We analyzed a sample of 139 NEAs with the same orbital characteristics
as the JFCs, namely Tisserand parameters 2 < T < 3, and
orbital periods P < 20 yr. Furthermore, we imposed the condition
that they are Jupiter-approaching or crossing objects, namely with
aphelion distances Q > 4:8 au. We also restrict the sample to those
orbits of better quality, as given by the condition codes 65 in the
JPL scale 0–9 (from the best to the poorest quality). For comparison
purposes, we also studied a sample of 42 NEJFCs in orbits with the
same constraints as those for the asteroid sample.