箕宿二

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箕宿二(δDelta Sagittarii)
圖中顯示箕宿二的位置和人馬座的界線與周邊的區域。
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箕宿二的位置(以圓圈標示)
觀測資料
曆元 J2000.0
星座 人馬座
星官 箕宿
赤經 18h 20m 59.64354s[1]
赤緯 −29° 49′ 41.1659″[1]
視星等(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]
詳細資料
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]

箕宿二δ Sgrδ Sagittarii)是雙星[6],在黃道星座人馬座的南邊,它的固有名稱是Kaus MediaKaus MeridionalisMedia。它的視星等是 +2.70[2],使它以以肉眼就很容易看見。以視差測量它與地球的距離大約是348光年(107秒差距[1]

這是一顆巨星,其光譜類型是K3 III。

它有三顆黯淡的伴星[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。

名稱和語源[编辑]

相關條目[编辑]

參考資料[编辑]

  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, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357 
  2. ^ 2.0 2.1 2.2 2.3 Johnson, H. L.; 等, 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 
  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] 
  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]. 
  9. ^ skywatchers 页面存档备份,存于互联网档案馆
  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. 
  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. 

外部連結[编辑]