IC 5146 (the Cocoon Nebula)

IC 5146 (the Cocoon Nebula) is a reflection/emission nebula in the constellation Cygnus. It shines at magnitude +10.0/+9.3/+7.2. It is located near the naked-eye star Pi Cygni, the open cluster NGC 7209 in Lacerta, and the bright open cluster M39. The cluster is about 4,000 ly away, and the central star that lights it formed about 100,000 years ago; the nebula is about 12 arcmins across, which is equivalent to a span of 15 light years.

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