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<-   Brightness variations   ->
figures/profondeurtransit.gif
Brightness variation of a planet due to a transit.
Crédit : Paris Observatory - UFE

The "depth" of the transit depends on the size of the star and the planet. The larger the star is, the less deep the transit is, the larger the planet is, the deeper the transit is.

In the case of the Earth in front of the Sun, the depth of the transit is 80 thousandths, in the case of Jupiter it is one hundredth.

The transit is periodic, and the period is that of the rotation of the planet around the star. The length of the transit depends on the period of the planet, i.e. on its distance from the star.