Helix Nebula (Warren A. Keller)

Celestial hemisphere: Southern · Constellation: Aquarius (Aqr) · Contains: Helix Nebula · NGC 7293

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Helix Nebula

Link: http://www.billionsandbillions.com/helix.html

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Helix Nebula

Link: http://www.billionsandbillions.com/helix.html

NGC 7293 in Aquarius is an enormous planetary nebula (PN) discovered by Karl Ludwig Harding in 1823. Estimated at 2.5 light-years across, NGC 7293 is one of the largest of its class. At 700 light-years distance, the Helix, also referred to as The Eye of God is a young object, believed to have formed a mere 6,560 years ago. The Helix was the first planetary nebula found to contain cometary knots which radiate from the dying central star. The name 'cometary' derives from their bright cusps and tails. PNs are often characterized by their pink H-alpha and teal Oxygen 3 components. The principal portion of the nebula was imaged by SSRO. I am extremely grateful to the Italian imaging team of Piermario Gualdoni and Alessandro Cipolat Bares for providing the wonderful bow-shock at bottom, and the wider star field, and to Mike Selby for additional Hydrogen-alpha data.

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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	6557711
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Helix Nebula

Helix Nebula

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Image Index:

Contribution Index (beta):

Helix Nebula

Helix Nebula

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