satum is one of the most beautiful planets to look at through a telescope 句子成分分析

主语：satum
系动词：is
表语：one of the most beautiful planets
不定式：to look at through a telescope 做planets的定语 通过望远镜可看到的行星one of the most beautiful planets to look at through a telescope 可以是补语吗？补语是用来补充说明宾语的而这个句子的主句结构：主系表但可以是主补啊！to look at through a telescope 这一部分可以是状语吗？