Do I remember that discovery!
Shortly after Hyakutake's discovery, but before an orbit was first published, comet Hale-Bopp was recovered in the morning sky following solar conjunction. I rang Gordon Garradd that same morning to congratulate him on the recovery, only for him to give me the unpublished orbital predictions for Hyakutake. That was an eye-opener. I think it was the following day that the IAU circular came out with the first published orbit.
For those of us who had never seen a Great Comet (the last being West in 1976), we were blessed with what was arguably a once-in-a-millennium apparation.
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