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

All Images
Nebulae

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Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
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Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
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Star trails
Northern lights
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This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
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Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced success
Started	...
Astrometry.net job	5207235
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

Crescent - CDK reducer first light

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Image Index:

Contribution Index (beta):

Crescent - CDK reducer first light

Crescent - CDK reducer first light

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Description

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Revisions

Sky plot

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