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Interesting, but the magnitude list is a bit deceptive: "in a dark sky". How defined? Ikeya Seki's nucleus was easily brighter than mag 0 when the sky was quite dark, with just a trace of twilight on the eastern horizon, on Oct 31 1965, yet it's listed as mag 2, and on Oct 14, 7 days before(!) perehelion, so I think whoever compiled the list was a a bit arbitrary. Take with a grain of salt.
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