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. In the case of M15, the dense core is intensely bright, and has distinctly triangular shape outlined by dark lanes, one of which is remarkably linear.  LRBG=100:100:100:100=6 hours 40 minutes total exposure.

This image was published in the January, 2014 issue of Astronomy Magazine.