BETA ZEN
Sharpless catalog
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The Sharpless catalog is a list of 313 H II regions intended to be comprehensive north of declination −27°. The first edition was published in 1953 with 142 objects (Sh1), and the second and final version was published by US astronomer Stewart Sharpless in 1959 with 312 objects. Sharpless also includes some planetary nebulae and supernova remnants, in addition to H II regions.