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We may have a problem if this object is at the same distance as NGC6822 in true terms. Given the distance to NGC6822 (1.63 million ly), that would make the object 158 light years across (at 20"). Way too big for a planetary. It would actually be a large nebula...at least 5x the size of Orion. Not only that, it would have absorption lines. If it's a planetary, it's a lot closer. Maybe it's a planetary of a halo star or your normal run of the mill star in the Galaxy, but a long way off.
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