User:T.Randall.Scales/Astrodynamics

Kepler orbit: F=G(m1m2/r^2)
Equations of motion
Specific orbital energy
Orbital period
Orbital_speed: v=2pi(a/T) : v^2=u/a
Escape velocity: =(2u/r)^0.5
G = Gravitational constant 6.67e-11 m^3 kg^-1 s^-2
F = Force
m, m1, m2: mass
v = velocity
u = GM = Standard gravitational parameter
r = Radius