M53 (球狀星團)
外部連結 [http://messier.seds.org/m/m053.html SEDS: Messier Object 53] [https://gclusters.altervista.org/cluster_4.php?ggc=M+53 Messier 53, Galactic Globular Clusters Database page]
标签：#Discoveries by Johann Elert Bode
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