天市右垣八

天市右垣八（巨蛇座ε），也称巴^[9]，是位于巨蛇座的恒星，其视星等为3.69。

天市右垣八

观测资料 历元 J2000.0
星座	巨蛇座
星官
赤经	15h 50m 48.96622s[1]
赤纬	+04° 28′ 39.8311″[1]
视星等（V）	+3.69[2]
特性
光谱分类	kA2hA5mA7 V[3]
U−B 色指数	+0.12[2]
B−V 色指数	+0.14[2]
天体测定
径向速度 (Rv)	2999059999999999999♠−9.4±0.6[4] km/s
自行 (μ)	赤经：+128.19[1] mas/yr 赤纬：+62.16[1] mas/yr
视差 (π)	46.30 ± 0.19[1] mas
距离	70.4 ± 0.3 ly (21.60 ± 0.09 pc)
绝对星等 (MV)	+2.04[5]
详细资料
质量	7000182000000000000♠1.820±0.026[6] M☉
半径	7000178300000000000♠1.783±0.040[6] R☉
表面重力 (log g)	4.346[7]
亮度	7001121340000000000♠12.134±0.296[6] L☉
温度	7003792800000000000♠7,928±88[7] K
金属量 [Fe/H]	+0.38[7] dex
自转速度 (v sin i)	33.1[7] km/s
年龄	7002500000000000000♠500±200[6] Myr
其他命名
ε Ser、​37 Serpentis、​HD 141795、​HIP 77622、​HR 5892、​SAO 121218[8]
参考数据库
SIMBAD	资料

参考文献

1. van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357.
2. Feinstein, A., Photoelectric UBVRI observations of Am stars, Astronomical Journal, 1974, 79: 1290, Bibcode:1974AJ.....79.1290F, doi:10.1086/111675.
3. Gray, R. O.; et al, Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample, The Astronomical Journal, July 2006, 132 (1): 161–170, Bibcode:2006AJ....132..161G, arXiv:astro-ph/0603770 , doi:10.1086/504637.
4. de Bruijne, J. H. J.; Eilers, A.-C., Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project, Astronomy & Astrophysics, October 2012, 546: 14, Bibcode:2012A&A...546A..61D, arXiv:1208.3048 , doi:10.1051/0004-6361/201219219, A61.
5. Anderson, E.; Francis, Ch., XHIP: An extended hipparcos compilation, Astronomy Letters, 2012, 38 (5): 331, Bibcode:2012AstL...38..331A, arXiv:1108.4971 , doi:10.1134/S1063773712050015.
6. Boyajian, Tabetha S.; et al, Stellar Diameters and Temperatures. I. Main-sequence A, F, and G Stars, The Astrophysical Journal, February 2012, 746 (1): 101, Bibcode:2012ApJ...746..101B, arXiv:1112.3316 , doi:10.1088/0004-637X/746/1/101.. See Table 10.
7. David, Trevor J.; Hillenbrand, Lynne A., The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets, The Astrophysical Journal, 2015, 804 (2): 146, Bibcode:2015ApJ...804..146D, arXiv:1501.03154 , doi:10.1088/0004-637X/804/2/146.
8. eps Ser. SIMBAD. 斯特拉斯堡天文资料中心. [2017-09-26].
9. Rodriguez, David R.; et al, Stellar multiplicity and debris discs: an unbiased sample, Monthly Notices of the Royal Astronomical Society, May 2015, 449 (3): 3160–3170, Bibcode:2015MNRAS.449.3160R, arXiv:1503.01320 , doi:10.1093/mnras/stv483.