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.
By | Published: June 20, 2013
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