Crescent Nebula in Bicolor (Jonathan Piques)

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

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Crescent Nebula in Bicolor

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Crescent Nebula in Bicolor

This jellyfish-looking bubble is the Crescent Nebula, a cloud of super-hot gas about 25 light-years across, located about 5,000 light years distant in the constellation Cygnus. This image comprises about 24 hours worth of 5 minute exposures from my back patio, using filters that isolate light from hydrogen and oxygen atoms. The oxygen produces the blue envelope that surrounds and permeates the nebula. At the center of the nebula is as a massive Wolf-Rayet star (WR 136) that is shedding its outer layers in a extremely strong stellar wind, ejecting the equivalent of the Sun's mass every 10,000 years. The nebula's unique shape is likely the result of this shock wave of gas interacting with material ejected in an earlier phase. These are the death throes of the central star, and should ultimately culminate in a supernova explosion at some point in the future. This is the first of a few astrophotography images to come: I’ve got a backlog of imaging data to process. For now, enjoy this oddity: it’s one of my favorite objects.

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	3679417
PixInsight job	RKPPZ2S1J8Y8K9RFI7GSFKJW7OLQR22T
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	20h12m14s.169
RA (top/left)	20h14m41s.429
RA (top/right)	20h13m21s.566
RA (bottom/right)	20h09m45s.468
RA (bottom/left)	20h11m07s.873

Dec (center)	+38°20′06″.76
Dec (top/left)	+37°58′27″.78
Dec (top/right)	+38°53′47″.43
Dec (bottom/right)	+38°41′34″.73
Dec (bottom/left)	+37°46′24″.59

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Crescent Nebula in Bicolor

Crescent Nebula in Bicolor

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Crescent Nebula in Bicolor

Crescent Nebula in Bicolor

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