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We present high-resolution Large Binocular Telescope LBTI/LMIRcam images ofthe spectroscopic and astrometric binary NO UMa obtained as part of the LBTIExozodi Exoplanet Common Hunt (LEECH) exoplanet imaging survey. Our H, K$_s$,and L'-band observations resolve the system at angular separations <0.09". Thecomponents exhibit significant orbital motion over a span of ~7 months. Wecombine our imaging data with archival images, published speckle interferometrymeasurements, and existing spectroscopic velocity data to solve the fullorbital solution and estimate component masses. The masses of the K2.0$\pm$0.5primary and K6.5$\pm$0.5 secondary are 0.83$\pm$0.02 M$_{\odot}$ and0.64$\pm$0.02 M$_{\odot}$, respectively. We also derive a system distance of d= 25.87$\pm$0.02 pc and revise the Galactic kinematics of NO UMa. Our revisedGalactic kinematics confirm NO UMa as a nuclear member of the ~500 Myr old UrsaMajor moving group and it is thus a mass and age benchmark. We compare themasses of the NO UMa binary components to those predicted by five sets ofstellar evolution models at the age of the Ursa Major group. We find excellentagreement between our measured masses and model predictions with littlesystematic scatter between the models. NO UMa joins the short list of nearby,bright, late-type binaries having known ages and fully characterized orbits.

The LEECH Exoplanet Imaging Survey: Orbit and Component Masses of the Intermediate Age, Late-Type Binary NO UMa