This is NGC 6888 also known as the Crescent Nebula. I do not understand the name at all. Some people call i the Horseshoe Crab Nebula or Euro Sign nebula. I like the name Space Brain Nebula.
This was my first narrowband image. I processed it using an HOO Palette. I’m quite proud of the results I was able to achieve with this. I had originally planned on getting some RGB data for star colors, but time and the weather worked against me.