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 6031
NGC 6031 is an open cluster of stars in the constellation Norma. It has a Trumpler classification of II 2p and an age of about (250 ± 100) × 106 years. The abundance of iron in this cluster matches the abundance in the Sun, indicating that the metallicity of the cluster is essentially solar.
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Wikipedia Page: NGC 6031
NGC 6031 at In-The-Sky website