SH2-157
Click on image for an enlarged view of the bright portion of this nebula
Cassiopeia
Above image down-sampled 0.5x
Penryn, California
September 200
FCL-90 II (ag, ST-4)
ST-10XME LRGB 5 minute subs
A HII emission nebula.
This is a ring nebula around WR 157, in the
Basel 3 (Markarian 50) cluster that is in turn part of Cas OB2., see http://galaxymap.org/cgi-bin/sharpless.py?s=151
