What is the formula for specific potential energy?

The specific energy (energy per unit mass) of a space vehicle is composed of two components, the specific potential energy and the specific kinetic energy.

The formula for specific potential energy associated with a planet of mass M is given by

ϵ_p = − universal gravitational constant ×Mass / distance

ϵ_p = − GM / r

 ϵ_p = specific potential energy

G = the universal gravitational constant (G = 6.67×10−11 m3 kg−1 s−2),

M = the mass of the body to be escaped

r = distance from the centre of mass of the body to the object.