SH2-221 (Sharpless 221 ) This large and dim nebula also has a couple of smaller Sharpless objects nearby, SH2-217 and Sh2-219 which both are seen in this image. Sh2-219 is the very small object next to SH2-221 and SH2-217 can be seen on the far right. Sh2-221 which is a supernova remnant spreads beyond this image on the top which gives you an idea of its size considering the field of view in this image is three by two degrees. The nebula responds well with the hydrogen-alpha filter to make a nice HA-RGB since it is most red. Nothing picked up with the green filter so I suspect this does make a good narrowband color image. For a complete list of the Sharpless Catalog visit my main site at http://www.sharplesscatalog.com