It's been a while since I've studied any physics, but this looks odd to me.
RE = 6378.137e3 ; % m - radius of earth
RS = 500e3; % m - orbital altitude
R = (RE+RS); % m
mE = 5.972e24; % kg
G = 6.6743e-11; % m^3/kg s^2
By dimensional analysis, K has units of or times whatever the unit of 3 is. If that's supposed to be the gravitational force between a 3 kg satellite and the Earth, shouldn't that be over R^2 (which would give Newtons, ) instead of over R^5?
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