he Doppler technique has the main advantage of being able to detect planets in a wide range of orbits - as long as the orbit is not face-on. It is most sensitive to large planets close to their stars. Its disadvantage is that it can yield only the planet's mass and orbital properties.
The transit method has the advantage of yielding completely different information: a planet's size. This method is even more biased to large planets close to their stars. Its disadvantage is that few planets have the necessary orbital alignment to even be detectable.
If a planet can be detected by both methods, then we can find its density - an indication of its composition.

The fundamental benefit of the Doppler method is it can find planets in a variety of orbits as long as they are not face-on. Its drawback is that it will only provide information on the planet's size and orbit.

The asteroid is never seen using the Doppler method . Instead, the presence of an undetected planet is implied by a model of the host star's time-varying velocity. Planets orbits near to their stars are what it is most susceptible to.By observing variations in Doppler shifts caused by an exoplanet's gravitational influence on its home star, astronomers may identify the planet. The star's light spectrum shows these shifts as variations in red or blue hue. Doppler spectroscopy is an indirect approach for discovering extrasolar planets & brown dwarfs using radial-velocity data by looking for Doppler changes in the spectra of the earth's natural parent star. It is sometimes referred to as the radial-velocity technique or, more often, the wobble method.

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