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0.806±0.017[6] M
半徑0.83+0.02
−0.01
[1] R
表面重力 (log g)4.48[3]
亮度0.347±0.001[1] L
溫度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

編輯
  1. ^ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 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布的記錄
  2. ^ 2.0 2.1 2.2 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. ^ 3.0 3.1 3.2 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. ^ 4.0 4.1 Mermilliod, J.-C., Compilation of Eggen's UBV data, transformed to UBV (unpublished), Catalogue of Eggen's UBV Data.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. ^ 5.0 5.1 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. ^ 6.0 6.1 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. ^ 7.0 7.1 7.2 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. ^ 8.0 8.1 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.