NGC 6946 Fireworks (processing with subtraction (Ha - R))

The Fireworks Galaxy (NGC 6946) is located 22 million light-years away from us and has a diameter of about 40,000 light-years. It is found in the constellation Cygnus and on the border with the constellation Cepheus. The angular size of the galaxy is 11.5'x9.5'. The name Fireworks is associated with the abundance of bright regions of ionized hydrogen (HII).

Pixel math in the Siril program was used to isolate the H-alpha regions.