26 4-minute lights plus calibration frames were stacked using ImagesPlus; other post-processing used Photoshop CS2 plus Astronomy Tools plugin, Siril, and PhotoScape X

Messier 13, also known as the Hercules Globular Cluster, is a large globular star cluster in the constellation Hercules. Messier 13 is 145 light years across and contains about 300,000 stars. It is 22,200 light years from Earth.