格利澤686

格利澤686 (GJ 686 / HIP 86287 / LHS 452)是一顆位於武仙座的紅矮星，視星等為+9.577。儘管它距離太陽系很近，僅約26.5光年，但它並不是該星座中已知最近的恆星，因為格利澤661距離太陽系20.9光年。離這顆恆星最近的系統是明亮的天市左垣三，距離4.5光年。緊隨其後的是GJ 1230和格利澤6673，距離分別為7.2和7.6光年。 格利澤686是太陽系附近眾多紅矮星之一，光譜類型為M1V，有效溫度約為3600K。它在可見光譜中的亮度等於太陽亮度的 0.82%，而它的總光度相當於太陽亮度的 2.7%，因為這些物體發出的大量輻射星星是紅外線不可見光。格利澤686比其他已知的紅矮星要亮得多；因此，它的亮度是羅斯154的6.5倍，是離太陽系最近的恆星比鄰星的15倍。 格利澤686的半徑大約等於太陽半徑的一半。其預計自轉速度為2.5公里/秒，自轉週期等於或小於10.3天。它的金屬含量低於太陽；各種研究估計其金屬豐度指數在 -0.25 和 -0.44 之間。它的質量大約為太陽質量的45%到49%，並且是一顆具有與拉卡伊9352相當的特性的恆星。 通過徑向速度法發現格利澤686有一個已知的超級地球類行星。 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.  Affer, L.; Damasso, M.; Micela, G.; Poretti, E.; Scandariato, G.; Maldonado, J.; Lanza, A. F.; Covino, E.; Rubio, A. Garrido. HADES RV program with HARPS-N at TNG. IX. A super-Earth around the M dwarf Gl686. Astronomy & Astrophysics. 31 January 2019, 622: A193. Bibcode:2019A&A...622A.193A. ISSN 0004-6361. S2CID 118863481. arXiv:1901.05338 . doi:10.1051/0004-6361/201834868.  Nidever, David L.; Marcy, Geoffrey W.; Butler, R. Paul; Fischer, Debra A.; Vogt, Steven S.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. Radial Velocities for 889 Late-Type Stars. The Astrophysical Journal Supplement Series. 2002, 141 (2): 503–522. Bibcode:2002ApJS..141..503N. S2CID 51814894. arXiv:astro-ph/0112477 . doi:10.1086/340570.  Brown, A. G. A.; et al. Gaia Early Data Release 3: Summary of the contents and survey properties. Astronomy & Astrophysics. 2021, 649: A1. Bibcode:2021A&A...649A...1G. S2CID 227254300. arXiv:2012.01533 . doi:10.1051/0004-6361/202039657 .  已忽略未知参数|collaboration= (帮助) (勘误: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR. LHS 452. SIMBAD. 斯特拉斯堡天文資料中心.  Closest stars. closeststars.com. [2019-03-31]. （原始内容存档于2023-04-11）.  Stars within 15 light-years of Bonner Durchmusterung +18°3421 (The Internet Stellar Database). stellar-database.com. [2019-03-31].  Bonner Durchmusterung +18°3421 (The Internet Stellar Database). stellar-database.com. [2019-03-31]. （原始内容存档于2023-04-11）.  Morales, J. C.; Ribas, I.; Jordi, C. The effect of activity on stellar temperatures and radii. Astronomy and Astrophysics. 2008, 478 (2): 507–512 [2023-04-11]. Bibcode:2008A&A...478..507M. S2CID 16238033. arXiv:0711.3523 . doi:10.1051/0004-6361:20078324. pp. 507-512. （原始内容存档于2018-10-02）.  Houdebine, E. R. Observation and modelling of main-sequence star chromospheres - XIV. Rotation of dM1 stars. Monthly Notices of the Royal Astronomical Society. 2010, 407 (3): 1657. Bibcode:2010MNRAS.407.1657H. doi:10.1111/j.1365-2966.2010.16827.x . pp. 1657–1673.  Jenkins, J. S.; Ramsey, L. W.; Jones, H. R. A.; Pavlenko, Y.; Gallardo, J.; Barnes, J. R.; Pinfield, D. J. Rotational Velocities for M Dwarfs. The Astrophysical Journal. 2009, 704 (2): 975–988. Bibcode:2009ApJ...704..975J. S2CID 119203469. arXiv:0908.4092 . doi:10.1088/0004-637X/704/2/975.  Bonfils, Xavier; Delfosse, Xavier; Udry, Stéphane; Santos, Nuno C.; Forveille, Thierry; Ségransan, Damien. Metallicity of M dwarfs. I. A photometric calibration and the impact on the mass-luminosity relation at the bottom of the main sequence. Astronomy and Astrophysics. 2005, 442 (2): 635–642. Bibcode:2005A&A...442..635B. S2CID 13900901. arXiv:astro-ph/0503260 . doi:10.1051/0004-6361:20053046.  Burt, Jennifer A.; Feng, Fabo; Holden, Bradford; Mamajek, Eric E.; Huang, Chelsea X.; Rosenthal, Mickey M.; Wang, Songhu; Paul Butler, R.; Vogt, Steven S.; Laughlin, Gregory; Henry, Gregory W.; Teske, Johanna K.; Wang, Sharon W.; Crane, Jeffrey D.; Shectman, Steve A., A Collage of Small Planets from the Lick–Carnegie Exoplanet Survey: Exploring the Super-Earth and Sub-Neptune Mass Regime, The Astronomical Journal, 2021, 161 (1): 10, Bibcode:2021AJ....161...10B, S2CID 227013469, arXiv:2011.08867 , doi:10.3847/1538-3881/abc2d0