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We used the Navy Precision Optical Interferometer to measure thelimb-darkened angular diameter of the exoplanet host star kappa CrB andobtained a value of 1.543 +/- 0.009 mas. We calculated its physical radius(5.06 +/- 0.04 R_Sun) and used photometric measurements from the literaturewith our diameter to determine kappa CrB's effective temperature (4788 +/- 17K) and luminosity (12.13 +/- 0.09 L_Sun). We then placed the star on an H-Rdiagram to ascertain the star's age (3.42 +0.32/-0.25 Gyr) and mass (1.47 +/-0.04 M_Sun) using a metallicity of [Fe/H] = +0.15. With this mass, wecalculated the system's mass function with the orbital elements from a varietyof sources, which produced a range of planetary masses: m_p sin i = 1.61 to1.88 M_Jup. We also updated the extent of the habitable zone for the systemusing our new temperature.

NPOI Observations of the Exoplanet Host kappa Coronae Borealis and Their Implications for the Star's and Planet's Masses and Ages