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