Fireworks Galaxy & Ghost Bush Cluster
The Fireworks Galaxy (NGC 6946) and the Ghost Bush Cluster (NGC 6939) form one of the most striking deep-sky pairings in the constellation Cepheus. Although they appear close together in the night sky, they are separated by an enormous distance in space: NGC 6946 lies approximately 22 million light-years from Earth, while NGC 6939 is a relatively nearby open cluster only 3,800 light-years away. The Fireworks Galaxy is renowned for its exceptionally high rate of star formation and has hosted numerous observed supernovae over the past century, earning it its explosive nickname.
The Fireworks Galaxy was the very first galaxy I ever imaged, making this target especially meaningful to me. Although my first attempt looked nothing like the image presented here, I still remember the excitement of watching the galaxy gradually emerge on my computer screen during the live stack. That moment was a turning point in my astrophotography journey. Years later, I returned to the same object with more experience, improved equipment, and significantly more integration time. Despite being captured entirely under the heavily light-polluted skies of Athens, this has become one of the images that I enjoy the most. I hope to revisit the Fireworks Galaxy again in the future from a much darker location to reveal even more of its delicate structure and faint outer details.
OBJECT INFORMATION
| Name/Designation | NGC 6946 (Fireworks Galaxy) & NGC 6939 (Ghost Bush Cluster) |
| Object Type | Spiral Galaxy / Open Star Cluster |
| Constellation | Cepheus |
| Distance |
NGC 6946: ~22 million light-years NGC 6939: ~3,800 light-years |
| Apparent Magnitude |
NGC 6946: ~9.6 NGC 6939: ~7.8 |
| Angular Size |
NGC 6946: ~11′ NGC 6939: ~8′ |
IMAGING
| Date | October 9–12, 2023 |
| Location | Athens, Greece |
| Frames | 583 × 60″ exposures |
| Integration | 9h 55m |
| Camera Settings | Gain 101 | Temperature: 0°C |
| Bortle Scale | 8/9 (City sky) |
EQUIPMENT
| Telescope | Sky-Watcher Explorer 130PDS |
| Camera | ZWO ASI533MC Pro |
| Mount | Sky-Watcher EQ5 Pro |
| Filter | Baader UV/IR Cut Luminance |
| Accessory | Baader 2″ MPCC Mark III |
| Guide Scope | Artesky 32mm Mini |
| Guide Camera | ZWO ASI120MM Mini |
SOFTWARE
| Acquisition | Astro Photography Tool |
| Guiding | PHD2 Guiding |
| Processing | PixInsight |
| Plugins | RC Astro |