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NGC 246 (PK 118-74.1)
Penryn, California
September 2008
FS-128  (ag, ST-4)
ST-2000XM LRGB 5 minute subs

NGC 246 is a bi-polar pulsating planetary with ~72 minute pulsation rate.  A cavity within the nebula and an outer envelope shield the planetary from the ISM resulting in cool photo ionization of planetary material.  (Hoogerwerf, - 2007)