Sh 2-20
Sh 2-20 is an emission nebula in the constellation Sagittarius. It is part of the Sharpless Catalog assembled by Stewart Sharpless. It lies next to the Sharpless objects Sh 2-15, Sh 2-16, Sh 2-17, Sh 2-18, and Sh 2-19. It contains the two infrared clusters, 5 and 6. It contains the radio source Seiradakis 36, of unknown origin.