HD 125072

HD 125072 是一顆位於半人馬座附近的橙矮星。難以用肉眼觀察，視星等為6.637^[2]。根據視差，這顆恆星距離太陽38.5光年^[1]。它正以−14.9 km/s的徑向速度漂移得更近^[5]。

HD 125072

觀測資料 曆元 J2000
星座	半人馬座
星官
赤經	14h 19m 04.83414s[1]
赤緯	−59° 22′ 44.5272″[1]
視星等（V）	6.637[2]
特性
光譜分類	K3 IV[3]
U−B 色指數	+0.905[4]
B−V 色指數	+1.025[4]
天體測定
徑向速度 (Rv)	−14.9[5] km/s
自行 (μ)	赤經：−454.895[1] mas/yr 赤緯：−810.729[1] mas/yr
視差 (π)	84.4535 ± 0.0349[1] mas
距離	38.62 ± 0.02 ly (11.841 ± 0.005 pc)
絕對星等 (MV)	6.28[2]
詳細資料
質量	6999806000000000000♠0.806±0.017[6] M☉
半徑	6999830000000000000♠0.83+0.02 −0.01[1] R☉
表面重力 (log g)	4.48[3]
亮度	6999347000000000000♠0.347±0.001[1] L☉
溫度	7003485800000000000♠4,858+47 −59[1] K
金屬量 [Fe/H]	−0.70[7] dex
自轉速度 (v sin i)	3.97[8] km/s
年齡	9.98[7] Gyr
其他命名
CD−58°5564、​GJ 542、​HD 125072、​HIP 69972、​SAO 241627、​LHS 2892、​LTT 5625[9]
參考資料庫
SIMBAD	資料

這顆恆星的恆星分類是K3IV^[3]，匹配正在演化成巨星的K 型亞巨星。它具有太陽質量的81%^[6]和太陽半徑的83%^[1]。這顆恆星在4,858 K的有效溫度下從其光球層輻射出太陽光度的34.7%^[1]。根據這顆恆星的成分和運動學，估計它的年齡約為100億年^[7]。它的自轉速度為4公里/秒^[8]。

參考資料

1. Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365 . doi:10.1051/0004-6361/201833051. VizieR中此天體在蓋亞望遠鏡第二批數據發佈的記錄
2. Holmberg, J.; Nordström, B.; Andersen, J., The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics, Astronomy and Astrophysics, July 2009, 501 (3): 941–947, Bibcode:2009A&A...501..941H, S2CID 118577511, arXiv:0811.3982 , doi:10.1051/0004-6361/200811191
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, S2CID 119476992, arXiv:astro-ph/0603770 , doi:10.1086/504637
4. Mermilliod, J.-C., Compilation of Eggen's UBV data, transformed to UBV (unpublished), Catalogue of Eggen's UBV Data. SIMBAD, 1986, Bibcode:1986EgUBV........0M
5. Evans, D. S., The Revision of the General Catalogue of Radial Velocities, Batten, Alan Henry; Heard, John Frederick (編), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, University of Toronto: International Astronomical Union, June 20–24, 1966, Bibcode:1967IAUS...30...57E
6. Tsantaki, M.; et al, Deriving precise parameters for cool solar-type stars. Optimizing the iron line list, Astronomy & Astrophysics, July 2013, 555: A150, Bibcode:2013A&A...555A.150T, S2CID 118388752, arXiv:1304.6639 , doi:10.1051/0004-6361/201321103.
7. Lachaume, R.; et al. Age determinations of main-sequence stars: combining different methods. Astronomy and Astrophysics. 1999, 348: 897–909. Bibcode:1999A&A...348..897L.
8. Martínez-Arnáiz, R.; et al. Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter (PDF). Astronomy and Astrophysics. September 2010, 520: A79 [2023-04-20]. Bibcode:2010A&A...520A..79M. S2CID 43455849. arXiv:1002.4391 . doi:10.1051/0004-6361/200913725. （原始內容存檔 (PDF)於2017-09-22）.
9. HD 125072. SIMBAD. 斯特拉斯堡天文資料中心.