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| caption = [[Arecibo Observatory]] radar images of {{mp|2009 FD}} ...th highest [[Impact event|impact threat]]{{efn|name=palermo}} of all known asteroids based on its estimated diameter, kinetic yield, impact probability, and tim ...

...got, C. Magri, A. Grauer, and S. Larson. The discovery used lightcurve and radar observations from the [[Jet Propulsion Laboratory]], Pasadena, [[California [[File:Didymos-Arecibo-radar-images.png|thumb|left|Radar images of Didymos and Dimorphos taken by the [[Arecibo Observatory]] in 200 ...