拉卡伊9352

拉卡伊9352（Lac 9352）是位於南天南魚座的一顆紅矮星，視星等為7.34等。這顆恒星太暗，即使在最良好的視相條件下，肉眼也無法觀察到。視差量測出它距離地球大約10.74光年（3.29秒差距），是距離太陽系最近的第11個恒星系，是星座南魚座中最接近地球的恒星。ChView模擬顯示它最近的鄰居是寶瓶座EZ三合星系統，距離它大約4.1光年遠。 這顆恒星擁有已知的第四高的自行（1881年班傑明·古爾德首次注意到這一點。)，每年總共移動6.9弧秒。然而，因為在一個弧度中有3600弧秒，這仍然是一個非常小的整體運動。這顆恒星的空間速度成分是(U, V, W) = (−93.9, −14.1, −51.4) km/s。如果徑向速度 （'Vr'）等於+9.7公里/秒，那麼大約2,700年前拉卡伊9352距離太陽的最近，約為10.63 ly（3.26 pc）。 拉卡伊9352的光譜分類為M0.5V的類型 ，這表明它是被稱為紅矮星的主序恒星。這是第一顆量測角直徑的紅矮星，其物理直徑約為太陽半徑的46%。它大約擁有太陽質量的一半，表面的有效溫度約為3,626K。 2020年6月，報告了兩顆超級地球行星，以及第三個可能是由於恒星活動造成，週期為50.7天的訊號。然而，如果這真的是顆行星，它可能位於適居帶內。它們是用徑向速度法從智利HARPS和夏威夷HIRES的觀測中檢測出來的 。 鄰近恆星列表 科幻中的拉卡伊9352（英语：Stars_and_planetary_systems_in_fiction#Lacaille 9352） van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. November 2007, 474 (2): 653–664. Bibcode:2007A&A...474..653V. S2CID 18759600. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357.  LACAILLE 9352 -- Pre-main sequence Star. SIMBAD. Centre de Données astronomiques de Strasbourg. [2010-01-20]. （原始内容存档于2023-01-28）.  Demory, Brice-Olivier; Ségransan, Damien; Forveille, Thierry; Queloz, Didier; Beuzit, Jean-Luc; Delfosse, Xavier; Di Folco, Emmanuel; Kervella, Pierre; Le Bouquin, Jean-Baptiste; Perrier, Christian; Benisty, Myriam; Duvert, Gilles; Hofmann, Karl-Heinz; Lopez, Bruno; Petrov, Romain. Mass-radius relation of low and very low-mass stars revisited with the VLTI. Astronomy and Astrophysics. October 2009, 505 (1): 205–215. Bibcode:2009A&A...505..205D. S2CID 14786643. arXiv:0906.0602 . doi:10.1051/0004-6361/200911976.  Cousins, A. W. J. UBV photometry of some southern stars. Monthly Notes of the Astronomical Society of Southern Africa. 1973, 32: 11. Bibcode:1973MNSSA..32...11C.  Micela, G.; Pye, J.; Sciortino, S. Coronal properties of nearby old disk and halo dM stars. Astronomy and Astrophysics. April 1997, 320: 865–877. Bibcode:1997A&A...320..865M.  Torres, G. R.; et al. Search for associations containing young stars (SACY). I. Sample and searching method. Astronomy and Astrophysics. December 2006, 460 (3): 695–708. Bibcode:2006A&A...460..695T. S2CID 16080025. arXiv:astro-ph/0609258 . doi:10.1051/0004-6361:20065602.  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中此天体在盖亚望远镜第二批数据发布的记录 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. Murdin, Paul (编). Encyclopedia of Astronomy and Astrophysics. Bristol: Institute of Physics Publishing. November 2000. Bibcode:2000eaa..bookE5158.. ISBN 0333750888. doi:10.1888/0333750888/5158. absolute magnitude is 9.8  |chapter=被忽略 (帮助) Rabus, Markus; Lachaume, Régis; Jordán, Andrés; Brahm, Rafael; Boyajian, Tabetha; Von Braun, Kaspar; Espinoza, Néstor; Berger, Jean-Philippe; Le Bouquin, Jean-Baptiste; Absil, Olivier. A discontinuity in the Teff–radius relation of M-dwarfs. Monthly Notices of the Royal Astronomical Society. 2019, 484 (2): 2674–2683. Bibcode:2019MNRAS.484.2674R. S2CID 119189542. arXiv:1901.08077 . doi:10.1093/mnras/sty3430.  López-Morales, Mercedes. On the Correlation between the Magnetic Activity Levels, Metallicities, and Radii of Low-Mass Stars. The Astrophysical Journal. May 2007, 660 (1): 732–739. Bibcode:2007ApJ...660..732L. S2CID 119530297. arXiv:astro-ph/0701702 . doi:10.1086/513142.  Yee, Samuel W.; Petigura, Erik A.; von Braun, Kaspar. Precision Stellar Characterization of FGKM Stars using an Empirical Spectral Library. The Astrophysical Journal. 2017, 836 (1): 77. Bibcode:2017ApJ...836...77Y. S2CID 6302522. arXiv:1701.00922 . doi:10.3847/1538-4357/836/1/77.  Research Consortium on Nearby Stars. The One Hundred Nearest Star Systems. Georgia State University. [2010-01-20]. （原始内容存档于2012-05-13）.  Solstation and ChView. [2010-04-20]. （原始内容存档于2012-02-26）.  High Proper Motion Stars in the Hipparcos Catalogue. European Space Agency. July 1, 2007 [2010-01-20]. （原始内容存档于2016-03-03）.  Gould, B. A. Corrigenda in the Uranometria Argentina. Star with large proper motion. Astronomische Nachrichten. 1881, 100 (1): 7–10 [2021-10-20]. Bibcode:1881AN....100....7G. doi:10.1002/asna.18811000104. （原始内容存档于2022-07-13）.  ARICNS star page of Lacaille 9352. Astronomisches Rechen-Institut Heidelberg. [2010-04-16]. （原始内容存档于2012-09-16）.  Annotations on NAME LACAILLE 9352 object. SIMBAD. Centre de Données astronomiques de Strasbourg. [2010-04-16]. （原始内容存档于2011-07-21）.  Glindemann, Andreas; Paresce, Francesco. Giant Eyes for the VLT Interferometer. European Southern Observatory. [2010-01-20]. （原始内容存档于2021-01-28）.  Jeffers, S. V.; Dreizler, S.; Barnes, J. R.; Haswell, C. A.; Nelson, R. P.; Rodríguez, E.; López-González, M. J.; Morales, N.; Luque, R.; et al, A multiple planet system of super-Earths orbiting the brightest red dwarf star GJ887, Science, 2020, 368 (6498): 1477–1481, Bibcode:2020Sci...368.1477J, PMID 32587019, S2CID 220075207, arXiv:2006.16372 , doi:10.1126/science.aaz0795  Why boring could be good for this star's two intriguing planets. Nature. [2020-06-30]. （原始内容存档于2022-07-13）.  引用错误：name属性为“aaa460_3_695”的参考文献没有在<references>标签中给出 SolStation.com: Lacaille 9352 （页面存档备份，存于互联网档案馆）