AP#89 : NGC 6946/NGC 6939
Name:The "fireworks" galaxy
Constellation:Cygnus
Instrument:8-inch F5 reflector with Sky Watcher coma corrector and a modified Nikon D3300.
Exposure time: A stack of 16 five-minute exposures at ISO 800.
Star Chart from Michael Vlasov's Deep sky hunter star atlas available on line https://www.deepskywatch.com/deep-sky-hunter-atlas.html
Magnitude: 9.6 (NGC 6946) 7.8 (NGC 6939)
Apparent size: 16.0' X 11.2' (NGC 6946) 7' (NGC 6939)
NGC 6939 is an open cluster but the real target in this pair is NGC 6946, "The fireworks galaxy", which is a face-on spiral galaxy. It is called the "fireworks" galaxy because it has ten recorded supernova in the past 100 years.
