The New General Catalogue of Nebulae and Clusters of Stars (abbreviated as NGC) is a catalogue of deep-sky objects compiled by John Louis Emil Dreyer in 1888. The NGC contains 7,840 objects, known as the NGC objects. It is one of the largest comprehensive catalogues, as it includes all types of deep space objects, including galaxies, star clusters, emission nebulae and absorption nebulae.
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NGC 6717
NGC 6717 (also known as Palomar 9) is a globular cluster in the constellation Sagittarius, and is a member of the Palomar Globular Clusters group. Palomar 9 was discovered by William Herschel on August 7, 1784. It is located about 7,300 parsecs away from Earth. The globular cluster, which has an apparent magnitude of 9.28 and diameter of 9.9 arcminutes, is located just south of the star ν2 Sagittarii. The bright star region on the north-eastern edge has the separate designation IC 4802.
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Wikipedia Page: NGC 6717
NGC 6717 at In-The-Sky website