NGC 6946 is a barred spiral galaxy and has the nickname "Fireworks". It is 18 M ly distant in Cephus and Cygnus. It was discovered by William Herschel on September 9, 1798.
Details -
2016-11-30
20" f/4.1 telescope at the SDG observatory of Garry Sedun in Arizona.
TV Paracorr coma corrector and SBIG ST2000 XM camera.
Guidescope WO 80mm f/6.8 APO.
Mount - Paramount ME
Exposures - 13x240s for each of RGBL filters.
Processed in Images Plus and Photoshop.