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Mizar and Alcor
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Mizar and Alcor
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Mizar and Alcor
开阳和辅
开阳,大熊座ζ,是北斗七星勺柄末端的第二颗星;辅,大熊座80星,是开阳的暗伴星,开阳和辅组成了大熊星座的一个目视双星系统。在标准历元J2000赤道坐标系中,赤经为13h23m55.5s,赤纬为+54°55′31″,距离太阳约有83光年。研究发现,开阳和辅实际上是一个六合星聚星系统。
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ultraviolet seeker
ultra-violet sensitizer
ultraviolet sensor
ultraviolet sky
ultraviolet sky survey
ultraviolet source
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ultraviolet spectrophotometry
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ultraviolet sterilization
ultraviolet sterilization technology
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ultraviolet telescope
ultraviolet test lamp
ultraviolet therapy
ultra-violet transmitting
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