The radius of the Hill sphere is given in the adjacent table.
In contrast to true satellites, quasi-satellite orbits lie outside the planet's Hill sphere, and are unstable.
Jupiter is massive, with a surface gravity two and a half times that of Earth, so its Hill sphere is very large.
However, the Sun's Hill sphere, the effective range of its gravitational dominance, is believed to extend up to a thousand times farther.
The radius of the Uranus's Hill sphere is approximately 73 million km.
The binary's orbit is extremely close, at 650 km, compared to 35,000 km for the primary's Hill sphere.
An astronomical body's Hill sphere is the region in which it dominates the attraction of satellites.
To be retained by a planet, a moon must have an orbit that lies within the planet's Hill sphere.
That moon would, in turn, have a Hill sphere of its own.
All stable satellites of the Earth (those within the Earth's Hill sphere) must have an orbital period shorter than 7 months.