羽林軍廿四

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。

τ^2 Aquarii

Location of τ^1 Aquarii (circled)
觀測資料 曆元 J2000
星座	寶瓶座
星官
赤經	22^h 49^m 35.50157^s[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
徑向速度 (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τ^2（Tau^2 Aquarii、τ^2 Aqr、τ^2 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

1. van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, November 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
2. Gutierrez-Moreno, Adelina; et al, A System of photometric standards 1, Publicaciones Universidad de Chile, Department de Astronomy: 1–17, 1966, Bibcode:1966PDAUC...1....1G. 
3. 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.; et al, Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions (35), Astronomisches Rechen-Institut Heidelberg, 1999, Bibcode:1999VeARI..35....1W. 
5. Lang, Kenneth R., Astrophysical formulae, Astronomy and astrophysics library 1 3, Birkhäuser, 2006, ISBN 3-540-29692-1 . The radius (R_*) is given by:

   ${\displaystyle {\begin{aligned}2\cdot R_{*}&={\frac {(97\cdot 5.12\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 107\cdot R_{\bigodot }\end{aligned}}}$

6. tau Aqr -- Star in double system, SIMBAD (Centre de Données astronomiques de Strasbourg), [2012-02-08], （原始内容存档于2021-02-16） 
7. The Colour of Stars, Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004 [2012-01-16], （原始内容存档于2012-03-10） 
8. Richichi, A.; Percheron, I.; Khristoforova, M., CHARM2: An updated Catalog of High Angular Resolution Measurements, Astronomy and Astrophysics, February 2005, 431: 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039 

外部連結

• Image τ^2 Aquarii