IC 5146, also Caldwell 19 and the Cocoon Nebula, is a reflection[1]/emission[2] nebula and Caldwell object in the constellation Cygnus. It shines at magnitude +10.0[3]/+9.3[2]/+7.2.[4] Its celestial coordinates are RA 21h 53.5m, dec+47�� 16��. It is located near the naked-eye star Pi Cygni, the open cluster NGC 7209 in Lacerta, and the bright open cluster M39.[3][1] The cluster is about 4,000 ly away, and the central star that lights it formed about 100,000 years ago[5]; the nebula is about 12 arcmins across, which is equavalent to a span of 15 light years.[4] When viewing IC 5146, dark nebula Barnard 168 (B168) is an inseparable part of the experience, forming a dark lane that surrounds the cluster and projects westward forming the appearance of a trail behind the Cocoon.