Positions for about 5000 asteroid were computed for every day in a
given year for those reaching V = 16 or brighter. For a given asteroid and date, its position
was compared against the position on the same data for the remainig asteroids.
If an initial approach within 0.5° was found, a three position interpolation was used to find
the approximate time of closest approach. Then the perturbed positions for both asteroids were
computed at 1-minute intervals ±3 hours of the estimated time of closest approach. Interpolation
was used to find the exact date and time of minimum distance.
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