RCW 104, a Wolf Rayett nebula, in OIII. The OIII shell is very different in structure to the H-apha shell. It is also very faint compared with the background stars, and hard to show in the same image as the H-alpha shell. OIII 10 hrs in 1hr subs. Aspen CG16M on 20 inch PlaneWave.

RCW 104Wolf RayettOIIIOxygen III