A beautiful emission nebula in Cygnus that does well with Narrowband hydrogen and oxygen filters. The shell is created by shockwaves from a nearby star interacting with the stellar wind. The oxygen is slightly out in front of the hydrogen if you look closely. This is a HOO shot with the ZWO 1600 ASI Pro Mono cooled with Orion 800 mm f4 Astrograph processed with Pixinsight.

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