The Rubble-Pile Asteroid Itokawa as Observed by Hayabusa

@article{Fujiwara2006TheRA,
  title={The Rubble-Pile Asteroid Itokawa as Observed by Hayabusa},
  author={Akira Fujiwara and Junichiro Kawaguchi and Donald Keith Yeomans and Masanao Abe and Toshiharu Mukai and Takashi Okada and Jun Saito and Hajime Yano and Makoto Yoshikawa and Daniel J. Scheeres and Olivier S. Barnouin-Jha and Andrew Cheng and Hirohide Demura and R. W. Gaskell and Naru Hirata and H. Ikeda and Takashi Kominato and Hideaki Miyamoto and Akiko M. Nakamura and Rumi Nakamura and Sho Sasaki and Kuninori T. Uesugi},
  journal={Science},
  year={2006},
  volume={312},
  pages={1330 - 1334}
}
During the interval from September through early December 2005, the Hayabusa spacecraft was in close proximity to near-Earth asteroid 25143 Itokawa, and a variety of data were taken on its shape, mass, and surface topography as well as its mineralogic and elemental abundances. The asteroid's orthogonal axes are 535, 294, and 209 meters, the mass is 3.51 × 1010 kilograms, and the estimated bulk density is 1.9 ± 0.13 grams per cubic centimeter. The correspondence between the smooth areas on the… 
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References

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TLDR
Combined with surface observations, these data indicate that Itokawa is the first subkilometer-sized small asteroid showing a rubble-pile body rather than a solid monolithic asteroid.
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TLDR
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