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Just a comment for comparison - Hyakutake in 1996 also came a fairly close 15 million kms.
Comets can come closer - if you look at the history of Comet Halley and Comet Encke those figures you quote above are large. There have been at least three times in the last few thousand years that comets have passed by the Earth at a closer distance than the moon i.e. within 384,000km. Now that's close!
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