M15 The Great Pegasus Cluster (Dale A Chamberlain)

Celestial hemisphere: Northern · Constellation: Pegasus (Peg) · Contains: M 15 · NGC 7078

M15 The Great Pegasus Cluster

Link: https://chamberlainobservatory.com/index.php/welcome-to-the-chamberlain-observatory-website/photo-gallery/m15-the-great-pegasus-cluster/

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M15 The Great Pegasus Cluster

Link: https://chamberlainobservatory.com/index.php/welcome-to-the-chamberlain-observatory-website/photo-gallery/m15-the-great-pegasus-cluster/

The Great Pegasus Cluster or Messier 15 or M15 (also designated NGC 7078) is a globular cluster in the constellation Pegasus. It was discovered by Jean-Dominique Maraldi in 1746 and included in Charles Messier's catalog of comet-like objects in 1764. At an estimated 12.5 billion years old, it is one of the oldest known globular clusters.

M 15 is about 35,700 light-years from Earth, and 175 light-years in diameter. It has an absolute magnitude of −9.2, which translates to a total luminosity of 360,000 times that of the Sun. Messier 15 is one of the most densely packed globular clusters known in the Milky Way galaxy. Its core has undergone a contraction known as "core collapse" and it has a central density cusp with an enormous number of stars surrounding what may be a central black hole.

Home to over 100,000 stars, the cluster is notable for containing many variable stars (112) and pulsars (8), including one double neutron star system, M15-C. It also contains Pease 1, the first planetary nebula discovered within a globular cluster in 1928. Just three others have been found in globular clusters since then. (Courtesy Wikipedia)

The OSC Club (One Shot Camera)
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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
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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
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Public amaeteur data
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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	Advanced failed
Started	...
Astrometry.net job	6035001
PixInsight job	4OQRGTQJZW0Z0IDIFEAK4XYPMELEYASX
PixInsight queue size	n/a
PixInsight stage	PLATE_SOLVING_IMAGE

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M15 The Great Pegasus Cluster

M15 The Great Pegasus Cluster

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M15 The Great Pegasus Cluster

M15 The Great Pegasus Cluster

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