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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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topological relation
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topological semigroup
topological semi-lattice
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topological sequence
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topological space of mappings
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topological sphere
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