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The Keystone of Hercules, globular cluster M10, and reflection nebula NGC 6726

June 20–27, 2013: The Keystone asterism in Hercules is an excellent target for naked-eye and binocular observers, globular cluster M10 in Ophiuchus offers small-telescope owners nice views, and large-telescope owners can seek out reflection nebula NGC 6726 in Corona Australis.
Hercules
The Keystone of Hercules marks the Strongman's torso and is made up of the stars Zeta (ζ), Eta (η), Pi (π), and Epsilon (ε) Herculis. // Astronomy: Roen Kelly
Each week, Astronomy magazine Senior Editor Michael E. Bakich, a master at explaining how to observe, posts a podcast about three or more objects or events you can see in the sky.

Targets for June 20–27, 2013

Naked-eye: Keystone of Hercules
Small telescope: Globular cluster M10
Large telescope: Reflection nebula NGC 6726

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