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Sharpless Catalogue
The Sharpless catalogue is a list of 313 H II regions (emission nebulae). H II regions are clouds of ionized hydrogen gas that glow because of the radiation from nearby hot stars. The catalogue was compiled by the American astronomer Stewart Sharpless in two editions, published in 1953 and 1959. Sharpless used the images from the Palomar Sky Survey to identify and catalog the H II regions. He also included some planetary nebulae and supernova remnants in his catalogue, but some of them were later removed by other astronomers.
This gallery is a collection of astrophotography from the Sharpless catalogue.
Some objects may be associated with multiple catalogues.