65803 Didymos (1996 GT) is an Apollo asteroid discovered on April 11 1996 by Spacewatch at Kitt Peak. It has a satellite orbiting it with a period of 11.9 hours hence the appellation Didymos meaning twin. The primary asteroid is about 800 m in diameter the satellite is about 150 m in diameter in an orbit about 1.1 km from the primary. The rotation rate of Didymos is fast 2.26 hours. Its density is 1.7±0.4 g/cm3.
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