<P> In 2010, six binary stars were astrometrically measured . One of the star systems, called HD 176051, was found with "high confidence" to have a planet . </P> <P> In 2018, a study comparing observations from the Gaia spacecraft to Hipparcos data for the Beta Pictoris system was able to measure the mass of Beta Pictoris b, constraining it to 7001110000000000000 ♠ 11 ± 2 Jupiter masses . This is in good agreement with previous mass estimations of roughly 13 Jupiter masses . </P> <P> An optical / infrared interferometer array doesn't collect as much light as a single telescope of equivalent size, but has the resolution of a single telescope the size of the array . For bright stars, this resolving power could be used to image a star's surface during a transit event and see the shadow of the planet transiting . This could provide a direct measurement of the planet's angular radius and, via parallax, its actual radius . This is more accurate than radius estimates based on transit photometry, which are dependent on stellar radius estimates which depend on models of star characteristics . Imaging also provides more accurate determination of the inclination than photometry does . </P> <P> Radio emissions from magnetospheres could be detected with future radio telescopes . This could enable determination of the rotation rate of a planet, which is difficult to detect otherwise . </P>

Which method of detecting exoplanets would be most useful in determining the planets radius
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