NGC6888 The Crescent Nebula (niteman1946)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent Nebula · NGC 6888

NGC6888 The Crescent Nebula, niteman1946

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NGC6888 The Crescent Nebula

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NGC6888 The Crescent Nebula

The Crescent Nebula, NGC 6888 (a.k.a. Caldwell 27, Sharpless 105) is an emission nebula and was formed by the fast stellar wind from the Wolf-Rayet star WR 136. This wind collided with, and energized a slower wind previously ejected when the star became a red giant 400,000 years ago. Results of this are a shell and two shock waves, with one moving outward and the other moving inward. The inboard shock wave heats the stellar wind to X-ray-emitting temperatures. The nebula is located about 5000 light years away in the constellation Cygnus. (Source Wikipedia).

The image was captured with a Meade 12"LX200 at F7.5, using the Canon XSi and Atik 383L+ mono cameras.

DSLR: The modified Canon 450D (XSi) produced a total of 150 subs at ISO1600 and 10 minutes each (25.0 hr) on 8/02 (8), 8/03 (27), 8/06 (18), 8/07 (31), 8/09 (2), 8/10 (33), and 8/11 (31).

CCD: The Atik 383L+ mono produced a total of 88 subs with binning 1x1 and 0C at 10 minutes each (14.67 hr) on 9/18 (17), 9/19 (24), 9/20 (25), 9/21 (9), and 9/22 (13).

Processing was done with PixInsight. This is a medium crop, due to differences in FOV between the two cameras -- North is up.

This was my second use of the Atik CCD. Again I combined the mono CCD image with the color DSLR image. This effort was a bit disappointing. It left the finished product looking over processed.

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	Distinct awarded users	Total awarded images
Image of the day
Top picks
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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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Distribution of data sources

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
Traveller
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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.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
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	Basic success
Started	...
Astrometry.net job	6455475
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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NGC6888 The Crescent Nebula

NGC6888 The Crescent Nebula

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