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V1765 Cyg is a detached eclipsing binary containing a B0.5 supergiant and aB1 main-sequence star, with an orbital period of 13.37 d and an eccentricity of0.315. The system shows apsidal motion and the supergiant exhibits strongstochastic variability. V1765 Cyg was observed by the Transiting ExoplanetSurvey Satellite over four sectors. We analyse these data to obtain the firstdeterminate light curve model for the system. To this we add publishedspectroscopic orbits to infer masses of 23 +/- 2 Msun and 11.9 +/- 0.7 Msun,and radii of 20.6 +/- 0.8 Rsun and 6.2 +/- 0.3 Rsun. These properties are ingood agreement with theoretical predictions for a solar chemical compositionand an age around 7 Myr. We also present two epochs of blue-opticalspectroscopy that confirm the luminosity classification of the primary star andappear to show absorption lines from the secondary star. Extensive spectroscopyand further analysis of the system is recommended.

Rediscussion of eclipsing binaries. Paper XV. The B-type supergiant system V1765 Cygni