羽林軍廿四

**τ² Aquarii**
	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
赤緯	–13° 35′ 33.4767″
視星等（V）	+4.042
特性
光譜分類	K5 III
U−B 色指數	+1.948
B−V 色指數	+1.566
天體測定
徑向速度 (Rv)	+1.0 km/s
自行 (μ)	赤經：–13.71 mas/yr ; 赤緯：–39.03 mas/yr
視差 (π)	10.27 ± 0.29 mas
距離	318 ± 9 ly ; (97 ± 3 pc)
詳細資料
半徑	53 R☉
其他命名
	Tau Aquarii, 71 Aquarii, BD–14 6354, FK5 861, HD 216032, HIP 112716, HR 8679, NSV 14329, SAO 165321.

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。

寶瓶座71，即寶瓶座τ²（Tau² 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

^ ^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, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
^ ^2.0 ^2.1 ^2.2 ^2.3 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.
^ ^3.0 ^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.
^ 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.
^ ^5.0 ^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:
${\begin{aligned}2\cdot R_{*}&={\frac {(97\cdot 5.12\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 107\cdot R_{\bigodot }\end{aligned}}$
^ tau Aqr -- Star in double system, SIMBAD (Centre de Données astronomiques de Strasbourg), [2012-02-08], （原始內容存檔於2021-02-16）
^ The Colour of Stars, Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004 [2012-01-16], （原始內容存檔於2012-03-10）
^ 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 τ² Aquarii

[aaa474_2_653-1] 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, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.

[sps1966-2] 2.0 ^2.1 ^2.2 ^2.3 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.

[houk1978-3] 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.

[scfs-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.

[lang2006-5] 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:
${\begin{aligned}2\cdot R_{*}&={\frac {(97\cdot 5.12\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 107\cdot R_{\bigodot }\end{aligned}}$

[SIMBAD-6] tau Aqr -- Star in double system, SIMBAD (Centre de Données astronomiques de Strasbourg), [2012-02-08], （原始內容存檔於2021-02-16）

[csiro-7] The Colour of Stars, Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004 [2012-01-16], （原始內容存檔於2012-03-10）

[aaa431_773-8] 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

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觀測資料曆元 J2000
Location of τ¹ Aquarii (circled)
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
光譜分類	K5 III^[3]
U−B 色指數	+1.948^[2]
B−V 色指數	+1.566^[2]
天體測定

徑向速度 (R_v)	+1.0^[4] km/s
自行 (μ)	赤經：–13.71^[1] mas/yr 赤緯：–39.03^[1] mas/yr
視差 (π)	10.27 ± 0.29^[1] mas
距離	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]