Particle Size-Frequency Distributions of the OSIRIS-REx Candidate Sample Sites on Asteroid (101955) Bennu - Archive ouverte HAL Access content directly
Journal Articles Remote Sensing Year : 2021

Particle Size-Frequency Distributions of the OSIRIS-REx Candidate Sample Sites on Asteroid (101955) Bennu

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Keara N Burke
Daniella N Dellagiustina
Carina A Bennett
Kevin J Walsh
Maurizio Pajola
  • Function : Author
  • PersonId : 1046343
Edward B Bierhaus
Michael C Nolan
  • Function : Author
  • PersonId : 1113803
William V Boynton
  • Function : Author
Juliette I Brodbeck
Harold C Connolly
Jason P Dworkin
Catherine M Elder
Dathon R Golish
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Rachael H Hoover
  • Function : Author
  • PersonId : 1138160
Erica R Jawin
Timothy J Mccoy
Patrick Michel
Jamie L Molaro
Jennifer O Nolau
Jacob Padilla
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  • PersonId : 1113804
Bashar Rizk
Stuart J Robbins
Eric M Sahr
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  • PersonId : 1113805
Peter H Smith
  • Function : Author
Stephanie J Stewart
  • Function : Author
  • PersonId : 1113806
Hannah C M Susorney
  • Function : Author
  • PersonId : 1113807
Heather L Enos
  • Function : Author
  • PersonId : 1113808
Dante S Lauretta

Abstract

We manually mapped particles ranging in longest axis from 0.3 cm to 95 m on (101955) Bennu for the Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) asteroid sample return mission. This enabled the mission to identify candidate sample collection sites and shed light on the processes that have shaped the surface of this rubble-pile asteroid. Building on a global survey of particles, we used higher-resolution data from regional observations to calculate particle size-frequency distributions (PSFDs) and assess the viability of four candidate sites for sample collection (presence of unobstructed particles ≤ 2 cm). The four candidate sites have common characteristics: each is situated within a crater with a relative abundance of sampleable material. Their PSFDs, however, indicate that each site has experienced different geologic processing. The PSFD power-law slopes range from −3.0 ± 0.2 to −2.3 ± 0.1 across the four sites, based on images with a 0.01-m pixel scale. These values are consistent with, or shallower than, the global survey measurements. At one site, Osprey, the particle packing density appears to reach geometric saturation. We evaluate the uncertainty in these measurements and discuss their implications for other remotely sensed and mapped particles, and their importance to OSIRIS-REx sampling operations.
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Dates and versions

insu-03381690 , version 1 (17-10-2021)

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Keara N Burke, Daniella N Dellagiustina, Carina A Bennett, Kevin J Walsh, Maurizio Pajola, et al.. Particle Size-Frequency Distributions of the OSIRIS-REx Candidate Sample Sites on Asteroid (101955) Bennu. Remote Sensing, 2021, 13 (7), pp.1315. ⟨10.3390/rs13071315⟩. ⟨insu-03381690⟩
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