  CPD-54 810 is a double-lined detached eclipsing binary containing two mid-F
type dwarfs on an eccentric 26-day orbit. We perform a combined analysis of the
extensive photometry obtained by the TESS space mission along with previously
published observations to obtain a full orbital and physical solution for the
system. 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, and
R2 = 1.1815+/-0.0037 Rsun. We employ a Bayesian approach to obtain the
bolometric flux for both stars from observed magnitudes, colours, and flux
ratios. 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 an
additional systematic error of 0.8% (13 K) from the uncertainty in the
zero-point of the flux scale. Our results are robust against the choice of
model spectra and other details of the analysis. CPD-54 810 is an ideal
benchmark system that can be used to test stellar parameters measured by large
spectroscopic surveys or derived from asteroseismology, and calibrate stellar
models by providing robust constraints on the measured parameters. The methods
presented here can be applied to many other detached eclipsing binary systems
to build a catalogue of well-measured benchmark stars.
