The Rosetta nebula (NGC 2237) lives together with an open cluster (NGC 2244) located in the nebula ‘hole’. The young O-type stars of this cluster generate strong radiation and stellar winds which makes the nebula to glow.
Optics: Ritchie-Chretien GSO RC10 f/8 scope
Camera: SBIG STL-6303
HaLRGB Composition (25x1200, 30x600,10x600,10x600,14x600) (numxseconds)
H and L bands in 1x1 binning, RGB in 2x2 binning