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]。
| 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 | |
| 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- ^ 1.00 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
- ^ 2.0 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
- ^ 3.0 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
- ^ 4.0 4.1 Mermilliod, J.-C., Compilation of Eggen's UBV data, transformed to UBV (unpublished), Catalogue of Eggen's UBV Data.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
- ^ 5.0 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
- ^ 6.0 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.
- ^ 7.0 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.
- ^ 8.0 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）.
- ^ HD 125072. SIMBAD. 斯特拉斯堡天文資料中心.
