AIDA

The near-Earth asteroid (185851) 2000 DP107 in many ways is an analog to Didymos. 2000 DP107 was the first binary asteroid ever imaged by radar. This animation is derived from planetary radar observations. In this example (2000 DP107), the primary and secondary are about 850 meters and 300 meters in diameter. They are separated by about 2.7 km. The primary rotates once every hours while the tidally locked secondary orbits the primary about once every 42 hours.