Roche limit is a limit at which a planet tears apart a moon or object via tidal Forces

The formula for Roche Limit for a rigid object is $d = 2.44\; R_m\left( \frac {M_M} {M_m} \right)^{\frac{1}{3}}$

Where

$M_M$ is The mass of the primary or the planet.

$M_m$ is the mass of the secondary or moon.

$R_m$ is the Radius of the secondry or moon.

The formula for fluid objects is $d \approx 2.44R\left( \frac {\rho_M} {\rho_m} \right)^{1/3}$
Where

$R$ is the Radius of the primary or planet

$P_M$ is the Density of the primary or planet.

$P_m$ is the density of the secondry or moon.

Consider an orbiting mass of fluid held together by gravity, here viewed from above the orbital plane. Far from the Roche limit the mass is practically spherical.