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Space Science Reviews

, Volume 208, Issue 1–4, pp 317–337 | Cite as

NIRS3: The Near Infrared Spectrometer on Hayabusa2

  • Takahiro IwataEmail author
  • 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 Takagi
  • Kohji Tsumura
  • Naruhisa Takato
  • Sei-ichiro Watanabe
  • Maria Antonietta Barucci
  • Ernesto Palomba
  • Masanobu Ozaki
Article

Abstract

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 (\(-85^{\circ}\mbox{C}\)), 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.

Keywords

Hayabusa2 NIRS3 Asteroid Near Infrared Spectrometer 

Notes

Acknowledgements

The authors are grateful to members of Meisei Electric Co., Ltd., particularly to Dr. Hajime Murao, Ms. Yuko Minagawa-Sakata, and Mr. Koji Taguchi for the design and development of the NIRS3 system and for supporting the ground-performance tests; to Dr. Norihide Takeyama (Genesia Corporation) for designing and adjusting the optical assembly; and to Mr. Sumura (Hamamatsu Photonics K.K.) for developing the InAs linear-image sensor. The authors are also thankful to Prof. Toshifumi Mukai, Prof. Hiroshi Murakami, Dr. Munetaka Ueno, and Mr. Hiroyuki Minamino (Japan Aerospace Exploration Agency) who provided many useful comments and advice especially for reducing noise and improving the optical performance of the NIRS3 system.

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Copyright information

© Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  • Takahiro Iwata
    • 1
    • 2
    Email author
  • Kohei Kitazato
    • 3
  • Masanao Abe
    • 1
    • 2
  • Makiko Ohtake
    • 1
    • 2
  • Takehiko Arai
    • 4
  • Tomoko Arai
    • 5
  • Naru Hirata
    • 3
  • Takahiro Hiroi
    • 6
  • Chikatoshi Honda
    • 3
  • Naoya Imae
    • 7
  • Mutsumi Komatsu
    • 8
  • Tsuneo Matsunaga
    • 4
  • Moe Matsuoka
    • 9
  • Shuji Matsuura
    • 10
  • Tomoki Nakamura
    • 9
  • Aiko Nakato
    • 11
  • Yusuke Nakauchi
    • 1
    • 2
  • Takahito Osawa
    • 12
  • Hiroki Senshu
    • 5
  • Yasuhiko Takagi
    • 13
  • Kohji Tsumura
    • 9
  • Naruhisa Takato
    • 14
  • Sei-ichiro Watanabe
    • 15
  • Maria Antonietta Barucci
    • 16
  • Ernesto Palomba
    • 17
  • Masanobu Ozaki
    • 1
    • 2
  1. 1.Institute of Space and Astronautical ScienceJapan Aerospace Exploration AgencySagamiharaJapan
  2. 2.Sagamihara CampusSOKENDAISagamiharaJapan
  3. 3.The University of AizuAizuwakamatsuJapan
  4. 4.National Institute for Environmental StudiesTsukubaJapan
  5. 5.Chiba Institute of TechnologyNarashinoJapan
  6. 6.Brown UniversityProvidenceUSA
  7. 7.National Institute of Polar ResearchTachikawaJapan
  8. 8.SOKENDAIHayama-machiJapan
  9. 9.Tohoku UniversitySendaiJapan
  10. 10.Kwansei Gakuin UniversitySandaJapan
  11. 11.Kyoto UniversityKyotoJapan
  12. 12.Japan Atomic Energy AgencyTokai-muraJapan
  13. 13.Aichi Toho UniversityNagoyaJapan
  14. 14.Subaru TelescopeNational Astronomical Observatory of JapanHiloUSA
  15. 15.Nagoya UniversityNagoyaJapan
  16. 16.LESIA, Observatorie de ParisCentre National d’Études SpatialesMeudonFrance
  17. 17.INAFInstituto di Astrofisica e Planetologia SpazialiRomeItaly

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