Dust Detection Mode of the Hayabusa2 LIDAR

  • H. Senshu
  • S. Oshigami
  • M. Kobayashi
  • R. Yamada
  • N. Namiki
  • H. Noda
  • Y. Ishihara
  • T. Mizuno
Article

DOI: 10.1007/s11214-016-0242-7

Cite this article as:
Senshu, H., Oshigami, S., Kobayashi, M. et al. Space Sci Rev (2016). doi:10.1007/s11214-016-0242-7

Abstract

We aim to use light detection and ranging (LIDAR) to detect dust grains that might be present around asteroid (162173) Ryugu (1999 JU3), the target of the Hayabusa2 mission. LIDAR is currently used for observing atmospheric aerosols on Earth by measuring the time profile of the return pulse (received light). In the case of Hayabusa2, LIDAR will be used only to determine whether the energy flux of the return pulse exceeds a certain threshold every 133.33 ns. This simplification significantly reduces the amount of down link data. The profile of the return pulse is estimated from iterative observations by changing the thresholds. Here, the performance of the dust counter mode is examined using a breadboard model, a flight model, and an engineering model. For these tests, we develop a new testing device to simulate various time profiles of the return pulse. We also estimate the lower bound of the number density of dust grains that can be detected. It is shown that the LIDAR on board Hayabusa2 is capable of detecting asteroidal dust if dust grains with size similar to the Hayabusa sample exist around the target body and their number density exceeds \(10^{5}~\mbox{m}^{-3}\).

Keywords

Hayabusa2 LIDAR Dust Asteroid Ryugu 

Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  • H. Senshu
    • 1
  • S. Oshigami
    • 2
  • M. Kobayashi
    • 1
  • R. Yamada
    • 2
  • N. Namiki
    • 2
  • H. Noda
    • 2
  • Y. Ishihara
    • 3
  • T. Mizuno
    • 3
  1. 1.Chiba Institute of TechnologyPlanetary Exploration Research CenterNarashinoJapan
  2. 2.RISE ProjectNational Astronomical Observatory of JapanTokyoJapan
  3. 3.Institute of Space and Astronomical ScienceJapan Aerospace Exploration AgencySagamiharaJapan

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