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库楼七

库楼七
观测资料
历元 J2000
星座 半人马座
星官 苍龙 角宿 库楼
赤经 12h 41m 31.0s
赤纬 −48° 57′ 35″
视星等(V) +2.2 (+2.86/+2.95)
特性
光谱分类A0III/A0III
U−B 色指数−0.01
B−V 色指数−0.01
变星类型none
天体测定
径向速度 (Rv)−6 km/s
自行 (μ) 赤经:−187.28 mas/yr
赤纬:−1.20 mas/yr
视差 (π)25.01 ± 1.01 mas
距离130.4 ly
(40.0 pc)
绝对星等 (MV)−0.8 (−0.14/−0.05)
详细资料
质量2.91+2.85 M
半径3.77+3.62 R
亮度112/106 L
温度9,550/9615 K
金属量?
自转~81 km/s.
年龄?
轨道
伴星γ Centauri B
绕行周期 (P)84.5 yr
半长轴 (a)34AU=0.86"
偏心率 (e)0.79
倾斜角 (i)114°
升交点黄经 (Ω)
近心点 历元 (T)1931.2
其他命名
Muhlifain, HR 4819, HD 110304, CD−48°7597, SAO 223603, WDS 12415-4858, HIP 61932, GC 17262, CCDM J12415-4858
参考数据库
SIMBAD资料

库楼七(γ Cen / 半人马座γ)是半人马座的一颗恒星,俗名Muhlifain[1],注意不要把该名称与大犬座γ的俗称Muliphein混淆;二者均派生于同一个阿拉伯词根محلفين muħlifayn。

库楼七是一颗双星,距离地球约130光年,由两颗光谱型均为A0,视亮度为+2.9的恒星组成。要区分此双星系统,望远镜的口径至少要大于15cm。他们的绕行周期为83年。

年份 角距离 方位角
1990 1.4″ 353°
2000 1.0″ 347°
2005 0.7″ 341°
2010 0.4″ 324°

参考文献

  1. ^ Kunitzsch, P., Arabische Sternnamen in Europa, Otto Harrassowitz, Wiesbaden, p.188.
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库楼七
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