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We present the gravitational microlensing discovery of a 4 M_Uranus planetthat orbits a 0.7 M_Sun star at ~18 AU. This is the first known analog ofUranus. Similar planets, i.e., cold ice-giants, are inaccessible to eitherradial velocity or transit methods because of the long orbital periods, whilelow reflected light prevents direct imaging. We discuss how similar planets maycontaminate the sample of the very short microlensing events that areinterpreted as free-floating planets with an estimated rate of 1.8 per mainsequence star. Moreover, the host star has a nearby stellar (or brown dwarf)companion. The projected separation of the planet is only ~3 times smaller thanthat of the companion star, suggesting significant dynamical interactions.

Triple Microlens OGLE-2008-BLG-092L: Binary Stellar System with a Circumprimary Uranus-type Planet