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

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

★招待講演

*石黒 正晃¹、Lee Mingyeong¹、Jin Sunho¹ (1.ソウル大学物理天文学科)

キーワード：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 mm with seven narrowband filters), a near-infrared spectrometer (NIRS, 0.8 - 2.1 mm), 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.