SH2-54 Core Nebula in the Constellation of Serpens

Sh 2-54 is an extended bright nebula in the constellation of Serpens.

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. 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