M13  globular cluster in constellation Hercules .Distance from Earth 22,200 light years.M13 is about145 light years in diameter with about 300,000 stars. Discovered by Edmond Halley in 1714 and catalogued by Chearles Messier on June 1-1764.
Picture instruments: Telescope RC Astrotech 6inches f/9 ,ccd 67 astro-physics reducer ,mount Skywatcher HEQ5pro  ,photo-camera Atik 314L+ monochrome exposures 10x 300sec Luminance filter.
Location Babadag Romania -9 april 2018 .The sky 70 % transparency.