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We report the discovery of a 1201 s orbital period binary, the thirdshortest-period detached binary known. SDSS J232230.20+050942.06 contains twoHe-core white dwarfs orbiting with a 27 deg inclination. Located 0.76 kpc fromthe Sun, the binary has an estimated LISA 4-yr signal-to-noise ratio of 40.J2322+0509 is the first He+He white dwarf LISA verification binary, a sourceclass that is predicted to account for one-third of resolved LISA ultra-compactbinary detections.

A 1201 s Orbital Period Detached Binary: the First Double Helium Core White Dwarf LISA Verification Binary