We used the Navy Precision Optical Interferometer to measure the limb-darkened angular diameter of the exoplanet host star \kappa CrB and obtained a value of 1.543 \pm 0.009 mas .
We calculated its physical radius ( 5.06 \pm 0.04 R _ { \odot } ) and used photometric measurements from the literature with our diameter to determine \kappa CrB ’ s effective temperature ( 4788 \pm 17 K ) and luminosity ( 12.13 \pm 0.09 L _ { \odot } ) .
We then placed the star on an H-R diagram to ascertain the star ’ s age ( 3.42 ^ { +0.32 } _ { -0.25 } Gyr ) and mass ( 1.47 \pm 0.04 M _ { \odot } ) using a metallicity of [ Fe/H ] = +0.15 .
With this mass , we calculated the system ’ s mass function with the orbital elements from a variety of sources , which produced a range of planetary masses : m _ { p } \sin i = 1.61–1.88 M _ { Jup } .
We also updated the extent of the habitable zone for the system using our new temperature .