NIRS3: The Near Infrared Spectrometer on Hayabusa2

Takahiro Iwata, Kohei Kitazato, Masanao Abe, Makiko Ohtake, Takehiko Arai, Tomoko Arai, Naru Hirata, Takahiro Hiroi, Chikatoshi Honda, Naoya Imae, Mutsumi Komatsu, Tsuneo Matsunaga, Moe Matsuoka, Shuji Matsuura, Tomoki Nakamura, Aiko Nakato, Yusuke Nakauchi, Takahito Osawa, Hiroki Senshu, Yasuhiko TakagiKohji Tsumura, Naruhisa Takato, Sei ichiro Watanabe, Maria Antonietta Barucci, Ernesto Palomba, Masanobu Ozaki

Research output: Contribution to journalReview articlepeer-review

60 Citations (Scopus)


NIRS3: The Near Infrared Spectrometer is installed on the Hayabusa2 spacecraft to observe the target C-type asteroid 162173 Ryugu at near infrared wavelengths of 1.8 to 3.2 μm. It aims to obtain reflectance spectra in order to detect absorption bands of hydrated and hydroxide minerals in the 3 μm-band. We adopted a linear-image sensor with indium arsenide (InAs) photo diodes and a cooling system with a passive radiator to achieve an optics temperature of 188 K (− 85 C), which enables to retaining sufficient sensitivity and noise level in the 3 μm wavelength region. We conducted ground performance tests for the NIRS3 flight model (FM) to confirm its baseline specifications. The results imply that the properties such as the signal-to-noise ratio (SNR) conform to scientific requirements to determine the degree of aqueous alteration, such as CM or CI chondrite, and the stage of thermal metamorphism on the asteroid surface.

Original languageEnglish
Pages (from-to)317-337
Number of pages21
JournalSpace Science Reviews
Issue number1-4
Publication statusPublished - 2017 Jul 1


  • Asteroid
  • Hayabusa2
  • Near Infrared
  • NIRS3
  • Spectrometer


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