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V1022 Cas has been known as a spectroscopic binary for a century. It wasfound to be eclipsing based on photometry from the Hipparcos satellite, and anastrometric orbit was recently obtained from near-infrared interferometry. Wepresent the first high-precision measurement of the radii of the stars based onlight curves obtained by the TESS satellite. Combined with published radialvelocities from high-resolution spectra, we measure the masses of the stars tobe 1.626 +/- 0.001 Msun and 1.609 +/- 0.001 Msun, and the radii to be 2.591 +/-0.026 Rsun and 2.472 +/- 0.027 Rsun. The 12.16-d orbit is eccentric and thestars rotate sub-synchronously, so the system is tidally unevolved. A goodmatch to these masses and radii, and published temperatures of the stars, isfound for several sets of theoretical stellar evolutionary models, for a solarmetallicity and an age of approximately 2 Gyr. Four separate distancedeterminations to the system are available, and are in good agreement. Thedistances are based on surface brightness calibrations, theoretical bolometriccorrections, the Gaia parallax, and the angular size of the astrometric orbit.A detailed spectroscopic analysis of the system to measure chemical abundancesand more precise temperatures would be helpful.

Rediscussion of eclipsing binaries. Paper III. The interferometric, spectroscopic and eclipsing binary V1022 Cassiopeiae