西次相

西次相 (θ Leo / 獅子座θ)是獅子座的一顆恆星，也稱太微右垣四，西次相的光譜型為A0，視星等為+3.4。距離地球170光年。

西次相

西次相的位置(紅圈處)
觀測資料 曆元 J2000.0
星座	獅子座
星官
赤經	11h 14m 14.40446s[1]
赤緯	+15° 25′ 46.4541″[1]
視星等（V）	+3.324[2]
特性
光譜分類	A2 V[3]
U−B 色指數	+0.07[2]
B−V 色指數	–0.02[2]
天體測定
徑向速度 (Rv)	+7.6[4] km/s
自行 (μ)	赤經：-60.31[1] mas/yr 赤緯：-79.10[1] mas/yr
視差 (π)	19.76 ± 0.17[1] mas
距離	165 ± 1 ly (50.6 ± 0.4 pc)
絕對星等 (MV)	−0.19[5]
詳細資料
質量	2.5[6] M☉
表面重力 (log g)	3.65[7]
亮度	141[6] L☉
溫度	9,350[7] K
金屬量 [Fe/H]	+0.05[7] dex
自轉速度 (v sin i)	23[8] km/s
年齡	550[7] Myr
其他命名
θ Leo, Theta Leo, 70 Leo, HR 4359, BD+16 2234, HD 97633, SAO 99512, FK5 423, HIP 54879.[9]
參考資料庫
SIMBAD	資料

參考文獻

1. van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, November 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357
2. Johnson, H. L.; et al, UBVRIJKL photometry of the bright stars, Communications of the Lunar and Planetary Laboratory, 1966, 4 (99), Bibcode:1966CoLPL...4...99J
3. 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
4. Wielen, R.; et al, Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions (35), Astronomisches Rechen-Institut Heidelberg, 1999, Bibcode:1999VeARI..35....1W
5. Anderson, E.; Francis, Ch., XHIP: An extended hipparcos compilation, Astronomy Letters, 2012, 38 (5): 331, Bibcode:2012AstL...38..331A, arXiv:1108.4971 , doi:10.1134/S1063773712050015.
6. Wyatt, M. C.; et al, Steady State Evolution of Debris Disks around A Stars, The Astrophysical Journal, July 2007, 663 (1): 365–382, Bibcode:2007ApJ...663..365W, arXiv:astro-ph/0703608 , doi:10.1086/518404
7. Smith, K. C.; Dworetsky, M. M., Elemental Abundances in Normal Late B-Stars and Hgmn-Stars from Co-Added IUE Spectra - Part One - Iron Peak Elements, Astronomy and Astrophysics, 1993, 274 (2): 335, Bibcode:1993A&A...274..335S
8. 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, arXiv:astro-ph/0610785 , doi:10.1051/0004-6361:20065224
9. tet Leo -- Variable Star, SIMBAD (Centre de Données astronomiques de Strasbourg), [2012-02-11], （原始內容存檔於2020-11-05）