宝瓶座EZ
宝瓶座EZ是一个位于宝瓶座的三合星系统,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]。
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.
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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
- ^ 1.0 1.1 Cutri, R. M.; et al.. 2MASS All Sky Catalog of point sources. NASA. June 2003. Bibcode:2003tmc..book.....C.
- ^ 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).
- ^ 3.0 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.
- ^ Wilson, Ralph Elmer. General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. 1953. Bibcode:1953QB901.W495......
- ^ 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.
- ^ 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.
- ^ 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 .
- ^ 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.
- ^ 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).