M15 Globular Cluster (schmaks)

Celestial hemisphere: Northern · Constellation: Pegasus (Peg) · Contains: M 15 · NGC 7078 · PK065-27.1 · PK065-27.2

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M15 Globular Cluster

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M15 Globular Cluster

Messier 15 or M15 is a globular cluster in the constellation Pegasus. It was discovered by Jean-Dominique Maraldi in 1746 and included in Charles Messier's catalogue of comet-like objects in 1764. At an estimated 12.0 billion years old, it is one of the oldest known globular clusters.

Messier 15 is one of the most densely packed globulars 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 a large number of variable stars (112) and pulsars (8), including one double neutron star system, M15 C. M15 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.

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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 success
Started	...
Astrometry.net job	3965466
PixInsight job	XM1Y94K0HHMTQQPI8PLRKFPV04SQONNM
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	21h29m58s.78
RA (top/left)	21h31m11s.87
RA (top/right)	21h31m11s.95
RA (bottom/right)	21h28m45s.52
RA (bottom/left)	21h28m45s.79

Dec (center)	+12°10′07″.8
Dec (top/left)	+11°43′18″.7
Dec (top/right)	+12°36′56″.2
Dec (bottom/right)	+12°36′55″.6
Dec (bottom/left)	+11°43′18″.3

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M15 Globular Cluster

M15 Globular Cluster

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M15 Globular Cluster

M15 Globular Cluster

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