参旗八

参旗八（猎户座π5）是位于猎户座的双星系统，其视星等为3.69^[2]。

参旗八

参旗八的位置(红圈处)
观测资料 历元 J2000.0
星座	猎户座
星官
赤经	04h 54m 15.09604s[1]
赤纬	+02° 26′ 26.4231″[1]
视星等（V）	3.69[2]
特性
光谱分类	B2 III[3]
U−B 色指数	−0.81[2]
B−V 色指数	−0.18[2]
变星类型	旋转椭球变星[4]
天体测定
径向速度 (Rv)	+23.4[5] km/s
自行 (μ)	赤经：+0.55[1] mas/yr 赤纬：+0.61[1] mas/yr
视差 (π)	2.43 ± 0.39[1] mas
距离	approx. 1,300 ly (approx. 410 pc)
轨道[6]
绕行周期 (P)	3.7005 d
偏心率 (e)	0.0000
近心点 历元 (T)	7006241792164000000♠2417921.64±0.01 JD
半振幅 (K1) (primary)	7001578800000000000♠57.88±1.07 km/s
详细资料
π5 Ori A
质量	7001125000000000000♠12.5±0.6[7] M☉
表面重力 (log g)	3.51[8]
亮度	11,262[9] L☉
温度	14,496[9] K
金属量 [Fe/H]	−0.28[8] dex
自转速度 (v sin i)	90[10] km/s
年龄	7001158000000000000♠15.8±0.2[7] Myr
其他命名
π5 Ori, 8 Orionis, BD+02° 810, HD 31237, HIP 22797, HR 1567, SAO 112197.[11]
参考资料库
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. Crawford, D. L.; et al, Four-color, H-beta, and UBV photometry for bright B-type stars in the northern hemisphere, The Astronomical Journal, 1971, 76: 1058, Bibcode:1971AJ.....76.1058C, doi:10.1086/111220.
3. Chini, R.; et al, A spectroscopic survey on the multiplicity of high-mass stars, Monthly Notices of the Royal Astronomical Society, 2012, 424 (3): 1925, Bibcode:2012MNRAS.424.1925C, arXiv:1205.5238 , doi:10.1111/j.1365-2966.2012.21317.x.
4. Morris, S. L., The ellipsoidal variable stars, Astrophysical Journal, Part 1, August 1985, 295: 143−152, Bibcode:1985ApJ...295..143M, doi:10.1086/163359.
5. Evans, D. S., The Revision of the General Catalogue of Radial Velocities, Batten, Alan Henry; Heard, John Frederick (编), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, University of Toronto: International Astronomical Union, June 20–24, 1966, Bibcode:1967IAUS...30...57E.
6. 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.
7. Tetzlaff, N.; et al, A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun, Monthly Notices of the Royal Astronomical Society, January 2011, 410 (1): 190–200, Bibcode:2011MNRAS.410..190T, arXiv:1007.4883 , doi:10.1111/j.1365-2966.2010.17434.x.
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. McDonald, I.; et al, Fundamental Parameters and Infrared Excesses of Hipparcos Stars, Monthly Notices of the Royal Astronomical Society, 2012, 427 (1): 343–57, Bibcode:2012MNRAS.427..343M, arXiv:1208.2037 , doi:10.1111/j.1365-2966.2012.21873.x.
10. Abt, Helmut A.; Boonyarak, Chayan, Tidal Effects in Binaries of Various Periods, The Astrophysical Journal, November 2004, 616 (1): 562−566, Bibcode:2004ApJ...616..562A, doi:10.1086/423795.
11. pi.05 Ori -- Spectroscopic binary, SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), [2016-11-18], （原始内容存档于2016-11-23）.

外部链接

• Kaler, James B., Pi-5 Orionis, Stars (University of Illinois), February 6, 2009 [2016-11-22], （原始内容存档于2012-06-19）.