Location of Photo:
Pommier Observatory, Portland, OR, USA
Date/Time of photo:
2016-07-05 through 2016-07-14
Celestron Compustar C14 with Starizona LF reducer/corrector (f/7,5). SBIG STL 11000M CCD camera with Baader Planetarium L,R,G,B filters. Exposures: L:R:G:B = 100:100:100:100 minutes = 6 hours, 40 minutes total exposure.
M15 is a globular cluster in Pegasus, lying 32,000 light-years from Earth. It is a Shapley-Sawyer Class IV globular cluster, which means it has some scattering of its peripheral stars, but its hallmark is still that it has a dense core. In the case of M15, the core is intensely brilliant and very difficult to resolve. The goal of this image was to resolve the stars down into the dense core.