M13-is a globular cluster of about 300.000 stars and is located in Hercules constelation.,about 25.000 light years from Earth . M13 was Discovered by Edmond Halley in1714 bat is catalogued by Charles Messier in one June 1-1764.
telescop-65mm quadruplet apochromatic
mount-Skywatcher HEQ5pro guided
camera photo-Atik314L+color ccd
guiding-camera-Zwo ASI1200mm Monochrome PHD2 guiding
guide-scope -Skywatcher 70/500 mm
filters UHC
exposures- 4x300 sec.,5x500sec.
location Santorini-Greece