Messier 15 M15 NGC7078 Pegasus
M15 is a globular cluster in the constellation of Pegasus composed of more than 100,000 stars. It is 175 light years in diameter, 35,000 ly distant from Earth, and approximately 12 billion years old. Due to a central black hole, M15 has undergone contraction, or "core collapse", resulting in a highly dense interior. Extensively studied, the cluster has been found to have numerous variable stars, pulsars, a doule neuron star, and a planetary nebula - the first of only four so far discovered within globular clusters.
The image was taken with a Meade 8'' ACF telescope, Celestron Edge 8'' 0.7x tele-compressor, Celestron AVX mount, Orion SSAG pro 60mm F4 autoguider, Canon T3i full spectrum modified camera, and Astronomik CLS-CCD filter.
This reprocessed image is a stack of 12 x 90 sec exposures at iso 1600, 40 darks, 40 bias, processed with DSS, XnView, and StarTools, and Neat Image. Limiting magnitude is better than 17.5.
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