m: Mass of the satellite

G: Gravitational constant, 6.67408 × 10^-11 m³ Kg^-1 s

R: Radius of the earth

r: Distance from the planet's center to the satellite in orbit

The circular orbit at an altitude of from the center is 2R

Gravitational constant: The gravitational constant (G) is a physical constant represented by the symbol G and is used to calculate the gravitational force between two objects.

Radius of Earth: According to NASA the polar radius is 6356.752 Km, the Equatorial radius is 6378.137 Km, and the Volumetric mean radius is 6371 Km

Kinetic energy (KE) = 1/2 mv²

Gravitational potential energy (PE) = -GMm/r

Minimum energy required, E_min = 1/2 mv² - GMm/r = 5 GMm/6R

For example: if m=500 Kg, M is 5.9722×10²⁴ Kg, G is 6.67408 × 10^-20 Km³ Kg^-1 s (given in Km) and R is 6371 Km

Then,

E_min = 5 GMm/6R = 2.60679515094438E+44