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Sh2-54 is an extended bright nebula in the constellation of Serpens.〔(【引用サイトリンク】 work=Results for Sh2-54 )〕 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. The young high-mass stars of this region constitute the Serpens OB1 and Serpens OB2 OB association.〔 == See also == *H II region *Eagle Nebula *Omega Nebula 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sh2-54」の詳細全文を読む スポンサード リンク
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