NGC 7009 "Saturn Nebula"

I was surprised to find concentric shells around this one, much like the <a href="http://hubblesite.org/newscenter/archive/releases/2004/27/image/a/" rel="nofollow">Cat's Eye Nebula</a> that is so famous. They are quite faint and were difficult to process but they should be easy enough to spot.

Processing notes: I combined the PC data with the rest of the WF data to create a partially more detailed image than without the PC data. The bad part of this is that I have a very hard time getting the two to match up no matter what I do and some parts of the PC data are actually less detailed. I sort of understand why but I don't understand it well enough to explain it better. I mix and matched it in a way I thought was both aesthetic and faithful to the object. Anyway, there are some faint lines visible across the image because of this.

Red: hst_11122_17_wfpc2_f658n_pc_drz + hst_11122_17_wfpc2_f658n_wf_drz + hst_08390_60_wfpc2_f658n_pc_drz Green: hst_11122_17_wfpc2_f656n_pc_drz + hst_11122_17_wfpc2_f656n_wf_drz Blue: hst_11122_17_wfpc2_f502n_pc_drz + hst_11122_17_wfpc2_f502n_wf_drz