NGC 6946 – Fireworks Galaxy- (Rouz Astro Reducer-OAG Kit)

NGC 6946 – Fireworks Galaxy- CDK14 – (Rouz Astro Reducer-OAG Kit)

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Imaging Telescopes Or Lenses : Planewave CDK14 (Rouz Astro Reducer-OAG Kit)
Imaging Cameras : QHYCCD QHY600PH M
Mounts : Astro-Physics 1100GTO
Filters : Astronomik Deep-Sky Blue 50 mm · Astronomik Deep-Sky Green 50 mm · Astronomik Deep-Sky Red 50 mm · Chroma H-alpha 3nm Bandpass 50 mm · Chroma LoGlow Light Pollution 50 mm
Accessories : Optec Gemini Rotating Focuser · Planewave Reducer 0.66x CDK12.5-14-17
Software : Pleiades Astrophoto PixInsight · Stefan Berg Nighttime Imaging ‘N’ Astronomy (N.I.N.A. / NINA)

Acquisition details

Dates : Oct. 3, 2022
Frames : Astronomik Deep-Sky Blue 50 mm: 45×300″(3h 45′)
Astronomik Deep-Sky Green 50 mm: 46×300″(3h 50′)
Astronomik Deep-Sky Red 50 mm: 42×300″(3h 30′)
Chroma H-alpha 3nm Bandpass 50 mm: 10×600″(1h 40′) (gain: 56.00)
Chroma LoGlow Light Pollution 50 mm: 117×300″(9h 45′) (gain: 0.00) -10°C bin 1×1
Integration : 22h 30′
Avg. Moon age : 7.92 days
Avg. Moon phase : 55.72%


NGC 6946 also knows as the Fireworks Galaxy is some 25 million light years from Earth. Its smaller than our galaxy, perhaps only a third of the size hosting about half as many stars.

This image captured some of the fainter outer regions of the arms as well as the presence of some Integrated flux nebulae (IFN) in the background.

The exposure was relatively long at 22hours with a relatively fast CDK14 operating at f/4.7. The QHY600m camera was used at gain 0 to maximize the full well capacity but in High Gain mode rather than 2CMS to simplify calibration.

Hydrogen Alpha data was captured at gain 56.Hydrogen alpha data captured by 3nm filters highlights the pink nebulosity in the spiral arms analogous to sparkling rubies.

Below is a starless version highlighting the IFN and surrounding gases:

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