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单词 Gamma Crucis
释义

Gamma Crucis

中文百科

十字架一

十字架一γ Cru / 南十字座γ)是南十字座内第三亮的恒星,英文名Gacrux。由于十字架一位于赤纬-60度的天空,所以只有在北回归线以南的地方才可以看到它。

十字架一其实是一对双星系统,距离地球约88光年。主星的视星等为+1.6等,被分类为M4 III型恒星;伴星的视星等则为+6.4等,为A3型恒星,与主星的角距离为128°,所以可用双筒望远镜观测到。十字架一的主星将会离开主序星阶段,变成一颗红巨星。

英语百科

Gamma Crucis 十字架一

Diagram showing star positions and boundaries of the Crux constellation and its surroundings
Description de l'image Crux constellation map-fr.png.

Gamma Crucis (γ Cru, γ Crucis), often called Gacrux, is the nearest red giant star to the Sun. The distance to Gacrux has been determined using parallax measurements made during the Hipparcos mission, which yielded a value of 88.6 light-years (27.2 parsecs) away from Earth. With an apparent visual magnitude of +1.63, this is the third-brightest star in the southern circumpolar constellation of Crux, the Southern Cross, and one of the brightest stars in the night sky. Among Portuguese-speaking peoples it is also named "Rubídea" (or Ruby-like), in reference to its color. A line from the two "Pointers", Alpha Centauri through Beta Centauri, leads to within a few degrees of this star.

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更新时间:2025/6/20 5:39:47