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Derek Santiago | all galleries >> Galleries >> Planetary Nebulae and SN Remnants > M57 with OIII
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M57 with OIII

There are reports and images (Ken Crawford) of a faint outer OIII halo. So I spent an evening adding six hours of OIII (30 minute subs bin x 2). It does indeed appear to sit in faint bed of ionized oxygen.

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