The Cave and Pacman Nebulae

Three versions of the Pac Man nebula NGC281. There are three compositions here of RGB, bi-colour and RGB combined with bi-colour. The exposure times were 40 minutes for each RGB colour filter and 60 minutes for each narrow band filter ( H-alpha and Olll ). A ten inch, f/4.8 Newtonian with PHD auto guiding was used:

RGB

 

Bi-colour

RGB+Bi-colour

 

 

SH 2 - 155 The Cave nebula. This emission nebula lies in the constellation of Cepheus at a distance of 2,400 light years .This is an unguided image captured through a ten inch, f/4.8 reflector using 60s sub frames to reduce tracking errors. The exposure times were 60 minutes using a H-alpha filter and 10 minutes for each RGB colour filter: