The planets in our solar system are thought to have come from

 The planets formed due to dust and gases combination.The general theory of formation of sun is also same like planet they both are formed by the gases and dust particle.

Accretion is the presently accepted method by which planets are formed .Initially only formed planets were formed they are mars ,venus ,mercury and earth .So we can say that all planets were formed from gases and dust.

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach