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尾宿七

尾宿七
观测资料
历元 J2000
星座 天蝎座
星官 苍龙 尾宿
赤经 17h 42m 29.3s
赤纬 -39° 01′ 48″
视星等(V) 2.39
特性
光谱分类B1.5 III
U−B 色指数-0.89
B−V 色指数-0.22
变星类型仙王座β变星
天体测定
径向速度 (Rv)-14 km/s
自行 (μ) 赤经:-6.49 mas/yr
赤纬:-25.55 mas/yr
视差 (π)7.03 ± 0.73 mas
距离approx. 460 ly
(approx. 140 pc)
绝对星等 (MV)-3.38
其他命名
Girtab, HR 6580, CD -38°12137, HD 160578, SAO 209163, FK5 660, CPD P-38 6992, HIP 86670.

尾宿七(κ Sco / 天蝎座κ) 是天蝎座的恒星,俗名Girtab。但实际上Girtab也是由尾宿八(天蝎座λ), 尾宿三(天蝎座ζ),和天蝎座ι组成的星群的名字。

尾宿七是一颗分光双星,其主星是一颗仙王座β型脉冲变星。分光学测量到其轨道周期为195天。脉冲主成分周期为4.80小时,次成分周期为4.93小时。

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尾宿七
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