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I find it hard to imagine being able to visually observe PN as far away as 150-200,000 light years even with a 20" scope. In putting together the charts for Clouds of Magellan I have not encountered observable planetaries. But I would love to include a list or put them on the charts if there are visually observable PNs. With the SMC in particular, many of the open clusters are quite small visually (1' or less), let alone PNs.
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