NGC 7635 the Bubble nebula using bicolor narrowband technique
NGC 7635, the Bubble nebula in the Constellation Cassiopeia located 7100 to 11,000 light years from Earth. This was processed by assigning Ha to red and OIII to blue and mashing Ha and OIII to create a "synthetic green".
Ha 20min subs totaling 3 hours.
OIII 20 min subs totaling 1 hour and 20 minutes.
Imaging camera: QSI 683 wsg-8
Imaging telescope: Astro-Tech 8" Ritchey-Chrétien (FL 1625mm)
Losmandy g11 Gemini II German equatorial mount
Taken October 10 and 11, 2013