Dreyer, Johan Ludvig Emil

▪ Danish astronomer

born Feb. 13, 1852, Copenhagen

died Sept. 14, 1926, Oxford

 Danish astronomer who compiled the New General Catalogue of Nebulae and Clusters of Stars, published in 1888, and its supplements, published in 1895 and 1908. This work, together with the supplements, was republished in 1953; it still remains one of the standard reference catalogs.

      In 1874 Dreyer was appointed assistant at the Earl of Rosse's observatory in Parsonstown, County Offaly. Four years later he moved to Dunsink Observatory in Dublin. In 1882 he became director of the observatory at Armagh, Ire.; he retired from this post in 1916. That same year he was awarded the Gold Medal of the Royal Astronomical Society. He later served as the society's president (1923–24).

      In addition to his catalogue of nebulae and star clusters, Dreyer published a number of other astronomical works. He wrote a biography of his illustrious countryman, Tycho Brahe (1890), and collected and edited all of Tycho's works and correspondence in 15 volumes (published between 1913 and 1929).

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