Celestial Body

Mass (Kg)

Orbital radius of the secondary

Hill Radius

Radius of the Gravitational Sphere of influence of the celestial object

Sun

1.99³⁰

4.37ly

Of Sun w.r.t. P.Centauri is 2.87 ly

2.87 ly

Proxima Centauri

2.446²⁹

4.37ly

Of P.Centauri w.r.t. Sun is 1.5 ly

1.5 ly

Earth

5.9736²⁴

1AU

Of Earth w.r.t. Sun 0.01 AU =

1,496,280 Km

Earth’s gravitational extent is 0.01 AU hence Moon is within Earth’s gravitational influence.