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Sharpless Catalog

(Sh2)
(catalog of HII regions found on Palomar plates)

The Sharpless Catalog is a list of HII regions assembled by Stewart Sharpless in the 1950s from Palomar Observatory Sky Survey (POSS) plates. The second/final edition of 1959 included 312 such nebulae (including all the earlier 1953 catalog other than two sources which had since been identified as something other than HII regions).

(catalog,clouds,HII)
Further reading:
https://en.wikipedia.org/wiki/Sharpless_catalog
https://ui.adsabs.harvard.edu/abs/1959ApJS....4..257S/abstract
https://ui.adsabs.harvard.edu/abs/1953ApJ...118..362S/abstract
http://www.sharplesscatalog.com/
http://galaxymap.org/cat/list/sharpless/1
https://www.astrobin.com/users/GaryI/collections/978/
PrefixExample  
SS 35short for Sh2-35
Sh1Sh1-891st catalog
Sh2Sh2-106or "Sharpless 106" or "Sh 106"
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