User:T.Randall.Scales/Astrodynamics

Ref

 * 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