astrophotographer and RASC member, Kathy Walker, gave me the idea for
this shot with her marathon 18
hour narrow band image
of the same
target. These two are dim, with Abel-6 (upper left) is listed at
magnitude 15 while HFG-1 is estimated st 20. Personally I think the
HFG-1 estimate is off as it seems to be both brighter and larger than
Abel-6 making its integrated magnitude of 20 a little questionable.
Abell-6 and HFG-1 are two planetary nebulae in Cassiopeia. HFG-1 was formed by a binary star system (V664 Cas) that is moving rapidly through the interstellar medium creating the unique bow shock seen in the image.
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