zh %E5%BA%A7%E6%97%97%E4%BA%94

**Psi² Aurigae**
	御夫座ψ2的位置(圈起处)
觀測資料; 曆元 J2000
星座	御夫座
星官
赤經	06h 39m 19.82634s
赤緯	+42° 29′ 19.9617″
視星等（V）	4.79
特性
光谱分类	K3 III or K3 Iab:
U−B 色指数	+1.30
B−V 色指数	+1.23
R−I 色指数	0.6
天体测定
徑向速度 (Rv)	16.09 ± 0.19 km/s
自行 (μ)	赤经：-0.87 mas/yr ; 赤纬：-54.97 mas/yr
视差 (π)	7.84 ± 0.29 mas
距离	420 ± 20 ly ; (128 ± 5 pc)
詳細資料
半徑	27 R☉
表面重力 (log g)	2.30
溫度	4,410 K
金属量 [Fe/H]	–0.10 dex
自轉速度 (v sin i)	1.0 km/s
其他命名
	50 Aurigae, BD+42 1585, HD 47174, HIP 31832, HR 2427, SAO 41239.

座旗五（ψ²Aurigae/御夫座ψ²），是御夫座的一颗恒星。视星等4.79^[2]，以裸眼观测較為黯淡。因为星际气体及尘埃而产生的消光，其亮度减少了0.07^[5]。

根据多项研究表明，由恒星光谱可得座旗五为一颗 K3 III 型巨星^[3]，可是根据 2003 年的研究上座旗五被分类为 K3 Iab 型的超巨星^[4]^[9]。经过周边昏暗修正的角直径测量数据为 1.97 ± 0.02 mas^[10]。估计这颗恒星距离^[1]地球为 27 倍的太阳半径^[6]。

参考资料

^ ^1.0 ^1.1 ^1.2 ^1.3 ^1.4 ^1.5 van Leeuwen, Floor, Validation of the new Hipparcos reduction, Astronomy and Astrophysics, November 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752v1 , doi:10.1051/0004-6361:20078357. Note: see VizieR catalogue I/311 Archive.is的存檔，存档日期2012-12-05.
^ ^2.0 ^2.1 ^2.2 ^2.3 Johnson, H. L.; et al, UBVRIJKL photometry of the bright stars, Communications of the Lunar and Planetary Laboratory, 1966, 4 (99), Bibcode:1966CoLPL...4...99J.
^ ^3.0 ^3.1 Herbig, George H.; Spalding, John F., Jr., Axial Rotation and Line Broadening in Stars of Spectral Types F0-K5, Astrophysical Journal, January 1955, 121: 118, Bibcode:1955ApJ...121..118H, doi:10.1086/145969.
^ ^4.0 ^4.1 Kidger, Mark R.; Martín-Luis, Fabiola, High-Precision Near-Infrared Photometry of a Large Sample of Bright Stars Visible from the Northern Hemisphere, The Astronomical Journal, June 2003, 125 (6): 3311–3333, Bibcode:2003AJ....125.3311K4 请检查|bibcode=值 (帮助), doi:10.1086/374996.
^ ^5.0 ^5.1 Famaey, B.; et al, Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters, Astronomy and Astrophysics, January 2005, 430 (1): 165–186, Bibcode:2005A&A...430..165F, arXiv:astro-ph/0409579 , doi:10.1051/0004-6361:20041272.
^ ^6.0 ^6.1 Lang, Kenneth R., Astrophysical formulae, Astronomy and astrophysics library 1 3, Birkhäuser, 2006 [2013-12-16], ISBN 3-540-29692-1, （原始内容存档于2013-06-22） . The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(128\cdot 1.97\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 54\cdot R_{\bigodot }\end{aligned}}$
^ ^7.0 ^7.1 ^7.2 McWilliam, Andrew, High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances, Astrophysical Journal Supplement Series, December 1990, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527.
^ De Medeiros, J. R.; et al, Rotation and lithium in single giant stars, Astronomy and Astrophysics, November 2000, 363: 239–243, Bibcode:2000A&A...363..239D, arXiv:astro-ph/0010273 .
^ ^9.0 ^9.1 50 Aur -- Star in double system, SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), [2012-08-24], （原始内容存档于2021-07-30）.
^ Richichi, A.; Percheron, I.; Khristoforova, M., CHARM2: An updated Catalog of High Angular Resolution Measurements, Astronomy and Astrophysics, February 2005, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.

[aaa474_2_653-1] 1.0 ^1.1 ^1.2 ^1.3 ^1.4 ^1.5 van Leeuwen, Floor, Validation of the new Hipparcos reduction, Astronomy and Astrophysics, November 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752v1 , doi:10.1051/0004-6361:20078357. Note: see VizieR catalogue I/311 Archive.is的存檔，存档日期2012-12-05.

[clpl4_99-2] 2.0 ^2.1 ^2.2 ^2.3 Johnson, H. L.; et al, UBVRIJKL photometry of the bright stars, Communications of the Lunar and Planetary Laboratory, 1966, 4 (99), Bibcode:1966CoLPL...4...99J.

[apj121_118-3] 3.0 ^3.1 Herbig, George H.; Spalding, John F., Jr., Axial Rotation and Line Broadening in Stars of Spectral Types F0-K5, Astrophysical Journal, January 1955, 121: 118, Bibcode:1955ApJ...121..118H, doi:10.1086/145969.

[aj125_6_3311-4] 4.0 ^4.1 Kidger, Mark R.; Martín-Luis, Fabiola, High-Precision Near-Infrared Photometry of a Large Sample of Bright Stars Visible from the Northern Hemisphere, The Astronomical Journal, June 2003, 125 (6): 3311–3333, Bibcode:2003AJ....125.3311K4 请检查|bibcode=值 (帮助), doi:10.1086/374996.

[aaa430_165-5] 5.0 ^5.1 Famaey, B.; et al, Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters, Astronomy and Astrophysics, January 2005, 430 (1): 165–186, Bibcode:2005A&A...430..165F, arXiv:astro-ph/0409579 , doi:10.1051/0004-6361:20041272.

[lang2006-6] 6.0 ^6.1 Lang, Kenneth R., Astrophysical formulae, Astronomy and astrophysics library 1 3, Birkhäuser, 2006 [2013-12-16], ISBN 3-540-29692-1, （原始内容存档于2013-06-22） . The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(128\cdot 1.97\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 54\cdot R_{\bigodot }\end{aligned}}$

[apjss74-7] 7.0 ^7.1 ^7.2 McWilliam, Andrew, High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances, Astrophysical Journal Supplement Series, December 1990, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527.

[aaa363_239-8] De Medeiros, J. R.; et al, Rotation and lithium in single giant stars, Astronomy and Astrophysics, November 2000, 363: 239–243, Bibcode:2000A&A...363..239D, arXiv:astro-ph/0010273 .

[SIMBAD-9] 9.0 ^9.1 50 Aur -- Star in double system, SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), [2012-08-24], （原始内容存档于2021-07-30）.

[aaa431_773-10] Richichi, A.; Percheron, I.; Khristoforova, M., CHARM2: An updated Catalog of High Angular Resolution Measurements, Astronomy and Astrophysics, February 2005, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.

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