NGC6939 & NGC6946

Image information:

Date: 08/14/2021
Equipment: Moravian C1+ 12000A camera through APM/LZOS 105/650 APO telescope with IDAS HEUIB-II filter on Losmandy GM8 mount. The telescope was working at f6.2 with Astro-Tech 2" field flattener.
Image type: OSC
Exposure time: 80X180s, gain 40.

Object information:

Object designations:

  • NGC6939
  • NGC6946; Fireworks Galaxy
Object type:
  • NGC6939 - Open cluster
  • NGC6946 - Spiral galaxy
Object size:
  • NGC6939 - 8'
  • NGC6946 - 11'X10'
Constellation: Cepheus / Cygnus border

NGC6946 is big spiral galaxy rather close to us. It is only 10 million light years away, with diameter of some 40 kly. The galaxy is much dimmer, and its light is redder then it would be normal because of thick clouds of obscuring foreground interstellar dust. NGC6946 is very active galaxy noted for high rate of star birth and death. In last hundred years at least 9 supernovae were detected in it. That galaxy is sometimes called Fireworks Galaxy.

NGC6939 is an open cluster consisting of some 80 stars. It is 5800 ly distant. Its light is also dimmed by obscuring clouds of interstellar dust.

Related images:

List of related images:

NGC6939 & NGC6946, LRGB, ST2000XM through WO ZS105ED telescope