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SH2-161                       
Cassiopeia
Penryn, California
September 2007/2009
FCL-90II @ f4.5 (ag, ST-4)
ST-10XME, RGB 5 minute subs, lum 10 minute subs 2009

A large diffuse HII region surrounding the smaller star forming nebula NGC 7538 (Sh2-158)