Two bodies share such a zone if their orbits ever cross each other, if their orbital periods differ by less than a factor of 10, and if they are not in a stable resonance.

• 当两个天体的轨道互相交错、轨道周期相差不到10倍，并且不是处于稳定的共振状态，那麽两者就是共有一个轨道区域。