The Bubble Nebula is a Hydrogen II region in the constellation of Cassiopea. The bubble shape is created by the stellar wind of a massive star. The bubble is about 7 light-years in diameter and was created by a O-type star (white, center) that is several hundred thousands times more luminous then the Sun. The nebula is located about 7 000 light-years away from Earth.
The image was taken from my home site with a 16" RitcheChrétien telescope and QSI583WSG camera on a Paramount ME2. Twenty hours of H Alpha was used and blended in Red and Blue image to make the final composite.
Exposure times were: HRGB 20:3:4:3 hours.
All images were taken in 1x1 binning.