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.
Published:
June 30, 2011
 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.
Photo by Astronomy: Roen Kelly
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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