Crescent - CDK reducer first light (Rouz Astro)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent Nebula · LBN 203 · NGC 6888 · Sh2-105

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Crescent - CDK reducer first light

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Crescent - CDK reducer first light

The Crescent Nebula

An emission nebula about 5000 light-years away from Earth.
The result of the collision is a shell and two shock waves, one moving outward and one moving inward. The inward moving shock wave heats the stellar wind to X-ray-emitting temperatures.
This "narrowband" image captures Ionized Hydrogen (red) and Oxygen (blue-green)

Technical:
First light with the CDK 0.66x reducer

With limited clear dark skies available, I've been trying to maximize the system efficiency and "speed".

The CDK 12.5 (318mm aperture) is now operating at fast focal ratio of f/5.25 and a focal length of 1670mm.

The image scale is still under 1 arcsecond/pixel (binned) which was my target given the seeing here is typically 2.4 to 2.6 arc seconds.

The QHY268m performs admirably here.

The smaller pixels are binned 2x to create 7.5 micron pixels to further increase the signal.

Its extremely low read noise of only 1.5e coupled with the very high QE of 92% allows for

very fast and clean data capture.

The 16bit ADC, almost negligible dark current and the lack of amp glow are added bonuses!

Moderate light pollution also is an issue and the 3nm narrowband filters help block out much of the unwanted light.

Original
D
E
Final
G

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Nebulae

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Status	Advanced success
Started	...
PixInsight job	TP1BLHJBF74ZZE0GYJHH1UH66BWRO3FP
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	20h12m08s.961
RA (top/left)	20h10m48s.619
RA (top/right)	20h10m44s.969
RA (bottom/right)	20h13m28s.545
RA (bottom/left)	20h13m34s.530

Dec (center)	+38°21′16″.63
Dec (top/left)	+38°45′44″.48
Dec (top/right)	+37°57′25″.38
Dec (bottom/right)	+37°56′51″.00
Dec (bottom/left)	+38°45′07″.40

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Crescent - CDK reducer first light

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Crescent - CDK reducer first light

Crescent - CDK reducer first light

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