The nebula lies about a quarter of the way from Altair to Deneb and consists of gases expelled from the central star that are being excited by the strong UV radiation emitted by this star and emit strongly at certain wavelengths.
Taken on 24-9-18, 12 subs each of LRGB, 120s exposures at 1×1 binning with a QSI 683 camera and a 300mm Orion Optics AG12. I’ve been working my way through Warren Keller’s book on PixInsight and this is my first attempt to process a set of subframes entirely with PixInsight. Compare the final result with 1 of the raw luminance subframes.
M27 Final
M27 – One of the raw luminance subframes