房宿二

房宿二(天蠍座ρ)是位於天蠍座的雙星系統，其視星等為3.87。

房宿二

Location of ρ Scorpii (circled)
觀測資料 曆元 J2000
星座	天蠍座
星官
赤經	15h 56m 53.07624s[1]
赤緯	-29° 12′ 50.6612″ [1]
視星等（V）	3.86[2]
特性
光譜分類	B2 IV[3]
U−B 色指數	-0.82[2]
B−V 色指數	-0.20[2]
天體測定
徑向速度 (Rv)	−0.40[4] km/s
自行 (μ)	赤經：−15.68[1] mas/yr 赤緯：−24.88[1] mas/yr
視差 (π)	6.91 ± 0.19[1] mas
距離	470 ± 10 ly (145 ± 4 pc)
絕對星等 (MV)	−1.93[5]
軌道[6]
繞行週期 (P)	4.0033 d
偏心率 (e)	0.27
近心點 曆元 (T)	2442178.6060 JD
近心點幅角 (ω) (secondary)	231°
半振幅 (K1) (primary)	16.40 km/s
詳細資料
質量	7000794000000000000♠7.94±0.55[3] M☉
半徑	5.0[7] R☉
亮度 (bolometric)	3,432[3] L☉
溫度	21,150[3] K
自轉速度 (v sin i)	113[8] km/s
其他命名
Iklil, 5 Scorpii, ADS 9846, CCDM J15569-2913A, FK5 3258, GC 21398, HD 142669, HIP 78104, HR 5928, SAO 183957, CD−28° 11714[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. Ducati, J. R., VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system, CDS/ADC Collection of Electronic Catalogues, 2002, 2237, Bibcode:2002yCat.2237....0D.
3. 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.
4. Evans, D. S., The Revision of the General Catalogue of Radial Velocities, Batten, Alan Henry; Heard, John Frederick (編), 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.
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. Pourbaix, D.; et al, S_B⁹: The ninth catalogue of spectroscopic binary orbits, Astronomy and Astrophysics, September 2004, 424: 727–732, Bibcode:2004A&A...424..727P, arXiv:astro-ph/0406573 , doi:10.1051/0004-6361:20041213.
7. Pasinetti Fracassini, L. E.; et al, Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics, Astronomy and Astrophysics, February 2001, 367 (2): 521–524, Bibcode:2001A&A...367..521P, arXiv:astro-ph/0012289 , doi:10.1051/0004-6361:20000451.
8. 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.
9. rho Sco -- Spectroscopic binary, SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), [2016-09-22].

外部連結

• Kaler, James B., Rho Scorpii, Stars (University of Illinois), June 20, 2008 [2016-09-23], （原始內容存檔於2013-01-08）.