If we are referring to the centre of mass of the two-body system as origin, then \(h\) and \(l\) are the angular momentum per unit mass of the orbiting body and the semi latus rectum relative to the c...If we are referring to the centre of mass of the two-body system as origin, then \(h\) and \(l\) are the angular momentum per unit mass of the orbiting body and the semi latus rectum relative to the centre of mass of the system, and \(M\) is the mass function \(M^3 /(M + m)^2\) of the system, \(M\) and \(m\) being the masses of Sun and planet respectively.
