Keywords:
Follow-up observations for AKARI/IRC near-infrared asteroid
spectroscopic survey (AcuA-spec) 
*Sunao Hasegawa1, Daisuke KURODA2, Kenshi YANAGISAWA3, Fumihiko Usui4
1. Japan Aerospace Exploration Agency, 2. Kyoto University, 3. National Astronomical Observatory of Japan, 4. Kobe
University 
In the range from 1 to 2.5 μm, we made the spectroscopic observations of the AcuA-spec asteroids
(Hasegawa et al. 2017, PASJ, 69, 9), whose spectra were obtained in continuous covered between 2.5 and
5.0 μm by NIR/IRC/AKARI (Usui et al. 2019, PASJ, 71, 1). Candidates of AcuA-spec asteroids were
selected from only main-belt asteroids classified based on visible spectrophotometric and spectroscopic
observations (Tholen 1984, PhD thesis, Arizona University; Bus & Binzel 2002, Icarus, 158, 146; Lazzaro
et al. 2004, Icarus, 172, 179). About 200 classified asteroids were raised as observational candidates.
Spectroscopic observations for 65 AcuA-spec asteroids which were selected among the AcuA-spec
candidate catalogue in taking account of signal-noise ratio and target opportunity by AKARI were
executed. 
Section work of the AcuA-spec candidate catalogue was done around 2005, yet there were not many
spectroscopic observations of asteroids in the near-infrared wavelength range. As a result of survey of
published paper for near-infrared spectroscopic observations of asteroids, howevwer, it was found that
spectroscopic observations in the near-infrared region of 1–2.5 μm for most AcuA-spec asteroids are
performed except for several asteroids. 
If data in near-infrared wavelength range of the lacked AcuA-spec asteroids were acquired, all AcuA-spec
asteroids will have 0.35–5 μm of data available. Obtaining continuous reflectance of asteroids is essential
data to compare with those such as meteorites. Based on the Bus-DeMeo taxonomy (DeMeo et al. 2009,
Icarus, 202, 160), we conducted classification of all AcuA-spec asteroids using published and our
observational data. 
asteroids, spectroscopy 
PPS03-P18Japan Geoscience Union Meeting 2019
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