NGC6888 Crescent Nebula
The Crescent Nebula is an emission nebula about 5000 light-years away and 25 light-years across. It is formed by fast stellar wind from a nearby star energizing slower moving wind previously ejected by the star when it became a red giant about 300,000 years ago. Visually the nebula is a rather faint object which looks like a crescent or Euro-sign in a large telescope, giving it another name: the "Euro Sign Nebula". North is at the top.

Scope/Mount: AstroTech AT8RC 8" F8 Ritchey-Chretien with CCDT67 Focal Reducer / Field Flattener, Celestron CI-700 Mount
Camera: Orion StarShoot Pro V2 one-shot color
Guiding: QHY5L-IIM through Orion Deluxe OAG, PHD guiding software
Exposure: (24) 10 min, dithered
Software: Nebulosity, PhotoShop CS2
Comment: 06-04-16, Tierra del Sol, CA. Light wind, below average seeing.