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CPD-54 810 is a double-lined detached eclipsing binary containing two mid-Ftype dwarfs on an eccentric 26-day orbit. We perform a combined analysis of theextensive photometry obtained by the TESS space mission along with previouslypublished observations to obtain a full orbital and physical solution for thesystem. We measure the following model-independent masses and radii: M1 =1.3094+/-0.0051 Msun, M2 = 1.0896+/-0.0034 Msun, R1 = 1.9288+/-0.0030 Rsun, andR2 = 1.1815+/-0.0037 Rsun. We employ a Bayesian approach to obtain thebolometric flux for both stars from observed magnitudes, colours, and fluxratios. These bolometric fluxes combined with the stars' angular diameters(from R1, R2 and the parallax from Gaia EDR3) lead directly to the stars'effective temperatures: Teff,1 = 6462+/-43 K, and Teff,2 = 6331+/-43 K, with anadditional systematic error of 0.8% (13 K) from the uncertainty in thezero-point of the flux scale. Our results are robust against the choice ofmodel spectra and other details of the analysis. CPD-54 810 is an idealbenchmark system that can be used to test stellar parameters measured by largespectroscopic surveys or derived from asteroseismology, and calibrate stellarmodels by providing robust constraints on the measured parameters. The methodspresented here can be applied to many other detached eclipsing binary systemsto build a catalogue of well-measured benchmark stars.

Fundamental effective temperature measurements for eclipsing binary stars -- II. The detached F-type eclipsing binary CPD-54 810