Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Fireworks Galaxy  ·  NGC 6946
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NGC 6946 - Fireworks Galaxy (2795 subs), David Andra
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NGC 6946 - Fireworks Galaxy (2795 subs)

Getting plate-solving status, please wait...
NGC 6946 - Fireworks Galaxy (2795 subs), David Andra
Powered byPixInsight

NGC 6946 - Fireworks Galaxy (2795 subs)

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Description

NGC 6946, the Fireworks Galaxy, was captured in HaRGB as an experiment with short subs . Light pollution, wind gusts, and autoguiding at long focal lengths present a continuous challenge. Shooting shorter subs was one potential remedy so  I used an EdgeHD 11 (fl=2800 mm, F10), unguided, with only 20s subs in RGB and 60s subs of Ha. The sub lengths were chosen as a balance between factors causing blur at fl=2800 mm versus having the subs long enough to cope with F10. All told, about 16 hours of data were integrated using 2795 subs (out of ~3200 before culling). The stack was slightly cropped to remove edge overlap. Sub count: 136 Ha, 991 red, 930 green, 738 blue].

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NGC 6946 - Fireworks Galaxy (2795 subs), David Andra

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Central USA