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Near InfraRed Spectrometer (NIRS3)

NSSDCA ID: 2014-076A-02

Mission Name: Hayabusa2


The Hayabusa2 Near InfraRed Spectrometer (NIRS3) is designed to make reflectance spectra measurements at wavelengths from 1.8 to 3.2 microns. It is particularly sensitive to molecular absorption bands of hydroxide and hydrated minerals at 2.7 to 3.0 microns. NIRS3 is a linear-image sensor with indium arsenide (InAs) photodiodes and a passive cooling system to maintain an optics temperature of 198 K. The instrument has a mass of 4.46 kg, a nominal power of 9.9 W, and a peak requirement of 14.9 W.

It has a field-of-view of 0.11 degrees and a spectral sampling resolution of 18 nm/pixel. The spatial resolution is 40 m at 20 km altitude, and 2 at 1 km. Light enters the NIRS3 aperture, is collimated, dispersed, and detected by the linear-image sensor. The amplified analog signal is converted to digital data and transmitted to Earth.

Alternate Names

  • Hayabusa2/NearInfraRedSpectrometer(NIRS3)
  • urn:jaxa:darts:context:instrument:hyb2.nirs3

Facts in Brief

Mass: 4.46 kg
Power (avg): 9.9 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

  • Iwata, T., et al., NIRS3: The Near Infrared Spectrometer on Hayabusa2, Space Sci. Rev., 208, No. 1-4, 317-337, doi:10.1007/s11214-017-0341-0, Jul. 2017.
  • Watanabe, S., et al., Hayabusa2 arrives at the carbonaceous asteroid 162173 Ryugu—A spinning top-shaped rubble pile, Science, 364, No. 6437, doi:10.1126/science.aav8032, Apr. 2019.
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