NGC 6888 - The Crescent Nebula in Hydrogen Alpha (Hap Griffin)

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

NGC 6888 - The Crescent Nebula in Hydrogen Alpha, Hap Griffin

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NGC 6888 - The Crescent Nebula in Hydrogen Alpha

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NGC 6888 - The Crescent Nebula in Hydrogen Alpha

Powerful radiation winds blowing from the massive star, HD 192163 in the center of this photograph, created this nebula. About 400,000 years ago, HD 192163 expanded enormously to become a red giant and ejected its outer layers. 200,000 years later, the intense radiation from the exposed hot, inner layer of the star began pushing gas away at speeds in excess of 3 million miles per hour. Information gathered by the Chandra X-Ray satellite leads researchers to predict that HD 192163 will explode as a supernova in approximately 100,000 years.

NGC 6888 lies at a distance of 5000 light-years.

This image was captured through a narrowband filter admitting only a narrow slice of spectrum around the wavelength of glowing hydrogen. Thus it is a monochrome (single color) image displayed as shades of grey.

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	Basic success
Started	...
Astrometry.net job	1512684
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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NGC 6888 - The Crescent Nebula in Hydrogen Alpha

NGC 6888 - The Crescent Nebula in Hydrogen Alpha

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Image Index:

Contribution Index (beta):

NGC 6888 - The Crescent Nebula in Hydrogen Alpha

NGC 6888 - The Crescent Nebula in Hydrogen Alpha

Equipment

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Description

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