Radar observations of asteroid 216 kleopatra

@article{Ostr2000RadarOO,
  title={Radar observations of asteroid 216 kleopatra},
  author={Ostr{\'o} and Hudson and Nolan and Margot and Scheeres and Campbell and Magri and Giorgini and Yeomans},
  journal={Science},
  year={2000},
  volume={288 5467},
  pages={
          836-9
        }
}
Radar observations of the main-belt, M-class asteroid 216 Kleopatra reveal a dumbbell-shaped object with overall dimensions of 217 kilometers by 94 kilometers by 81 kilometers (+/-25%). The asteroid's surface properties are consistent with a regolith having a metallic composition and a porosity comparable to that of lunar soil. Kleopatra's shape is probably the outcome of an exotic sequence of collisional events, and much of its interior may have an unconsolidated rubble-pile structure. 

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