M15 is a globular cluster located in a star-poor field off the tip of Pegasus' nose (the star Enif). It lies 33,600 light-years from Earth. It is a Shapley-Sawyer Class IV globular cluster, which have considerable scattering of peripheral stars, but their hallmark is that they still retain a small dense core of stars that cannot be resolved. However, the CDK17 was able to resolve M15 right down to the center of the core. The red giant and “blue strangler” stars, the latter of which are thought to be due to collision of stars forming “new” blue giants, are seen well in this image.

Exposures: LRBG=125:75:75:75 minutes = 5 hours, 50 minutes total exposure, completely unguided.