Other popular names in astronomy for the Hercules Globular cluster are : Messier 13 (M13) and NGC 6205. M13 was discovered by Edmond Halley in 1714, and catalogued by Charles Messier on June 1, 1764.
CCD
A charge-coupled device (CCD) is a device that records the movement of electrical charge, usually from within the device to an area where the charge can be manipulated, for example conversion into a digital value.