座旗增一

座旗增一（ψ¹Aurigae/御夫座ψ¹），是御夫座的一颗恒星。视星等4.91^[2]，裸眼观测显得微亮。每年测量的时差数据为0.82^[1]，根据这个数据可以推导出距离地球4000光年（1200秒差距）。

Psi¹

ψ1 在御夫座的位置 (circled)
觀測資料 曆元 J2000
星座	御夫座
星官
赤經	06h 24m 53.90129s[1]
赤緯	+49° 17′ 16.4199″[1]
視星等（V）	4.91[2]
特性
光谱分类	M0 I[3]
U−B 色指数	+2.29[2]
B−V 色指数	+1.97[2]
R−I 色指数	1.07
变星类型	LC[4]
天体测定
徑向速度 (Rv)	+4.7[5] km/s
自行 (μ)	赤经：–0.66[1] mas/yr 赤纬：–1.82[1] mas/yr
视差 (π)	0.82 ± 0.28[1] mas
距离	approx. 4,000 ly (approx. 1,200 pc)
詳細資料
質量	14.4 ± 0.8[6] M☉
亮度	63,579[7] L☉
溫度	3,750[3] K
金属量 [Fe/H]	+0.08[8] dex
年齡	12.3 ± 0.4[6] Myr
其他命名
BD+49 1488, FK5 242, HD 44537, HIP 30520, HR 2289, SAO 41076.[9]

由恒星光谱可得座旗增一为一颗M型红巨星^[3]。并且座旗增一是一颗亮度变化幅度为0.44的LC型慢不规则变星^[4]， 它的质量是太阳的14倍^[6]，亮度是太阳的63,579倍^[7]，其外大气层有效温度3750K^[3]，因此显示出橘红色。

参考资料

1. 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. Nicolet, B., Photoelectric photometric Catalogue of homogeneous measurements in the UBV System, Astronomy and Astrophysics Supplement Series, 1978, 34: 1–49, Bibcode:1978A&AS...34....1N.
3. Levesque, Emily M.; et al, The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought, The Astrophysical Journal, August 2005, 628 (2): 973–985, Bibcode:2005ApJ...628..973L, arXiv:astro-ph/0504337 , doi:10.1086/430901.
4. Adelman, Saul J., Stars with the Largest Hipparcos Photometric Amplitudes, Baltic Astronomy, 2001, 10: 589–593, Bibcode:2001BaltA..10..589A.
5. 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.
6. Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M., A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun, Monthly Notices of the Royal Astronomical Society, January 2011, 410 (1): 190–200, Bibcode:2011MNRAS.410..190T, arXiv:1007.4883 , doi:10.1111/j.1365-2966.2010.17434.x.
7. Hohle, M. M.; Neuhäuser, R.; Schutz, B. F., Masses and luminosities of O- and B-type stars and red supergiants, Astronomische Nachrichten, April 2010, 331 (4): 349, Bibcode:2010AN....331..349H, arXiv:1003.2335 , doi:10.1002/asna.200911355.
8. Bakos, Gustav A., Abundances of Heavy Elements in Late-Type Stars, Journal of the Royal Astronomical Society of Canada, October 1971, 65: 222, Bibcode:1971JRASC..65..222B.
9. phi Aur -- Star in double system, SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), [2012-08-23], （原始内容存档于2016-03-05）.