Bubble Nebula Colour

Here is the Bubble Nebula with a little colour data from 2nd Oct added.

The Bubble Nebula

Last night I was imaging the Bubble Nebula in Cassiopeia. The bubble is  one of three shells of gas surrounding the massive bright star seen near the centre of the bubble. Energetic radiation from the star ionizes the shell, causing it to glow. About six light-years in diameter, the Bubble Nebula is located in the direction of the constellation Cassiopeia. 

This image comprises an integration of 18, 3 minute exposures and was taken with an H alpha filter which restricts the light captured to a narrow section of the spectrum and blocks the glow of moonlight and terrestrial light pollution. 

I hope to gather some colour data to add to this image soon.