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建五

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建五(人馬座ρ1
建五的位置(紅圈)
觀測資料
曆元 J2000
星座 人馬座
星官 斗宿
赤經 19h 21m 40.35942s[1]
赤緯 -17° 50′ 49.9168″[1]
視星等(V) 3.93[2]
特性
光谱分类A9IV[3]
U−B 色指数+0.14[2]
B−V 色指数+0.22[2]
变星类型盾牌座δ型變星[4]
天体测定
徑向速度 (Rv)+1.20[5] km/s
自行 (μ) 赤经:−25.87[1] mas/yr
赤纬:+21.46[1] mas/yr
视差 (π)25.69 ± 0.19[1] mas
距离127.0 ± 0.9 ly
(38.9 ± 0.3 pc)
绝对星等 (MV)0.97[6]
詳細資料
質量1.91[7] M
半徑3.31+0.24
−0.26
[8] R
表面重力 (log g)3.89[9]
亮度30.7±0.8[8] L
溫度7,469+201
−261
[8] K
金属量 [Fe/H]−0.02[10] dex
自轉速度 (v sin i)68[11] km/s
年齡893[9] Myr
其他命名
ρ Pav、​44 Sagittarii、​BD−18° 5322、​GC 26694、​GJ 4107、​HD 181577、​HIP 95168、​HR 7340、​SAO 162512、​PPM 235882、​GSC 06301-02457[12]
參考資料庫
SIMBAD资料

建五Rho1 Sagittarii拉丁化)是人馬座的一顆恆星[13],是位於人馬座南側的一顆變星變星。它具有白色色調,肉眼可見,視星等在3.93左右變動[2]。根據視差,這顆恆星距離太陽系大約127光年[1],並以+1.2公里/秒的徑向速度遠離太陽系[5]。它位於黃道附近,因此可以被月球掩蔽[14]。此外,太陽系的行星如水星與金星等也可能遮掩它,但這現象非常罕見。下一次被行星遮掩將發生在2046年2月23日,人馬座ρ¹被金星遮掩。

這個天體的恆星分類為A9IV[3],匹配遠離主序帶演化成為次巨星。這是一個低振幅的盾牌座δ型變星,範圍從3.94到3.90星等,週期為0.05天[4]。這顆恆星的年齡為8億9300萬年[9],並且以68公里/秒的投影旋轉速度旋轉[11]。它的質量是1.9倍太陽質量[7],和半徑3.3倍太陽半徑[8]。這顆恆星來自光球輻射的光度是太陽光度的31倍,表面的有效溫度為7,469K[8]

參考資料

  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 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.  Vizier catalog entry页面存档备份,存于互联网档案馆
  2. ^ 2.0 2.1 2.2 2.3 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. ^ 3.0 3.1 Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample. The Astronomical Journal. 2006, 132: 161–170. Bibcode:2006AJ....132..161G. S2CID 119476992. arXiv:astro-ph/0603770可免费查阅. doi:10.1086/504637. 
  4. ^ 4.0 4.1 Samus, N. N.; Durlevich, O. V.; et al. VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013). VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 2009, 1. Bibcode:2009yCat....102025S. 
  5. ^ 5.0 5.1 Wilson, R. E. General Catalogue of Stellar Radial Velocities. Carnegie Institution for Science. 1953. Bibcode:1953GCRV..C......0W. LCCN 54001336. 
  6. ^ Anderson, E.; Francis, Ch. XHIP: An extended hipparcos compilation. Astronomy Letters. 2012, 38 (5): 331. Bibcode:2012AstL...38..331A. S2CID 119257644. arXiv:1108.4971可免费查阅. doi:10.1134/S1063773712050015.  Vizier catalog entry页面存档备份,存于互联网档案馆
  7. ^ 7.0 7.1 Allende Prieto, C.; Lambert, D. L. Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures. Astronomy and Astrophysics. 1999, 352: 555–562. Bibcode:1999A&A...352..555A. arXiv:astro-ph/9911002可免费查阅.  Vizier catalog entry页面存档备份,存于互联网档案馆
  8. ^ 8.0 8.1 8.2 8.3 8.4 Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365可免费查阅. doi:10.1051/0004-6361/201833051.  VizieR中此天体在盖亚望远镜第二批数据发布的记录
  9. ^ 9.0 9.1 9.2 David, Trevor J.; Hillenbrand, Lynne A. The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets. The Astrophysical Journal. 2015, 804 (2): 146. Bibcode:2015ApJ...804..146D. S2CID 33401607. arXiv:1501.03154可免费查阅. doi:10.1088/0004-637X/804/2/146.  Vizier catalog entry页面存档备份,存于互联网档案馆
  10. ^ Gontcharov, G. A. Dependence of kinematics on the age of stars in the solar neighborhood. Astronomy Letters. 2012, 38 (12): 771–782. Bibcode:2012AstL...38..771G. S2CID 118345778. arXiv:1606.08814可免费查阅. doi:10.1134/S1063773712120031.  Vizier catalog entry页面存档备份,存于互联网档案馆
  11. ^ 11.0 11.1 Hoffleit, D.; Warren, W. H. Bright Star Catalogue. VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H 5th Revised. 1995, 5050. Bibcode:1995yCat.5050....0H. 
  12. ^ rho01 Sgr. SIMBAD. 斯特拉斯堡天文資料中心. 
  13. ^ 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. 
  14. ^ Edwards, D. A.; Evans, D. S.; Fekel, F. C.; Smith, B. W. Photoelectric observations of lunar occultations. XI.. Astronomical Journal. April 1980, 85: 478–489. Bibcode:1980AJ.....85..478E. doi:10.1086/112700.