NGC6888 Crescent Nebula LRGB (Richard Francis)

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

Powered byPixInsight

NGC6888 Crescent Nebula LRGB

Powered byPixInsight

NGC6888 Crescent Nebula LRGB

The Crescent Nebula (designated NGC6888) lies about 5000 light-years away, and it is about 25 light-years across. At its centre is a bright blue star, an unusual type of star called a Wolf-Rayet star, which is very massive, hot and intrinsically luminous. Wolf-Rayet stars are a late stage in the life of very massive stars, after passing through a red supergiant phase. Being massive, they have short lifetimes. This one, called WD136, is estimated to be only 4.7 million years old, about a thousand time less than the age of our Sun. It has only a short lifetime ahead, as it is expected to explode as a supernova within a few hundred thousand years.

When WR136 was a red supergiant, about 120,000–240,000 years ago, it blew off a shell of gas travelling at a speed of about 80 km/s and this is still expanding. When it became a Wolf-Rayet star it started emitting a very fast stellar wind due to its extremely high temperature, in which gas is ejected at about 1,700 km/s: a characteristic of these stars. The collision of these streams of gas is energising it and causing it to emit light, which is what we see as this glowing shell-like structure.

This object is set in the Milky Way in the sky, and this is clear from the density of stars around it.

Total exposure: 5h 40m, between 12 and 16 Aug 2018

Filters:

Red: 10x 600 sec

Green: 8x 600 sec

Blue: 8x 600 sec

Luminance: 8x 600 sec

Original
B
Final
C

B

Description: I found I'd made an error in conversion to non-linear, which affected the colours. This is now corrected in this version.

Uploaded: ...

C

Description: And now with a bit more saturation

Uploaded: ...

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	2222777
PixInsight job	AROYTAE6HIXAWZSQUBM4LSPTMAZRY775
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	20h12m05s.698
RA (top/left)	20h11m05s.205
RA (top/right)	20h11m05s.907
RA (bottom/right)	20h13m05s.648
RA (bottom/left)	20h13m06s.680

Dec (center)	+38°21′08″.91
Dec (top/left)	+38°36′49″.80
Dec (top/right)	+38°05′26″.92
Dec (bottom/right)	+38°05′27″.81
Dec (bottom/left)	+38°36′48″.30

Image Index:

Contribution Index (beta):

NGC6888 Crescent Nebula LRGB

NGC6888 Crescent Nebula LRGB

Equipment

Acquisition details

Description

Comments

Revisions

B

C

Sky plot

Histogram

		...
You have no new notifications.

Image Index:

Contribution Index (beta):

NGC6888 Crescent Nebula LRGB

NGC6888 Crescent Nebula LRGB

Equipment

Acquisition details

Description

Comments

Revisions

B

C

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