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柳宿增十

柳宿增十 (巨蟹座β,Al Tarf)

柳宿增十是巨蟹座底部的亮星
觀測資料
曆元 J2000
星座 巨蟹座
星官 柳 (柳宿)
赤經 08h 16m 30.9206s[1]
赤緯 +09° 11′ 07.961″[1]
視星等(V) 3.536 [1]
特性
光谱分类K4III [1]
U−B 色指数-1.77 [1]
B−V 色指数-1.48 [1]
变星类型?
天体测定
徑向速度 (Rv)22.94 [1] km/s
自行 (μ) 赤经:-46.80 [1] mas/yr
赤纬:−48.65 [1] mas/yr
视差 (π)11.23 ± 0.97[1] mas
距离290 ± 30 ly
(89 ± 8 pc)
绝对星等 (MV)-1.21
詳細資料
質量2 M
半徑53 [2] R
表面重力 (log g)1.51 [3]
亮度660 [2] L
溫度4,039 [3] K
金屬量-0.12[3].
自轉8 km/s. [1]
其他命名
Altarf, Al Tarf, Tarf, 17 Cancri, HR 3249, HD 69267, BD+09°1917, FK5 312, HIP 40526, SAO 116569, GC 11254, ADS 6704, CCDM 08165+0911
參考資料庫
SIMBAD资料

柳宿增十 (β Cnc / β Cancri)是巨蟹座最亮的恆星,與地球的距離大約是290光年。它的固有名稱是TarfAl Tarf (Altarf),不清楚語源但很可能來自阿拉伯文的الطرف aṭ-ṭarf ("眼睛")或 طرفة aṭ-ṭarfah( 獅子的"一瞥")。

主要的成員,柳宿增十A,是一顆橘色的K-型巨星視星等+3.50,絕對星等-1.25(目視)。它有一顆暗淡,14星等的伴星,柳宿增十B,與主星相距29角秒

相關條目

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參考資料

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  1. ^ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 SIMBAD query result: NSV 3973 -- Variable Star. Centre de Données astronomiques de Strasbourg. [2010-02-23]. (原始内容存档于2016-03-04). 
  2. ^ 2.0 2.1 Professor James B. (Jim) Kaler. AL TARF (Beta Cancri). University of Illinois. [2010-02-23]. (原始内容存档于2019-04-29). 
  3. ^ 3.0 3.1 3.2 Cenarro, A. J.; Peletier, R. F.; et al. Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters (PDF). Astronomy and Astrophysics. 2007, 374 (2): 664–690 [2010-02-23]. Bibcode:2007MNRAS.374..664C. doi:10.1111/j.1365-2966.2006.11196.x. (原始内容存档于2019-05-25). 

外部連結

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Jim Kaler's Stars: Al Tarf页面存档备份,存于互联网档案馆

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柳宿增十
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