M13 - Hercules globular cluster (Stijn)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: Hercules Globular Cluster · M 13 · NGC 6205 · NGC 6207

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M13 - Hercules globular cluster

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M13 - Hercules globular cluster

Globular clusters are mysterious things, containing some of the oldest surviving stars in our universe and their origin still being under debate.

The Hercules globular cluster is located around 22000 light years away from us. Estimates go between 300000 and 500000 stars being bound within this cluster. The Hercules cluster contains both hot (blue) and cool (red) stars, and is estimated to be 12 billion years old.

The picture also contains a few background galaxies, the brightest one being found towards the extreme left. I'm very happy to have captured IC 4617, which is somewhere around 500 million light years away!

This picture was deliberately taken with high care for sharp focus and good collimation, both of which are crucial to resolve the stars within the cluster. Many short exposures were taken to avoid colour saturation in the stars. I don't know whether this was really needed, but it didn't hurt either :-).

Astrophotographers of Belgium

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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
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Star trails
Northern lights
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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
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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	7934839
PixInsight job	n/a
PixInsight queue size	n/a
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M13 - Hercules globular cluster

M13 - Hercules globular cluster

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M13 - Hercules globular cluster

M13 - Hercules globular cluster

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