M13 (Peter Hannah)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: Hercules Globular Cluster · M 13 · NGC 6205

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M13

Revision title: M13 (2023 update)

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M13

Revision title: M13 (2023 update)

The great globular cluster in Hercules is a spectacular sight in northern skies. Lying at a distance of around 25,000 light years it contains several hundred thousand stars and is about 145 light years in diameter.

A few background galaxies are visible in the image. The brightest, identified when the mouse is moved over the image, is IC 4617, a 16th-magnitude Seyfert galaxy approximately 550 million light years away.

North is to the lower right in this image (PA=133 degrees). The famous three-bladed propeller feature is above centre in this orientation. With some effort, two of the three 'blades' (dark lanes) can be made out in the zoomed views.

Total exposure time 16 hours (4 each with LRGB filters). Exposures with the Lum filter had to be limited to 10 minutes to avoid saturating the core.

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Title: M13 (2023 update)

Description: Re-processed using original 2020 data with current PixInsight tools.

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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	8622457
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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M13

Revision title: M13 (2023 update)

M13

Revision title: M13 (2023 update)

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M13

Revision title: M13 (2023 update)

M13

Revision title: M13 (2023 update)

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