ケフェウス座シータ星

ケフェウス座シータ星
Theta Cephei
星座 ケフェウス座
見かけの等級 (mv) 4.22[1]
分類 A7 III[2]
位置
元期:J2000.0
赤経 (RA, α)  22h 26m 42.40624s[3]
赤緯 (Dec, δ) +78° 47′ 09.0725″[3]
固有運動 (μ) 赤経:-13.33[3]
赤緯:-36.95[3]
年周視差 (π) 15.83 ± 0.23ミリ秒[3]
（誤差1.5%）
距離 206 ± 3 光年[注 1]
（63.2 ± 0.9 パーセク[注 1]）
絶対等級 (MV) 1.1[注 2]
物理的性質
表面重力 3.74[2]
自転周期 52.0[2]
光度 28[4]
表面温度 7,816[2]
色指数 (B-V) +0.20[1]
色指数 (U-B) +0.16[1]
金属量[Fe/H] +0.27±0.04[5]
他のカタログでの名称
θ Cep, 2 Cep, BD+62° 1821, FK5 767, HD 195725, HIP 101093, HR 7850, SAO 18897[6]
■Template （■ノート ■解説） ■Project

ケフェウス座シータ星(θ Cephei)は、ケフェウス座にある、スペクトル分類A7、4等級の恒星である。白く輝く分光連星で、地球からは約206光年離れている。連星の軌道周期は840.6日で、軌道離心率は0.03である[7]。ケフェウス座イータ星とともに、Al Kidrという固有名を持つ[8]。

中国語では、「天の鉤」という意味の天鈎は、ケフェウス座4番星、HD 194298、ケフェウス座イータ星、ケフェウス座アルファ星、ケフェウス座クシー星、ケフェウス座26番星、ケフェウス座イオタ星及びケフェウス座オミクロン星からなるアステリズムである。ケフェウス座シータ星はこのアステリズムの3番目の星であり、天鈎三と呼ばれる[9]。

脚注

注釈

  1. ^ a b パーセクは1 ÷ 年周視差（秒）より計算、光年は1÷年周視差（秒）×3.2615638より計算
  2. ^ 視等級 + 5 + 5×log（年周視差（秒））より計算。小数第1位まで表記

出典

  1. ^ a b c Johnson, H. L. et al. (1966), “UBVRIJKL photometry of the bright stars”, Communications of the Lunar and Planetary Laboratory 4 (99): 99, Bibcode: 1966CoLPL...4...99J. 
  2. ^ a b c d Takeda, Yoichi et al. (April 2012), “Lithium, Sodium, and Potassium Abundances in Sharp-Lined A-Type Stars”, Publications of the Astronomical Society of Japan 64 (2): 15, arXiv:1111.1603, Bibcode: 2012PASJ...64...38T, doi:10.1093/pasj/64.2.38, 38 
  3. ^ a b c d e van Leeuwen, F. (2007), “Validation of the new Hipparcos reduction”, Astronomy and Astrophysics 474 (2): 653-664, arXiv:0708.1752, Bibcode: 2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  4. ^ McDonald, I. et al. (2012), “Fundamental Parameters and Infrared Excesses of Hipparcos Stars”, Monthly Notices of the Royal Astronomical Society 427 (1): 343-57, arXiv:1208.2037, Bibcode: 2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x. 
  5. ^ Anderson, E.; Francis, Ch. (2012), “XHIP: An extended hipparcos compilation”, Astronomy Letters 38 (5): 331, arXiv:1108.4971, Bibcode: 2012AstL...38..331A, doi:10.1134/S1063773712050015. 
  6. ^ "tet Cep". SIMBAD. Centre de données astronomiques de Strasbourg. 2017年5月6日閲覧。
  7. ^ Pourbaix, D. et al. (2004), “SB9: The ninth catalogue of spectroscopic binary orbits”, Astronomy & Astrophysics 424 (2): 727, arXiv:astro-ph/0406573, Bibcode: 2004A&A...424..727P, doi:10.1051/0004-6361:20041213. 
  8. ^ Allen, Richard Hinckley (1963-06-01). Star Names: Their Lore and Meaning. Dover Publications. p. 155. ISBN 978-0486210797. https://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Cepheus*.html 
  9. ^ （中国語） AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 6 日

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