RX J0806.3+1527 (also known as HM Cancri or just J0806) is an X-ray binary system located about 1,600 light-years away from the constellation Cancer. It comprises two dense white dwarfs orbiting each other once every 321.5 seconds at an estimated distance of only 80,000 km apart. Data from the XMM-Newton and Swift missions show that both stellar remnants are getting closer to each other (60 cm/day), thereby expected to merge in a Type 1a supernova event in approximately 340,000 years in the future
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