NIRS3: The Near Infrared Spectrometer on Hayabusa2

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

来源：Space Science Reviews, 2017, 208(1-4): 317-337.

DOI：10.1007/s11214-017-0341-0

• Hayabusa2
• NIRS3
• Asteroid
• Near Infrared
• Spectrometer

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 mu m. It aims to obtain reflectance spectra in order to detect absorption bands of hydrated and hydroxide minerals in the 3 mu m-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 degrees C), which enables to retaining sufficient sensitivity and noise level in the 3 mu m 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.

• 出版日期2017-7
• 单位中国科学院国家天文台; 中国极地研究中心