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The Keystone

GenitiveHerculis
AbbreviationHer
Right Ascension16h42 to 17h16
Declination+30° 54' to +38° 53'
Area (sq deg)37
Brightest StarZeta Herculis
Optimum VisibilityJune
NotesA group of four stars generally seen as representing the body of Hercules, which together form a rough trapezium shape reminiscent of the keystone of an arch. M13, the globular Hercules Cluster, lies along the western edge of the Keystone between the stars Zeta and Eta Herculis.

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