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.
Know more about NGC
NGC 6553
NGC 6553 is a globular cluster in the constellation Sagittarius. NGC 6553 has an apparent magnitude of about 8th magnitude with an apparent diameter of 8.2 arcminutes. Its Shapley–Sawyer Concentration Class is XI, meaning the star concentration is very loose even at the center; it has stars of magnitude 20 and dimmer. It is located just over a degree southeast of Messier 8, the Lagoon Nebula. Unlike common globular clusters, NGC 6553 is relatively metal-rich, and there is evidence of at least two periods of star formation. Due to a complex star-forming record, the stars in the cluster are differing in composition, most notably in concentrations of sodium and aluminium. NGC 6553 is very similar in composition to NGC 6528, suggesting an origin in a similar environment.
More Images:
Sources:
Wikipedia Page: NGC 6553
NGC 6553 at In-The-Sky website