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In all probability, there may be another as-yet-undiscovered naked-eye comet before then. On average, there is a comet of 6th magnitude or better every year or so, a comet of 4th magnitude or better every 2 years, a comet of 2nd magnitude or better every 5 years, and a comet of 1st magnitude or better every 10 years. That's the long-run average, which takes into account droughts and deluges.
Greg
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