ 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 
  5. ^ 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 
  6. ^ 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）. 
  7. ^ 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 可免费查阅, doi:10.1051/0004-6361:20065224 

外部連結