A Review of Remote Sensing Observations of the Near-Earth Asteroid (25143) Itokawa

MASATERU ISHIGURO; Mingyeong Lee; Sunho Jin

Presentation information

[EE] Oral

P (Space and Planetary Sciences) » P-PS Planetary Sciences

[P-PS02] [EE] Small Bodies: Exploration of the Asteroid Belt and the Solar System at Large

Mon. May 22, 2017 9:00 AM - 10:30 AM 103 (International Conference Hall 1F)

convener:eleonora ammannito(University of California Los Angeles), Taishi Nakamoto(Tokyo Institute of Technology), Masanao Abe(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency), Christopher T Russell(University of California Los Angeles), Sei-ichiro WATANABE(Division of Earth and Planetary Sciences, Graduate School of Science, Nagoya University), Chairperson:Hikaru Yabuta(Hiroshima University)

9:30 AM - 9:45 AM

[PPS02-21] A Review of Remote Sensing Observations of the Near-Earth Asteroid (25143) Itokawa

★Invited papers

*MASATERU ISHIGURO¹, Mingyeong Lee¹, Sunho Jin¹ (1.Department of Physics and Astronomy, Seoul National University)

Keywords:Hayabusa, Asteroid, Itokawa

The Hayabusa spacecraft carried out detailed scientific observations of its mission target asteroid, (25143) Itokawa, using the onboard devices: a telescopic imaging camera (AMICA, at 0.38 - 1.01 um with seven narrowband filters), a near-infrared spectrometer (NIRS, 0.8 - 2.1 um), an x-ray fluorescence spectrometer (XRS), and a laser altimeter (LIDAR), revealing its shape, mass, and surface topography and mineralogical properties. From the low bulk density (1.9±0.1 g/cm³), high porosity (40 %), boulder-rich appearance, and irregular shape, it is considered that Itokawa has a rubble-pile structure. We learned that Itokawa has a large variety of albedo, color, and spectral shape, which can be explained by space weathering on the S-type asteroid. At the conference, we review these findings by the remote-sensing devices. In addition, we introduce our resent research activity at Seoul National University using AMICA data archive, which includes an updated data reduction process, studies of back-scattering properties and spatial variation of the optical spectra using all AMICA filters.