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We present the discovery of the eclipsing double white dwarf (WD) binary WDJ022558.21-692025.38 that has an orbital period of 47.19 min. Followingidentification with the Transiting Exoplanet Survey Satellite, we obtainedtime-series ground based spectroscopy and high-speed multi-band ULTRACAMphotometry which indicate a primary DA WD of mass 0.40 +- 0.04 Msol and a 0.28+- 0.02 Msol mass secondary WD, which is likely of type DA as well. The systembecomes the third-closest eclipsing double WD binary discovered with a distanceof approximately 400 pc and will be a detectable source for upcominggravitational wave detectors in the mHz frequency range. Its orbital decay willbe measurable photometrically within 10 yrs to a precision of better than 1%.The fate of the binary is to merge in approximately 41 Myr, likely forming asingle, more massive WD.

An Eclipsing 47 minute Double White Dwarf Binary at 400 pc