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The Details
M 15 Globular Cluster in Pegasus
Astro-Physics 12" Mak-Cass f/8
Astro-Physics 1600 Mount with absolute encoders
FLI 16803 Proline CCD
Tru-Balance LRGB filter set Gen 2
20 August 2015
Las Campanas Observatory, Chile
L 6 ea x 300 sec 1x1 bin, RGB 5 ea x 300 sec 1x1 bin
ACP, Maxim DL/CCD, , CCDStack 2, Photoshop CS5
Field of view: 51' x 51' centered on RA 21h30m01s
DEC+12°10'20" (2000). North angle 179.6°; east 90° CCW from north
The globular cluster M 15 lies about 36,000 light-years from Earth in the direction of the constellation Pegasus.  It spans nearly 175 light-years across and contains over 100,000 stars as well as a rare planetary nebula, Pease 1, named for its discoverer, the American astronomer Francis Pease.  M 15 has one of the densest concentrations of stars within its core region of any cluster in the Milky Way, with an estimated 30.000 stars within an 11 light-year radius of the center.  It has been suggested that this severe crowding at the center might be the result of a core collapse due to the mutual gravity of the great number of stars or possibly a black hole.




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