Very deep NGC 6946 (Colin McGill)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Fireworks Galaxy · NGC 6946

Powered byPixInsight

Very deep NGC 6946

Powered byPixInsight

Very deep NGC 6946

A very deep NGC 6946, 65 hours worth, including 5 hours of luminance from last year. The raw subs were excellent, with an average seeing of 1.8", and all shot under nearly moonless skies.

The extent of the galaxy is clear.

The first version of the galaxy was really posted in error - I forgot to convert to sRGB, so the colours look a little washed out. The second version I just converted to sRGB, but as Frank pointed out, this clipped the histogram a little.

For the final version, I wanted to try and accentuate the outer parts of the galaxy. First, I tried Rogelio Bernal Andreo's techniques from "Lessons from the Masters", but found that the galaxy was such a large part of the image that the central part of the galaxy also got enhanced brightness which reduced colour saturation.

The second attempt was much simpler - I just used the Curves tool to accentuate just the brightness range corresponding to the outer parts of the galaxy.

Finally, to get round the problem Frank pointed out, I applied the conversion to sRGB BEFORE I applied the final tweaks to the blackpoint to avoid clipping any unnecessary pixels.

Original
B
Final
C

Please note: The following tables are updated every 24 hours.

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
Image of the day
Top picks
Top pick nominations

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
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

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
Own remote observatory
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	Advanced success
Started	...
Astrometry.net job	3403129
PixInsight job	PYE4BGKPDAUNUHKISCQO30O0ISS4UVF6
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	20h34m51s.952
RA (top/left)	20h33m06s.408
RA (top/right)	20h36m37s.450
RA (bottom/right)	20h36m36s.179
RA (bottom/left)	20h33m07s.128

Dec (center)	+60°09′10″.39
Dec (top/left)	+60°19′25″.52
Dec (top/right)	+60°19′18″.70
Dec (bottom/right)	+59°58′49″.34
Dec (bottom/left)	+59°58′54″.33

Image Index:

Contribution Index (beta):

Very deep NGC 6946

Very deep NGC 6946

Equipment

Acquisition details

Description

Comments

Revisions

Sky plot

Histogram

		...
You have no new notifications.

Image Index:

Contribution Index (beta):

Very deep NGC 6946

Very deep NGC 6946

Equipment

Acquisition details

Description

Comments

Revisions

Sky plot

Histogram

Notifications

AstroBin is in READ ONLY mode

Sorry :-(

Sorry :-(

Sorry :-(

Are you really sure?

Warning!

Warning!

Are you sure?

Report abuse

Slideshow settings

IOTD/TP stats (last [x] days)

Distribution of astrophotographers

Distribution of subject types

Distribution of data sources

Sorry

Sorry

Share

Upload new revision

Upload uncompressed source (XISF/FITS/PSD/TIFF)

Delete image and all its revisions?

Delete original image?

Delete all other versions?

Delete all revisions?

Delete this revision?

Delete this revision?

IOTD/TP stats

The following people like this image

The following people bookmarked this image

Warning

Flag malfunctioning thumbnails

Contains

Remove yourself as a collaborator

Plate-solving information