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天壘城二,即摩羯座46或摩羯座c,是一颗位于摩羯座的G型亮巨星,视星等为+5.10,距离地球约800光年。
天壘城二和虚宿一(宝瓶座β)、天垒城一(宝瓶座ξ)一起被称为Saʽd al Suʽud,这个名字来自于阿拉伯语سعد السعود, 意思为“幸中之幸”。[1][2]
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