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This page allows to use the Backward Integration Method (BIM) to follow the past orbital evolution of secular angles, longitude of ascending node and argument of perihelion, in order to estimate age of an asteroid family. To performe this task you should provide a list of asteroids, either in the box below or from a file. In case you are uploading your file, it should contain the list of asteroids in the first column.
Enter asteroids' numbers here
OR
Upload file with asteroids:

Only stable orbits
Lyapunov time [kyr]