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左执法

η Virginis
觀測資料
曆元 J2000.0
星座 室女座
星官 太微垣 太微左垣
赤經 12h 19m 54.4s
赤緯 −0° 40' 01"
視星等(V) +3.89
距離 250 ± 16 光年
(77 ± 5 pc)
光譜分類 A2IV
其他命名
Zaniah, Zannakh, 15 Virginis, HR 4689, HD 107259, BD+00 2926, FK5 460, HIP 60129, SAO 138721, GC 16813, CCDM 12199-0040

左执法 (η Vir / 室女座η)也称太微左垣一室女座的一颗恒星,距离地球约204光年,英文名Zaniah。其视星等为+3.9,光谱型为A2IV。

虽然在望远镜中看起来是单颗的恒星,但在月掩恒星时却显示左执法是一个密近三星系统,由两颗距离仅0.5天文单位的恒星以及一颗稍远的恒星组成。

由于左执法的位置靠近黄道,所以可能被月亮或行星掩食。在公元前329年9月1日,古希腊天文学家提默洽里斯(Timocharis)观察到左执法被金星掩食,此时行星距离它只有不到一弧分。[1] 最近的一次行星掩左执法发生在1843年9月27日,它被金星掩食。而下一次会发生在2445年11月19日。

语源

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中世纪名字Zaniah源于阿拉伯语زاوية zāwiyah ,意为“角落”,这与右执法的英文名Zavijava来源相同。

参考资料

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  1. ^ Fomenko, A. T.; Vi︠a︡cheslavovich, Vladimir Kalashnikov; Nosovskiĭ, Gleb Vladimirovich. Geometrical and statistical methods of analysis of star configurations: dating Ptolemy's Almagest. CRC Press. 1993: 215. ISBN 0849344832. 

外部链接

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左执法
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