What are the strengths and limitations of the Doppler method? The Doppler method is able to detect planets in a wide range of orbits--as long as the orbit is not face-on. Its disadvantage is that it can yield only the orbital period and estimation of planet's mass. The Doppler method could be used with relatively small telescopes, because it does not require large light-collecting area or good angular resolution. Its disadvantage is that it can yield only the orbital period and estimation of planet's mass. The Doppler method is able to detect planets in a wide range of orbits--as long as the orbit is not face-on. Its disadvantage is that it can yield only the planet's sizes and orbital inclination. The Doppler method could be used with relatively small telescopes, because it does not require large light-collecting area or good angular resolution. Its disadvantage is that it can yield only the planet's sizes and orbital inclination