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For questions about stellar explosions on white dwarfs caused by runaway fusion reactions in an accreted hydrogen atmoshphere and visible as a "new star". Distinct from a supernova.

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Assuming no light pollution, was "2C. 1406" ever visible to the naked eye?

I have at least a partial answer to your question: I'm doubtful that 2C 1406 corresponds to IC 4606, given the listed flux density. IC 4606 is an HII region, rather than a supernova remnant, and know …
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