Here's some actual data on COROT-7-b one of 3 planets around the star found by COROT. Notice the many significant figures of accuracy in the orbital period and transit times, used to calculate the planet's radius. Using these same figures the basic data on the KOV star itself could be improved, yielding a more accurate diameter for the primary star itself than the less than 2 significant figures currently available. So COROT and Kepler can also increase our actual real world data on stars as well as planets. Most stellar diameters are projections based on the spectral type and not measured as is Betelguese.