The thermal infrared imager (TIR) onboard the Hayabusa2 spacecraft is based on an uncooled micro-bolometer array that can obtain thermal images of a target asteroid 162173 Ryugu (formerly 1999JU3). The TIR is the bolometric imager with a broadband filter in the thermal infrared range (8 to 12 um). It covers the temperature range of about 150 to 460 K and has a field of view of about 16.7 x 12.7 degrees, with 0.051 degrees per pixel (328 x 248). The primary objectives of this instrument are to investigate thermophysical properties of the surface of asteroids, such as porosity, grain size, and boulder abundance. The brightness temperature map of the asteroid is derived from TIR data for each time, and the brightness temperature map at each time and its forecast is obtained with the ground calibration data.
TIR Level1 Data
Raw count images before converting brightness temperature
Analog-to-Digital data (DN) of FITS format
Shutter "CLOSE" and "OPEN - CLOSE" images
hyb2_tir_YYYYMMDD_hhmmss_l1.fit
Brightness temperature map on the Ryugu shape model.
Polygon ID, Longitude, Latitude, Phase angle, Incidence angle, Emission angle, Pixel X, Pixel Y, Brightness temperature, Local solar time, Local solar time (normal vector) https://data.darts.isas.jaxa.jp/pub/hayabusa2/tir_bundle/data_map/
Publications
Senshu, H., et al., Development of Numerical Model of the Thermal State of an Asteroid with Locally Rough Surface and Its Application, International Journal of Thermophysics 43(7) (2022), 0.1007/s10765-022-03030-z
Sakatani, N. et al., Anomalously porous boulders on (162173) Ryugu as primordial materials from its parent body, Nature Astronomy 5, 766--774 (2021), 10.1038/s41550-021-01371-7
Arai, T. et al., Geometric correction for thermographic images of asteroid 162173 Ryugu by TIR (thermal infrared imager) onboard Hayabusa2. Earth, Planets, and Space 73, 115 (2021), 10.1186/s40623-021-01437-w
Shimaki, Y. et al., Thermophysical properties of the surface of asteroid 162173 Ryugu: Infrared observations and thermal inertia mapping, Icarus 348, 15 (2020), 10.1016/j.icarus.2020.113835
Okada, T. et al., Highly porous nature of a primitive asteroid revealed by thermal imaging, Nature 579, 518--522 (2020), 10.1038/s41586-020-2102-6
Okada, T. et al., Thermal Infrared Imaging Experiments of C-Type Asteroid 162173 Ryugu on Hayabusa2, Space Science Review 208, 255--286 (2017), 10.1007/s11214-016-0286-8
Takita, J. et al., Feasibility and Accuracy of Thermophysical Estimation of Asteroid 162173 Ryugu (1999 JU3) from the Hayabusa2 Thermal Infrared Imager. Space Science Reviews, 208, 287--315 (2017), 10.1007/s11214-017-0336-x
Arai, T. et al., Thermal Imaging Performance of TIR Onboard the Hayabusa2 Spacecraft, Space Science Review 208, 239--254 (2017), 10.1007/s11214-017-0353-9
Endo, K. et al., HEAT: Image and database browser for the thermal imager on Hayabusa2, IEEE Aerospace Conference (2017), 10.1109/AERO.2017.7943827