Sharpless Catalogue
The Sharpless Catalogue was created in the 1950s by American astronomer Stewart Sharpless and focuses specifically on H-alpha emission nebulae within the Milky Way. The 312 Sharpless objects are large clouds of ionized hydrogen associated with regions of active or recent star formation. Sharpless objects are often very faint visually but can be spectacular in astrophotography, particularly when using narrowband filters.
