Cocoon nebula

Cocoon nebula

(IC 5146) An emission nebula about 1 kiloparsec distant in the constellation Cygnus, surrounding a small cluster of faint stars. It is thought to be a region of active star formation.
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It is also an example of a cocoon nebula, a term that describes the dusty envelope that surrounds some newborn stars in the process of forming planets.
One of my favorite dark nebulae is Barnard 168, or as I call it, the Road to the Cocoon Nebula. When I'm hunting for the position of the Cocoon (IC 5146) in my finderscope, I follow this narrow finger of darkness to the emission nebula's telescopic field.
Another well-known imaging target, the Cocoon Nebula (IC 5146) appeared quite grainy on the standard 5-minute exposure used by Dr Hewitt for all objects, a testimony to this nebula's extreme faintness.
At B168's eastern extremity lies the Cocoon Nebula, an object too faint for binocular viewing.
Not far from M39 lie the Cocoon Nebula and the spooky dark nebula Barnard 168, which S&T's Gary Seronik calls "the Road to the Cocoon." Here too is Pi' ([[pi].sup.1]) Cygni, which has one of my favorite preposterous names: Azelfafage ("ah-ZEL-fuh-fahj," a medieval corruption of the Arabic name "the Tortoise").
It's a cinch to follow B168 to its end, which engulfs IC 5146, the Cocoon Nebula. At first I couldn't see the nebula, but when I added a hydrogen-beta (H[beta]) filter it was immediately apparent, with a 10th-magnitude star at its heart and another at its southern edge.
Another quarry in Cygnus is the 2 [degrees] long Barnard 168, which meanders to and engulfs the Cocoon Nebula (IC 5146) at its eastern end.