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The Black Swallowtail Butterfly Cluster, the Box Nebula, and globular cluster NGC 6539

June 30-July 7, 2011: Black Swallowtail Butterfly Cluster offers small-telescope owners a nice view, while large-telescope owners can seek out the Box Nebula and globular cluster NGC 6539.

ophiuchus
This week’s small-telescope target is the Black Swallowtail Butterfly Cluster in northern Ophiuchus. This open cluster also goes by the designation IC 4665.
Astronomy: Roen Kelly
Each week, Astronomy magazine Senior Editor Michael E. Bakich, a master at explaining how to observe, posts a podcast about three objects or events you can see in the sky.

Targets for June 30-July 7, 2011

Small telescope: Black Swallowtail Butterfly Cluster
8-inch or larger telescope: Box Nebula
8-inch or larger telescope: Globular cluster NGC 6539

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