Oligarchic growth commences when the velocity dispersion relative to the largest body’s Hill velocity takes its minimum.

Planetary mass at the onset of oligarchic growth is close to the masses of the dwarf planets.

Size distribution of KBOs is reproduced if the initial planetesimal mass is 10²¹g.

Size distribution of asteroids is reproduced if initial planetesimals are very small and the asteroid seed mass is 10¹⁹g.