Sh 2-16
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Sh 2-16 is an emission nebula in the constellation Sagittarius. It is ionized by the star LSS 4381. The nebula also contains an infrared cluster, [DB2000] 56. It is at the same location as open cluster Collinder 347 which is located closer than the nebula.
The region appears mostly red in visible light, making observation best through a Hydrogen-alpha filter.