NGC 581/Related Articles
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- Cassiopeia : W-shaped constellation in the Northern Hemisphere between Andromeda and Cepheus, named after the wife of Cepheus king of the Ethiopians, in Greek mythology.
- Messier object : Systematic list of nebulae, galaxies, and star clusters, first compiled and published in 1771 by Charles Messier, it originally contained 45 objects, later superseded by the New General Catalogue (NGC).