NGC 6946, (also known as the Fireworks Galaxy), is an intermediate spiral galaxy about 18 million! light-years away in the constellations Cepheus and Cygnus. NGC 6946 is highly obscured by interstellar matter of the Milky Way galaxy.
In the past century, eight supernovas have been observed to explode in the arms of this galaxy, hence the name "Fireworks Galaxy".

Below right is the open star cluster, NGC 6939.

 

Technical info:
TS 80mm f6 APO triplet refractor - Canon 40D + IDAS LPS2 (light pollution) filter - exposure 50x 120sec (1uur 40min)