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Sh2-54
Nebula in the constellation Serpens
Sh2-54 is an extended bright nebula in the constellation of Serpens.[1]
In its core there are many protostars and many infrared sources; some of these sources, like IRAS 18151−1208, are most probably very young high-mass stars.[4] The older star population in this region has an average age of 4–5 million years, and its components are grouped in the open cluster NGC 6604.[2]
Sh2-54 belongs to an extended nebulosity that includes also the Eagle Nebula and the Omega Nebula.[5] The young high-mass stars of this region constitute the Serpens OB1 and Serpens OB2 OB association.[2]