M27 - The Dumbbell Nebula (Peter Hannah)

Celestial hemisphere: Northern · Constellation: Vulpecula (Vul) · Contains: Dumbbell Nebula · M 27 · NGC 6853

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M27 - The Dumbbell Nebula

Link: https://astroworkshop.com/m27/

Powered byPixInsight

M27 - The Dumbbell Nebula

Link: https://astroworkshop.com/m27/

This is an Hα RGB image of M27. That is, a conventional Red-Green-Blue (RGB) colour composite has been enhanced with an H-alpha narrowband image added to the Luminosity channel. The H-α has revealed considerably more detail in the structure of the expanding shell.

Historically these objects were called planetary nebulae because some of them resemble planets when viewed visually through a telescope. However in reality they are shells of expanding gas thrown outward by a star nearing the end of its life. Stars of similar mass to the Sun spend most of their lives burning hydrogen in their cores, but once this is depleted they start helium fusion, though hydrogen continues to burn in a shell of gas surrounding the core.
These processes increase the temperature of the star’s surface, resulting in a powerful stellar wind that causes the outer envelope of the star to expand into space. Initially this shell may be seen as a relatively dim proto-planetary nebula, often displaying concentric rings of gas, but once the surface temperature of the star reaches 10,000K the radiation is able to ionize the hydrogen in the shell, and it is this that gives rise to the glow of the nebula.
Planetary nebulae are among the shorter-lived stellar phenomena, usually lasting only around 20,000 years. Our Sun will probably produce one as it nears the end of its life.

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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	8303889
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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M27 - The Dumbbell Nebula

M27 - The Dumbbell Nebula

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M27 - The Dumbbell Nebula

M27 - The Dumbbell Nebula

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