Gravitation Equations to Know

Fg=\frac{Gm1m2}{r^{2}}

g=\frac{Gm}{r^{2}}

Ug=-\frac{Gm1m2}{r}

Escape Velocity: \sqrt{\frac{2\cdot Gm}{r}}

Orbital Velocity:\sqrt{\frac{Gm}{r}}

T=\frac{2\pi r}{v}

v=\frac{2\pi r}{T}

r=\sqrt[3]{\frac{Gm}{4\pi^2}}