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We report the discovery of the sixth known eclipsing double white dwarf (WD)system, SDSS J1152+0248, with a 2.3968 +/- 0.0003 h orbital period, in datafrom the Kepler Mission's K2 continuation. Analysing and modelling the K2 datatogether with ground-based fast photometry, spectroscopy, and radial-velocitymeasurements, we determine that the primary is a DA-type WD with mass M1 = 0.47+/- 0.11 Msun, radius R1 = 0.0197 +/- 0.0035 Rsun, and cooling age t1 = 52 +/-36 Myr. No lines are detected, to within our sensitivity, from the secondaryWD, but it is likely also of type DA. Its central surface brightness, asmeasured from the secondary eclipse, is 0.31 of the primary's surfacebrightness. Its mass, radius, and cooling age, respectively, are M2 = 0.44 +/-0.09 Msun, R2 = 0.0223 +0.0064 -0.0050 Rsun, and t2 = 230 +/- 100 Myr. SDSSJ1152+0248 is a near twin of the double-lined eclipsing WD system CSS 41177.

SDSS J1152+0248: An eclipsing double white dwarf from the Kepler K2 campaign