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We have measured the angular diameter of the transiting extrasolar planethost star HD 189733 using the CHARA O/IR interferometric array. Combining ournew angular diameter of 0.377+/-0.024 mas with the Hipparcos parallax leads toa linear radius for the host star of 0.779+/-0.052 Rsol and a radius for theplanet of 1.19+/-0.08 RJup. Adopting the mass of the planet as derived by itsdiscoverers, we derive a mean density of the planet of 0.91+/-0.18 g cm-3. Thisis the first determination of the diameter of an extrasolar planet throughpurely direct means.

Direct Measurement of the Radius and Density of the Transiting Exoplanet HD 189733B with the CHARA Array