Unlike standard orbits which are classified by their orbital eccentricity, radial orbits are classified by their specific orbital energy, the constant sum the kinetic and the potential energies.
Radial orbits are classified by their specific orbital energy. This was unlike standard orbits. Radial orbits are classified by the constant sum the kinetic. This was unlike standard orbits. Radial orbits are classified by the potential energies. This was unlike standard orbits. These standard orbits are classified by their orbital eccentricity.