An orbit with eccentricity e = 1 is parabolic. From the ellipse equation, it is clear that as
remains finite. Parabolic orbits are therefore characterized by a quantity q defined by
where h is the specific angular momentum, G is the gravitational constant, M is the mass of the
central body, and mu is defined by
Circular Orbit, Elliptical Orbit, Hyperbolic Orbit, Orbit, Parabolic Orbit, Two-Body Problem