Asteroid 21 Lutetia: Low Mass, High Density

@article{Ptzold2011Asteroid2L,
  title={Asteroid 21 Lutetia: Low Mass, High Density},
  author={M. P{\"a}tzold and T. Andert and S. Asmar and J. Anderson and J. Barriot and M. Bird and B. H{\"a}usler and M. Hahn and S. Tellmann and H. Sierks and P. Lamy and B. Weiss},
  journal={Science},
  year={2011},
  volume={334},
  pages={491 - 492}
}
A spacecraft flyby of an asteroid reveals a high-density body that is more like a planetesimal than a rubble pile. Asteroid 21 Lutetia was approached by the Rosetta spacecraft on 10 July 2010. The additional Doppler shift of the spacecraft radio signals imposed by 21 Lutetia’s gravitational perturbation on the flyby trajectory were used to determine the mass of the asteroid. Calibrating and correcting for all Doppler contributions not associated with Lutetia, a least-squares fit to the residual… Expand
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