梅西耶13

外部連結

• [https://web.archive.org/web/19961221102737/http://www.seds.org/messier/m/m013.html Messier 13, SEDS Messier pages]
• [http://gclusters.altervista.org/cluster_4.php?ggc=M+13 Messier 13, Galactic Globular Clusters Database page]
• [http://www.perseus.gr/Astro-DSO-NGC-6205.htm Messier 13, High-resolution LRGB image based on 2 hrs total exposure]
• [http://www.darkatmospheres.com/astro/gallery/clusters/enlarge.php?fileBase=clusters_1 M13 Hercules Globular photo detail Dark Atmospheres]
• [http://www.waid-observatory.com/m013-2006-04-14.html Messier 13, Image by Waid Observatory]
• [http://www.nightskyinfo.com/archive/m13_globular_cluster NightSkyInfo.com – M13, the Hercules Globular Cluster]
• [http://www.bellatrixobservatory.org/cvaaI/15/ Photometric study of the V2 cepheid in M13]
• [http://var.astro.cz/oejv/issues/oejv0019.pdf Period, Amplitude and Light Curve of V38 in M13]
• [http://ryutao.main.jp/english/st2k_m13_mt200.html Great Globular Cluster in Hercules (Messier 13/NGC 6205)]

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