Sh2-54 [SEP] constellation
Sh2-54
Sh2-54 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 millions years, and its components are grouped in the open cluster NGC 6604.
Sh2-54 belongs to an extended nebulosity that includes also the Eagle Nebula and the Omega Nebula
Sh2-201
Sh2-201 is an emission nebula in the Cassiopeia constellation. It is in the eastern part of the constellation along the eastern border of the IC 1848. The nebula is 9980 light-years away from Earth. It is also seen close to Sh2-199.