 The key difference between a satellite and a quasi-satellite is that the orbit of a satellite of Earth fundamentally depends on the gravity of the Earth–Moon system, whereas the orbit of a quasi-satellite would negligibly change if Earth and the Moon were suddenly removed because a quasi-satellite is orbiting the Sun on an Earth-like orbit in the vicinity of Earth.Earth possesses one known trojan, a small Solar System body caught in the planet's gravitationally stable Lagrangian point.This object, , is roughly 300 metres across.