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格利泽784

天球赤道座標星圖 20h 13m 53.396s, −45° 09′ 50.47″
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格利泽784
觀測資料
曆元 J2000.0
星座 望遠鏡座
星官
赤經 20h 13m 53.396s[1]
赤緯 -45° 09′ 50.47″[1]
視星等(V) 7.96[2]
特性
光谱分类M0V[2]
B−V 色指数1.45[2]
天体测定
徑向速度 (Rv)−33.5+0.5
[1] km/s
自行 (μ) 赤经:778.331 mas/yr
赤纬:-159.939 mas/yr
视差 (π)162.2171 ± 0.0225[1] mas
距离20.106 ± 0.003 ly
(6.1646 ± 0.0009 pc)
绝对星等 (MV)9.01[3]
詳細資料
質量0.58[4] M
半徑0.58[5] R
亮度0.06[5] L
溫度3,754+92
[6] K
金属量 [Fe/H]−0.07+0.06
[6] dex
自轉48+12
[7]
自轉速度 (v sin i)1.0[2] km/s
年齡0.85+0.4
[8] Gyr
其他命名
CD−45 13677、​HD 191849、​HIP 99701、​SAO 230110、​PPM 325963、​Ci 20 1196、​LFT 1532、​LHS 3531、​LPM 730、​LTT 7999、​NLTT 48880、​PLX 4794、​PM 20103-4519、​TYC 8392-2673-1、​2MASS J20135335-4509506[9]
參考資料庫
SIMBAD资料
Gliese 784 is located in the constellation Telescopium
Gliese 784 is located in the constellation Telescopium
Gliese 784
格利泽784在望遠鏡座的位置

格利泽784 是一顆位於望遠鏡座的紅矮星[8],可能擁有一顆系外行星伴星。這顆恆星發出的光線太微弱,肉眼無法看到,視星等為 7.96。[2] 根據視差確定格利泽784距離太陽20.1光年,並以 −33.5 km/s 的徑向速度漂移得更近。[1]預計該恆星系統將在約121,700年的時間內接近到11.4光年處。[10]

這是一顆小型M型主序星,恆星分類為M0V。[2]它比太陽年輕得多,年齡為約0.85億年。[8]儘管如此,它的自轉周期大約48天。[7]這顆恆星的質量是太陽的58%,半徑是太陽的58%。它從其光球層輻射的光度僅為太陽光度的6%[6]

參考

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  1. ^ 1.0 1.1 1.2 1.3 1.4 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可免费查阅. doi:10.1051/0004-6361/202039657可免费查阅.  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.
  2. ^ 2.0 2.1 2.2 2.3 2.4 2.5 Torres, C. A. O.; 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可免费查阅. doi:10.1051/0004-6361:20065602. 
  3. ^ Anderson, E.; Francis, Ch. XHIP: An extended hipparcos compilation. Astronomy Letters. 2012, 38 (5): 331. Bibcode:2012AstL...38..331A. S2CID 119257644. arXiv:1108.4971可免费查阅. doi:10.1134/S1063773712050015. 
  4. ^ The One Hundred Nearest Star Systems. RECONS. Research Consortium On Nearby Stars. January 1, 2012 [2023-03-22]. (原始内容存档于2012-03-26). 
  5. ^ 5.0 5.1 Gáspár, András; et al. The Correlation between Metallicity and Debris Disk Mass. The Astrophysical Journal. 2016, 826 (2): 171. Bibcode:2016ApJ...826..171G. S2CID 119241004. arXiv:1604.07403可免费查阅. doi:10.3847/0004-637X/826/2/171. 
  6. ^ 6.0 6.1 6.2 Hojjatpanah, S.; et al. Catalog for the ESPRESSO blind radial velocity exoplanet survey. Astronomy & Astrophysics. 2019, 629: A80. Bibcode:2019A&A...629A..80H. S2CID 199552090. arXiv:1908.04627可免费查阅. doi:10.1051/0004-6361/201834729. 
  7. ^ 7.0 7.1 Byrne, P. B.; Doyle, J. G. Activity in late-type dwarfs. III. Chromospheric and transition region line fluxes for two dM stars. Astronomy and Astrophysics. January 1989, 208: 159–165. Bibcode:1989A&A...208..159B. 
  8. ^ 8.0 8.1 8.2 Brems, Stefan S.; et al, Radial-velocity jitter of stars as a function of observational timescale and stellar age, Astronomy & Astrophysics, 2019, 632: A37, Bibcode:2019A&A...632A..37B, S2CID 204838030, arXiv:1910.10389可免费查阅, doi:10.1051/0004-6361/201935520 
  9. ^ HD 191849. SIMBAD. 斯特拉斯堡天文資料中心. 
  10. ^ Bailer-Jones, C.A.L.; et al. New stellar encounters discovered in the second Gaia data release. Astronomy & Astrophysics. 2018, 616: A37. Bibcode:2018A&A...616A..37B. S2CID 56269929. arXiv:1805.07581可免费查阅. doi:10.1051/0004-6361/201833456.