The global surface roughness of 25143 Itokawa

Hannah C.M. Susorney, Catherine L. Johnson, Olivier S. Barnouin, Michael G. Daly, Jeffrey A. Seabrook, Edward B. Bierhaus, Dante S. Lauretta

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Surface roughness is an important metric in understanding how the geologic history of an asteroid affects its small-scale topography and it provides an additional means to quantitatively compare one asteroid with another. In this study, we report the first detailed global surface roughness maps of 25143 Itokawa at horizontal scales from 8–32 m. Comparison of the spatial distribution of the surface roughness of Itokawa with 433 Eros, the other asteroid for which this kind of analysis has been possible, indicates that the two asteroids are dominated by different geologic processes. On Itokawa, the surface roughness reflects the results of down-slope activity that moves fine grained material into geopotential lows and leaves large blocks in geopotential highs. On 433 Eros, the surface roughness is controlled by geologically-recent large impact craters. In addition, large longitudinal spatial variations of surface roughness could impact the role of YORP on Itokawa.

Original languageEnglish (US)
Pages (from-to)141-152
Number of pages12
JournalIcarus
Volume325
DOIs
StatePublished - Jun 2019

Keywords

  • 25143 Itokawa
  • 433 Eros
  • Asteroids
  • Surface roughness
  • Topography

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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  • Cite this

    Susorney, H. C. M., Johnson, C. L., Barnouin, O. S., Daly, M. G., Seabrook, J. A., Bierhaus, E. B., & Lauretta, D. S. (2019). The global surface roughness of 25143 Itokawa. Icarus, 325, 141-152. https://doi.org/10.1016/j.icarus.2019.01.021