羽林軍廿四

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關於恆星系統中其他相同拜耳命名法恆星,請參見寶瓶座τ
τ2 Aquarii
Diagram showing star positions and boundaries of the Aquarius constellation and its surroundings
Cercle rouge 100%.svg

Location of τ1 Aquarii (circled)
觀測資料
曆元 J2000
星座 寶瓶座
星官
赤經 22h 49m 35.50157s[1]
赤緯 –13° 35′ 33.4767″[1]
視星等(V) +4.042[2]
特性
光谱分类 K5 III[3]
U−B 色指数 +1.948[2]
B−V 色指数 +1.566[2]
天体测定
径向速度 (Rv) +1.0[4] km/s
自行 (μ) 赤经:–13.71[1] mas/yr
赤纬:–39.03[1] mas/yr
视差 (π) 10.27 ± 0.29[1] mas
距离 318 ± 9 ly
(97 ± 3 pc)
詳細資料
半徑 53[5] R
其他命名
Tau Aquarii, 71 Aquarii, BD–14 6354, FK5 861, HD 216032, HIP 112716, HR 8679, NSV 14329, SAO 165321.[6]

寶瓶座71,即寶瓶座τ2Tau2 Aquarii、τ2 Aqr、τ2 Aquarii),是一顆寶瓶座的恆星,視星等+4.0.[2]。該恆星是一顆橙色的巨星[7]光譜類型 K5 III[3]。它的角直徑在經過周邊昏暗修正後5.12 ± 0.05 mas[8]。它的距離經由視差量測大約是318光年或97秒差距[1],半徑是太陽的53倍[5]

參考資料[编辑]

  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. November 2007, 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode 2007A&A...474..653V. 
  2. ^ 2.0 2.1 2.2 2.3 Gutierrez-Moreno, Adelina ., A System of photometric standards, 1, Publicaciones Universidad de Chile, Department de Astronomy. 1966:  1–17, Bibcode 1966PDAUC...1....1G. 
  3. ^ 3.0 3.1 Houk, Nancy, Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan. 1978, Bibcode 1988mcts.book.....H. 
  4. ^ Wielen, R. ., Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions, Astronomisches Rechen-Institut Heidelberg. 1999, Bibcode 1999VeARI..35....1W. 
  5. ^ 5.0 5.1 Lang, Kenneth R., Astrophysical formulae, Astronomy and astrophysics library, 1. 3, Birkhäuser. 2006, ISBN 3-540-29692-1 . The radius (R*) is given by:
    \begin{align} 2\cdot R_*
 & = \frac{(97\cdot 5.12\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\
 & \approx 107\cdot R_{\bigodot}
\end{align}
  6. ^ tau Aqr -- Star in double system, SIMBAD. Centre de Données astronomiques de Strasbourg [2012-02-08] 
  7. ^ The Colour of Stars, Australia Telescope, Outreach and Education. Commonwealth Scientific and Industrial Research Organisation. December 21, 2004 [2012-01-16] 
  8. ^ Richichi; Percheron, I.; Khristoforova, M., CHARM2: An updated Catalog of High Angular Resolution Measurements, Astronomy and Astrophysics. February 2005, 431: 773–777, doi:10.1051/0004-6361:20042039, Bibcode 2005A&A...431..773R 

外部連結[编辑]