This is a three panel mosaic of this wonderful supernova remnant in Cygnus, maybe the largest in the sky. The progenitor star, 20 times more massive than our sun, exploded some 10000 to 20000 years ago in a distance of about 2400 light years from earth. The shockwave of that explosion still travels with high speed into interstellar gas and makes it glowing brightly in red Halpha and blue OIII light.

These are the three components of the mosaic

And a few more nice crops:

Acquisition Details

Scope: Borg 90FL/500 with 1.08x Flattener
Filter: IDAS NBZ
Camera: ZWO ASI 2600MC Pro
Mount: Skywatcher HEQ5 Pro
Guiding Scope: MiniBorg 50
Guiding Camera: ZWO ASI 290MM
Guiding Software: PHD2
Acquisition Software: APT
Light Frames: 46x300sec for the Eastern and for the central part, 48x300sec for the Western part
Total integration time: 11h40m
Flats, Dark Flats, Bias, Darks
Camera settings: Gain 100, Offset 20
Bortle 4-5, between 60% and 70% moon
Acquisition Dates: July 18 & 20 & 29, 2021

Processing

PixInsight
Topaz AI Denoise
Gimp