拉卡伊9352
觀測資料 曆元 J2000 | |
---|---|
星座 | 南魚座 |
星官 | |
赤經 | 23h 05m 52.03604s[1] |
赤緯 | −35° 51′ 11.0475″[1] |
視星等(V) | 7.34[2] |
特性 | |
光谱分类 | M0.5V[3] |
U−B 色指数 | +1.18[4] |
B−V 色指数 | +1.50[4] |
变星类型 | 疑似[5] |
天体测定 | |
徑向速度 (Rv) | +9.7[6] km/s |
自行 (μ) | 赤经:+6,765.995[7] mas/yr 赤纬:+1,330.388[7] mas/yr |
视差 (π) | 304.1354 ± 0.0200[8] mas |
距离 | 10.7241 ± 0.0007 ly (3.2880 ± 0.0002 pc) |
绝对星等 (MV) | 9.8[9] |
詳細資料 | |
質量 | 0.486 ± 0.012[10] M☉ |
半徑 | 0.470 ± 0.001[10] R☉ |
表面重力 (log g) | 4.78[10] |
亮度 | ±0.0022 0.0367[10] L☉ |
溫度 | ±57 3,692[10] K |
金属量 [Fe/H] | −0.22 ± 0.09[11] dex |
自轉速度 (v sin i) | 1[6] km/s |
年齡 | 4.57[12] Gyr |
其他命名 | |
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[4]。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)[1],是距離太陽系最近的第11個恒星系[13],是星座南魚座中最接近地球的恒星。ChView模擬[14]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。
性質
這顆恒星擁有已知的第四高的自行[15](1881年班傑明·古爾德首次注意到這一點[16]。),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[17]。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)[18]。
拉卡伊9352的光譜分類為M0.5V的類型 [3],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[19],其物理直徑約為太陽半徑的46%[3]。它大約擁有太陽質量的一半[3],表面的有效溫度約為3,626K[3]。
行星系
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 [20][21]。
成員 (依恆星距離) |
质量 | 半長軸 (AU) |
轨道周期 (天) |
離心率 | 傾角 | 半径 |
---|---|---|---|---|---|---|
b | ±0.6 ≥ 4.2M⊕ | ±0.002 0.068 | ±0.001 9.262 | +0.09 −0.06 0.09 |
— | — |
c | ±1.2 ≥ 7.6M⊕ | ±0.004 0.120 | +0.004 −0.005 21.789 |
+0.09 −0.10 0.22 |
— | — |
d (未确认) | ≳ 8.3M⊕ | ~0.21 | ~50.7 | +0.20 −0.15 0.25 |
相關條目
參考資料
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. doi:10.1051/0004-6361:20078357.
- ^ 2.0 2.1 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).
- ^ 3.0 3.1 3.2 3.3 3.4 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.
- ^ 4.0 4.1 4.2 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.
- ^ 6.0 6.1 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.
- ^ 7.0 7.1 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
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. 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) - ^ 10.0 10.1 10.2 10.3 10.4 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
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- ^ 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
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- ^ 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).
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- ^ 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).
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