宝瓶座EZ

宝瓶座EZ是一个位于宝瓶座三合星系统,距离地球11.3光年(3.5秒差距)。它的三颗成员星都是红矮星。宝瓶座EZ A和C是光谱双星,宝瓶座EZ A和B都发射出X射线,共同组成Luyten 789-6[8]

宝瓶座EZ A/B/C
EZ Aquarii A/B/C
觀測資料
曆元 J2000
星座 宝瓶座
星官
赤經 22h 38m 33.73s[1]
赤緯 –15° 17′ 57.3″[1]
視星等(V) 12.87 (13.33/13.27/14.03)[2]
特性
光谱分类M5 V[2]
U−B 色指数+1.54[3]
B−V 色指数+1.96[3]
R−I 色指数10.64[來源請求]
变星类型耀星
天体测定
徑向速度 (Rv)–59.9[4] km/s
自行 (μ) 赤经:+2314[5] mas/yr
赤纬:+2295[5] mas/yr
视差 (π)289.50 ± 4.40[2] mas
距离11.3 ± 0.2 ly
(3.45 ± 0.05 pc)
绝对星等 (MV)15.64/15.58/16.34[2]
詳細資料
質量0.11/0.11/0.10[2] M
半徑0.5 R
亮度0.0000484 L
溫度2,650[6] K
軌道[7]
伴星宝瓶座EZ B
繞行週期 (P)2.2506 ± 0.0033 yr
半長軸 (a)0.346″ ± 0.004"
偏心率 (e)0.437 ± 0.007
倾斜角 (i)112.4° ± 0.5°
升交点黃經 (Ω)162.1° ± 0.4°
近心点 曆元 (T)1987.236 ± 0.014
近心點幅角 (ω)
(secondary)
–17.7° ± 1.1°
其他命名
Luyten 789-6, GCTP 5475.00, LHS 68, GJ 866, G 156-031.
參考資料庫
SIMBAD资料

宝瓶座EZ目前正在逐渐接近太阳系,大约31400年后,将会到达最近距离7.5光年(2.3秒差距)[9],之后距离逐渐增大。ChView的模拟显示目前最靠近它的恒星是拉卡伊9352,距离大约是4.1光年(1.3秒差距)。

相关条目

参考资料

  1. ^ 1.0 1.1 Cutri, R. M.; et al.. 2MASS All Sky Catalog of point sources. NASA. June 2003. Bibcode:2003tmc..book.....C. 
  2. ^ 2.0 2.1 2.2 2.3 2.4 The One Hundred Nearest Star Systems. RECONS. Georgia State University. [2010-06-30]. (原始内容存档于2012-05-13). 
  3. ^ 3.0 3.1 Eggen, O. J.; Greenstein, J. L. Observations of proper-motion stars. II. Astrophysical Journal. October 1965, 142: 925. Bibcode:1965ApJ...142..925E. doi:10.1086/148362. 
  4. ^ Wilson, Ralph Elmer. General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. 1953. Bibcode:1953QB901.W495...... 
  5. ^ 5.0 5.1 Salim, Samir; Gould, Andrew. Improved Astrometry and Photometry for the Luyten Catalog. II. Faint Stars and the Revised Catalog. The Astrophysical Journal. January 2003, 582 (2): 1011–1031. Bibcode:2003ApJ...582.1011S. arXiv:astro-ph/0206318 . doi:10.1086/344822. 
  6. ^ Casagrande, Luca; Flynn, Chris; Bessell, Michael. M dwarfs: effective temperatures, radii and metallicities. Monthly Notices of the Royal Astronomical Society. September 2008, 389 (2): 585–607. Bibcode:2008MNRAS.389..585C. doi:10.1111/j.1365-2966.2008.13573.x. 
  7. ^ Woitas, J.; Leinert, Ch.; Jahreiß, H.; Henry, T.; Franz, O. G.; Wasserman, L. H. The nearby M-dwarf system Gliese 866 revisited. Astronomy and Astrophysics. January 2000, 353: 253–256. Bibcode:2000A&A...353..253W. arXiv:astro-ph/9910411 . 
  8. ^ Schmitt, J.H.M.M.; Golub, L.; Harnden, F.R. Jr.; Maxson, C.W.; Rosner, R.; Vaiana, G.S. An Einstein Observatory X-ray survey of main-sequence stars with shallow convection zones. Astrophysical Journal. March 1985, 290 (Part 1): 307–320. Bibcode:1985ApJ...290..307S. doi:10.1086/162986. 
  9. ^ Annotations on V* EZ Aqr object. SIMBAD. Centre de Données astronomiques de Strasbourg. [2010-04-21]. (原始内容存档于2020-08-08).