Orbit and bulk density of the OSIRIS-REx target Asteroid (101955) Bennu

  title={Orbit and bulk density of the OSIRIS-REx target Asteroid (101955) Bennu},
  author={Steven R. Chesley and Davide Farnocchia and Michael C. Nolan and David Vokrouhlicky and Paul W. Chodas and Andrea Milani and Federica Spoto and Benjamin Rozitis and Lance A. M. Benner and William F. Bottke and Michael. W. Busch and Joshua P. Emery and E. S. Howell and Dante S. Lauretta and Jean-Luc Margot and Patrick A. Taylor},
The target asteroid of the OSIRIS-REx asteroid sample return mission, (101955) Bennu (formerly 1999 RQ 36), is a half-kilometer near-Earth asteroid with an extraordinarily well constrained orbit. An extensive data set of optical astrometry from 1999 to 2013 and high-quality radar delay measurements to Bennu in 1999, 2005, and 2011 reveal the action of the Yarkovsky effect, with a mean semimajor axis drift rate da=dt ¼ð � 19:0 � 0:1 Þ� 10 
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