NGC 281, H-alpha, Oiii, RGB
H-alpha = 180 minutes
OIII = 330 minutes
RGB (stars) = 60:60:60 minutes
Camera = QSI 583wsg
Telescope = TEC 140
Mount = AP Mach One
Beverage = The Glenlivet 12
Location: downtown Toronto, Canada
Date: Three nights in Aug/Sep/Oct 2014
Software = capture and alignment in Maxim DL, post-processing in PS CS5
So what is this thing?
NGC 281 is located roughly 9,200 light years away in the constellation Cassiopeia.
The massive stars in the middle of this nebula are shaping their environment through powerful stellar winds and intense radiation. They heat up the surrounding gas, causing it to emit light, and forming the pillars you see on the right side of the scene. Opaque dust clouds -- dark nebulae -- block some of the light emitted by these glowing gases.
To capture all this, I combined images captured in narrow wavelengths of light emitted by oxygen and hydrogen atoms, and then later captured standard RGB frames just for the star field (stars in narrowband composites can look pretty strange).
Thanks for looking!