天壘城二,即摩羯座46或摩羯座c,是一顆位於摩羯座的G型亮巨星,視星等為+5.10,距離地球約800光年。
天壘城二和虛宿一(寶瓶座β)、天壘城一(寶瓶座ξ)一起被稱為Saʽd al Suʽud,這個名字來自於阿拉伯語سعد السعود, 意思為「幸中之幸」。[1][2]
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