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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。
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
光譜分類K3 III[3]
U−B 色指數+1.55[2]
B−V 色指數+1.38[2]
天體測定
徑向速度 (Rv)–19.9[4] km/s
自行 (μ) 赤經:+32.54[1] mas/yr
赤緯:−25.57[1] mas/yr
視差 (π)9.38 ± 0.18[1] mas
距離348 ± 7 ly
(107 ± 2 pc)
絕對星等 (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]

gei1宿sau3δ Sgrδ Sagittarii)是一顆位於黃道星座人馬座內的雙星[6],位於人馬座的南邊,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,視星等14等,離主星(箕宿二A)26角秒
  • 箕宿二C,視星等15等,離主星40角秒;
  • 箕宿二D,視星等13等,離主星58角秒;

目前尚不知道這四顆恆星之間是否有物理聯繫或只是剛好在相同的方向上。

名稱和語源

相關條目

參考資料

  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可免費查閱, 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 , 編, 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, (原始內容存檔於2019-06-26)  |booktitle=被忽略 (幫助)
  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], (原始內容存檔於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]. (原始內容存檔於2016-09-21). 
  9. ^ skywatchers 互聯網檔案館存檔,存檔日期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. (原始內容存檔於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. 

外部連結