Crescent Nebula (JMDean)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent Nebula · HD192003 · HD192020 · HD192041 · HD192078 · HD192102 · HD192123 · HD192163 · HD192182 · HD192303 · HD192361 · HD192422 · HD192443 · HD192444 · HD192537 · HD227991 · HD228003 · HD228018 · HD228051 · HD228066 · HD228067 · HD228077 · HD228099 · HD228139 · HD228152 · HD228153 · HD228163 · HD228185 · HD228186 · HD228198 · And 35 more.

Powered byPixInsight

Crescent Nebula

Powered byPixInsight

Crescent Nebula

The Crescent Nebula with the Cygnus Bubble Nebula at the top.

This is one of the most difficult images I have processed to date. Trying to stretch the Ha and Oiii in the presence of so many stars and trying to keep the correct balance between the Ha and Oiii. I hope to add this to some RGB in the near future.

23 x 15min Ha

30 x 15min Oiii

Mapped to RGB as: R = Ha; G = 0.2xHa + 0.8xOiii; B = Oiii.

The Crescent Nebula (NGC6888) is an expanding shell of hydrogen gas measuring16x25 light years across. It is illuminated by a central brilliant Wolf-Rayet star (WR 136); 15 times more massive than our sun and about 3.3 times larger.

WR 136 blew off a shell of material when it became a red supergiant around 120,000-240,000 years ago. The powerful high velocity stellar wind (3.8 million mph) associated with this Wolf-Rayet star is catching up with the material shed from the star and shaping it into a growing expansion shell of shed material, rich in hydrogen and oxygen.

Original
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	3972910
PixInsight job	VT5FXICA7B7LUXCO67Z6RUH9LPGSMDH2
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	20h12m07s.57
RA (top/left)	20h14m31s.66
RA (top/right)	20h14m54s.12
RA (bottom/right)	20h09m40s.20
RA (bottom/left)	20h09m23s.76

Dec (center)	+38°17′58″.5
Dec (top/left)	+37°39′28″.4
Dec (top/right)	+38°53′05″.2
Dec (bottom/right)	+38°56′14″.6
Dec (bottom/left)	+37°42′37″.5

Image Index:

Contribution Index (beta):

Crescent Nebula

Crescent Nebula

Equipment

Acquisition details

Description

Comments

Revisions

Sky plot

Histogram

		...
You have no new notifications.

Image Index:

Contribution Index (beta):

Crescent Nebula

Crescent Nebula

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?

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