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Thermal InfraRed Imager (TIR)

NSSDCA ID: 2014-076A-01

Mission Name: Hayabusa2


The Hayabusa2 Thermal InfraRed (TIR) instrument is a two-dimensional thermal infrared imager, with basically the same design as the LIR instrument on the Akatsuki Venus Climate Orbiter. TIR is based on a 328 x 248 pixel uncooled micro-bolimeter array covering the mid-infrared range from 8 - 12 microns. The microbolimeter array is composed of vanadium-oxide, the instrument utilizes a F/1.4 germanium lens, a baffle to screen out stray radiation, a shutter, and a stepper motor. It has a total mass of 3.28 kg and nominally uses 18 W power.

TIR covers the temperature range of 150 K to 460 K. The field-of-view is 16.7 x 12.7 degrees, with an IFOV of 0.051 degrees/pixel. This is equivalent to approximately 17 m/pixel resolution from 20 km altitude (the home position), 85 cm/pixel from 1 km altitude, and roughly 1 cm/pixel from 10 meters. TIR is designed to take approach images, do global mapping from 20 km and 5 km altitude, take close-up images at approximately 1 km, and take images from 10 - 40 meter altitude during the touchdown rehearsals and sample collection. It will also image the MASCOT lander and the Small Carry-On Impactor operations.

Alternate Names

  • Hayabusa2/ThermalInfraRedImager(TIR)
  • urn:jaxa:darts:context:instrument:hyb2.tir

Facts in Brief

Mass: 3.28 kg
Power (avg): 18 W

Funding Agency

  • Japan Aerospace Exploration Agency (Japan)


  • Planetary Science: Small Bodies

Additional Information

Questions and comments about this experiment can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail

Selected References

  • Arai, T., et al., Thermal Imaging Performance of TIR Onboard the Hayabusa2 Spacecraft, Space Sci. Rev., 208, No. 1-4, 239-254, doi:0.1007/s11214-017-0353-9, Jul. 2017.
  • Okada, T., et al., Thermal Infrared Imaging Experiments of C-Type Asteroid 162173 Ryugu on Hayabusa2, Space Sci. Rev., 208, No. 1-4, 255-286, doi:10.1007/s11214-016-0286-8, Jul. 2017.
  • Takita, J., et al., Feasibility and Accuracy of Thermophysical Estimation of Asteroid 162173 Ryugu (1999 JU3) from the Hayabusa2 Thermal Infrared Imager, Space Sci. Rev., 208, No. 1-4, 287-315, doi:10.1007/s11214-017-0336-x, Jul. 2017.
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