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箕宿二

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箕宿二(δDelta Sagittarii)
图中显示箕宿二的位置和人马座的界线与周边的区域。
箕宿二的位置(以圆圈标示)
观测资料
历元 J2000.0
星座 人马座
星官 箕宿
赤经 18h 20m 59.64354s[1]
赤纬 −29° 49′ 41.1659″[1]
视星等(V) +2.70[2]
特性
光谱分类K3 III[3]
U−B 色指数+1.55[2]
B−V 色指数+1.38[2]
天体测定
径向速度 (Rv)–19.9[4] km/s
自行 (μ) 赤经:+32.54[1] mas/yr
赤纬:−25.57[1] mas/yr
视差 (π)9.38 ± 0.18[1] mas
距离348 ± 7 ly
(107 ± 2 pc)
绝对星等 (MV)−1.99[5]
详细资料
其他命名
Kaus Media, Kaus Meridionalis, Media, δ Sagittarii, δ Sgr, Delta Sgr, 19 Sagittarii, CCDM J18210-2950A, CPD-30 5513, FK5 687, GC 25024, HD 168454, HIP 89931, HR 6859, IDS 18146-2952 A, PPM 268275, SAO 186681, WDS J18210-2950A.[6]

宿xiùδ Sgrδ Sagittarii)是一颗位于黄道星座人马座内的双星[6],位于人马座的南边,它的固有名称是Kaus MediaKaus MeridionalisMedia。它的视星等是 +2.70[2],使它以以肉眼就很容易看见。以视差测量它与地球的距离大约是348光年(107秒差距[1]

这是一颗巨星,其光谱类型是K3 III。

它有三颗黯淡的伴星[7]

  • 箕宿二B,视星等14等,离主星(箕宿二A)26角秒
  • 箕宿二C,视星等15等,离主星40角秒;
  • 箕宿二D,视星等13等,离主星58角秒;

目前尚不知道这四颗恒星之间是否有物理联系或只是刚好在相同的方向上。

名称和语源

相关条目

参考资料

  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, November 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752可免费查阅, doi:10.1051/0004-6361:20078357 
  2. ^ 2.0 2.1 2.2 2.3 Johnson, H. L.; et al, UBVRIJKL photometry of the bright stars, Communications of the Lunar and Planetary Laboratory, 1966, 4 (99): 99, Bibcode:1966CoLPL...4...99J 
  3. ^ Houk, Nancy, Michigan catalogue of two-dimensional spectral types for the HD stars, Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0 (Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan), 1979, 3, Bibcode:1982mcts.book.....H 
  4. ^ Evans, D. S., Batten, Alan Henry; Heard, John Frederick , 编, The Revision of the General Catalogue of Radial Velocities, Determination of Radial Velocities and their Applications (University of Toronto: International Astronomical Union), June 20–24, 1966, 30: 57 [2009-09-10], Bibcode:1967IAUS...30...57E, (原始内容存档于2019-06-26)  |booktitle=被忽略 (帮助)
  5. ^ Elgarøy, Øystein; Engvold, Oddbjørn; Lund, Niels, The Wilson-Bappu effect of the MgII K line - dependence on stellar temperature, activity and metallicity, Astronomy and Astrophysics, March 1999, 343: 222–228, Bibcode:1999A&A...343..222E 
  6. ^ 6.0 6.1 del Sgr -- Star in double system, SIMBAD (Centre de Données astronomiques de Strasbourg), [2012-01-11], (原始内容存档于2019-12-16) 
  7. ^ Dommanget, J.; Nys, O. Catalogue des composantes d'etoiles doubles et multiples (CCDM) premiere edition - Catalogue of the components of double and multiple stars (CCDM) first edition. Com. de l'Observ. Royal de Belgique. 1994, 115: 1. Bibcode:1994CoORB.115....1D. 
  8. ^ Sagittarius. deepsky.astroinfo.org. [30 August 2008]. (原始内容存档于2016-09-21). 
  9. ^ skywatchers 互联网档案馆存档,存档日期2007-05-17.
  10. ^ 10.0 10.1 Allen, R. H. Star Names: Their Lore and Meaning Reprint. New York: Dover Publications Inc. 1963: 355 [2012-09-04]. ISBN 0-486-21079-0. (原始内容存档于2023-03-05). 
  11. ^ Knobel, E. B. Al Achsasi Al Mouakket, on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket. Monthly Notices of the Royal Astronomical Society. June 1895, 55 (8): 435. Bibcode:1895MNRAS..55..429K. doi:10.1093/mnras/55.8.429. 

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