Another corker Mike! Amazingly enough I was just told about this object few days ago, a planetary nebula that is known since 1894 but no halo was found in a professional search in 1998. It seems Martin Pugh was the first one to first discover hints of a possible halo in 2012 (
http://asterisk.apod.com/download/fi...8608&mode=view) even if it was few months later in 2013 that Don Goldman confirmed the presence of the halo and showed it clearly:
http://astrodonimaging.com/gallery/ic-5148-with-halo/
At the end a great story of what determined amateurs with a good equipment can achieve!
Great shot!
Clear skies
Marco