NEW DISCOVERY – the Eye of OdinWhile imaging Fe 7 in Cassiopeia in Hα, I found this remarkable structure near the edge of the FOV after only a few hours at f/2. Faint, yes, but surely it had to be known?
Ha w/wo stars
I found nothing in HASH database and a faint CSPN showed itself in PanSTARRS DR1!
Encouraged, I pushed on with Oiii and found an even larger outer shell, with a sharper edge to the south-west giving the impression of movement. Its outer diameter is about 8 arcminutes.
Size comparasion Oiii - Ha
This potential PN has some remarkable depth, especially visible in the starless HOO image. The beautiful structure might resemble a marble, but to me it is a bit too dramatic to just be called "Marbles". As it also resembles an eyeball, I finally decided to name it
the Eye of Odin, in honor of our Norse God Odin and
the scary fate of his eye.The discovery is submitted to
@Pascal Le Dû for possible entry in the Eklund catalog in
the Planetary Nebula Database.
Animation
All exposures are unguided 120s at f/2 and binned 1x1. A
dynamic combination of Ha and Oiii was used, introducing less red than a normal HOO-palette does. Image is drizzled and cropped.
Ra: 00:53:54.86
Dec: 70:45:39.55
19h Ha
24h Oiii
Even though all captures and all the processing is mine, I must acknowledge my good friend and mentor @Peter Goodhew for his continuing support and advice. I do not always do what he suggest, but I always appreciate his advice. 
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