[U-06_28AM1] New Progress toward the Understanding of Small Solar System Bodies

9:45 AM - 10:00 AM JST(12:45 AM - 1:00 AM UTC)

[U06-04] A strategy to estimate thermal properties using Thermal Infrared Imager on board Hayabusa-2.

*Hiroki SENSHU¹, Jun TAKITA², Satoshi TANAKA³, Tatsuaki OKADA³ (1.PERC/Chitech, 2.Graduate School of Science, Tokyo University, 3.ISAS/JAXA)

Keywords:

hayabusa-2,thermal infrared imager,surface temperature,thermal properties,thernal inertia,emissivity

Thermal InfraRed imager (TIR) on board Hayabusa-2, an upcoming japanese mission to C-type asteroid 1999JU3, is non-cooled bolometer which image mid-infrared thermal emission from the asteroidal surface. The field-of-view (FOV) of TIR is 16x12 degrees and ts effective pixels are 320x240. So the spacial resolution, which depends on distance from the suface, is about 18m from an altitude of 20km (Home position) and less than 1m from an altitude of 1km. By comparing the temperature distribution obtained by TIR and thermal evolution model, we can get thermophysical properties such as thermal inertia and emissivity. These parameters are diagnostic for the characteristic size of surafce grain. In this presentation we will present our strategy to estimate the thermophysical properties from TIR observation.