M15 (Gary Imm) - AstroBin

M15

M15 is a globular cluster located 34,000 light years away in the constellation of Pegasus at a declination of 12 degrees. It is a magnitude 6.3 cluster which spans 12 arc-minutes in our apparent view. This corresponds to a diameter of 120 light years.M15 contains over 100,000 stars and is a very dense globular cluster (Class of 8 out of 12). The cluster measures 120 light years across yet more than half of the stars are packed into the central area in a space just slightly more than ten light years in size. In this true color image, the majority of the stars are reddish in color, indicating cooler temperatures and consistent with this being one of the oldest know globular clusters. Detailed observations have identified that its core has undergone a contraction known as core collapse and the enormous number of stars in the cluster are surrounding what may be a central black hole.

The famous English naval officer and astronomer, Admiral William Henry Smyth, said this over two centuries ago about this object - "Although this noble cluster is rated as globular, it is not exactly round, and under the best circumstances is seen with stragglers branching from a central blaze. Under a moderate magnifying power, there are many telescopic and several brightish stars in the field; but the accumulated mass is completely insulated, and forcibly strikes the senses as being almost infinitely beyond. Indeed, it may be said to appear evidently aggregated by mutual laws, and part of some stupendous and inscrutable scheme of involution; for there is nothing quiescent throughout the immensity of the vast creation.”

ZWO ASI1600MM/QHY163M
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Status	Advanced success
Started	...
Astrometry.net job	3251724
PixInsight job	BG7SJ1E5QUE1JC8HXOQAKGUXUAFBDVQV
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	21h29m58s.848
RA (top/left)	21h27m56s.192
RA (top/right)	21h32m09s.933
RA (bottom/right)	21h32m01s.626
RA (bottom/left)	21h27m47s.342

Dec (center)	+12°09′48″.75
Dec (top/left)	+11°50′27″.72
Dec (top/right)	+11°54′11″.12
Dec (bottom/right)	+12°29′06″.66
Dec (bottom/left)	+12°25′22″.77

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