Cocoon Nebula (IC5146) and Dark Nebula B168 in Cygnus
This faint emission nebula is located 2°20' SSE of p2 Cygni (see finder chart below). A 2° long complex of dark filaments extending NW and W of Cocoon corresponds to B168 dark nebula.
It is the black spot to the right of the prominent cocoon nebula around the protostar at the center. The teardrop-shaped cocoon nebula around the center protostar is oriented toward the Trapezium stars to the right of the figure above.
The H-beta filter transmits only the H-beta emission line and is only useful on a handful of objects, with the most popular being the Horsehead nebula, the California nebula, and the Cocoon nebula.
These bright infrared sources are known as cocoon nebulae. Two considerations support the idea that the hot stars responsible for the clouds' heating have only recently ignited: (1) These dust cocoons are predicted to disperse quite rapidly once ...
 See also: Nebula, Cocoon, Cluster, Cygnus, Telescope
  
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