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。

参旗七

参旗七的位置(红圈处)
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)	7006241827565000000♠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	7001109500000000000♠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	7004218740000000000♠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	7001154000000000000♠15.4±1.0[10] Myr
其他命名
π4 Ori, 3 Orionis, BD+05° 745, FK5 179, HD 30836, HIP 22549, HR 1552, SAO 112142.[11]
參考資料庫
SIMBAD	资料

参考文献

1. van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357.
2. Oja, T., Photoelectric photometry of stars near the north Galactic pole. II, Astronomy and Astrophysics Supplement Series, August 1985, 61: 331–339, Bibcode:1985A&AS...61..331O.
3. Levato, H., Rotational velocities and spectral types for a sample of binary systems, Astronomy and Astrophysics Supplement Series, January 1975, 19: 91–99, Bibcode:1975A&AS...19...91L.
4. Wilson, Ralph Elmer, General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, 1953, Bibcode:1953GCRV..C......0W.
5. Pourbaix, D.; et al, S_B⁹: The ninth catalogue of spectroscopic binary orbits, Astronomy & Astrophysics, 2004, 424 (2): 727, Bibcode:2004A&A...424..727P, arXiv:astro-ph/0406573 , doi:10.1051/0004-6361:20041213.
6. Hohle, M. M.; et al, Masses and luminosities of O- and B-type stars and red supergiants, Astronomische Nachrichten, April 2010, 331 (4): 349, Bibcode:2010AN....331..349H, arXiv:1003.2335 , doi:10.1002/asna.200911355.
7. Underhill, A. B.; et al, Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars, Monthly Notices of the Royal Astronomical Society, November 1979, 189: 601–605, Bibcode:1979MNRAS.189..601U, doi:10.1093/mnras/189.3.601.
8. Soubiran, C.; et al, The PASTEL catalogue of stellar parameters, Astronomy and Astrophysics, June 2010, 515: A111, Bibcode:2010A&A...515A.111S, arXiv:1004.1069 , doi:10.1051/0004-6361/201014247.
9. Simón-Díaz, S.; Herrero, A., The IACOB project. I. Rotational velocities in northern Galactic O- and early B-type stars revisited. The impact of other sources of line-broadening, Astronomy & Astrophysics, 2014, 562: A135, Bibcode:2014A&A...562A.135S, arXiv:1311.3360 , doi:10.1051/0004-6361/201322758.
10. Tetzlaff, N.; et al, A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun, 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.
11. pi.04 Ori -- Spectroscopic binary, SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), [2016-11-18], （原始内容存档于2017-05-10）.