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1 results

  • Thermophysical Characteristics of OSIRIS-REx Target Asteroid (101955) Bennu

  • Liangliang Yu, Jianghui Ji
  • Journal:
    Proceedings of the International Astronomical Union / Volume 10 / Issue S318 / August 2015
    Published online by Cambridge University Press:
    01 March 2016, pp. 218-220
    Print publication:
    August 2015
    • Article
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  • In this work, we investigate the thermophysical properties, including thermal inertia, roughness fraction and surface grain size of OSIRIS-REx target asteroid (101955) Bennu by using a thermophysical model with the recently updated 3D radar-derived shape model (Nolan et al., 2013) and mid-infrared observations (Müller et al. 2012, Emery et al., 2014). We find that the asteroid bears an effective diameter of 510+6−40 m, a geometric albedo of 0.047+0.0083−0.0011, a roughness fraction of 0.04+0.26−0.04, and thermal inertia of 240+440−60 Jm−2s−0.5K−1 for our best-fit solution. The best-estimate thermal inertia suggests that fine-grained regolith may cover a large portion of Bennu's surface, where a grain size may vary from 1.3 to 31 mm. Our outcome suggests that Bennu is suitable for the OSIRIS-REx mission to return samples to Earth.