Spectral Type and Geometric Albedo of (98943) 2001 CC21, the Hayabusa2# Mission Target

Le résumé fourni par la source

We conducted optical polarimetry and near-infrared spectroscopy of JAXA's Hayabusa2# mission target, (98943) 2001 CC21, in early 2023. Our new observations indicate that this asteroid has a polarimetric inversion angle of ~20\(^\circ\), absorption bands around 0.9 and 1.9 \(\mu\)m, and a geometric albedo of 0.23\(\pm\)0.04. All these features are consistent with those of S-types but inconsistent with L-types. Based on this evidence, we conclude that JAXA's Hayabusa2# spacecraft will explore an S-type asteroid (more specifically, an L or LL chondrite-like object) with albedo and size (0.44-0.53 km when we assume the absolute magnitude of 18.8) similar to (25143) Itokawa. —————————————————————————— Description —————————————————————————— This ‘data’ directory contains the polarimetric and spectroscopic data of 2001 CC21 used to derive the results in Geem et al. MNRAS Letter 2023 (https://doi.org/10.48550/arXiv.2304.02917). See the published papers by Geem et al. (MNRAS Letter 2023) If you need any questions, please contact Jooyeon Geem via her mail (ksky0422@snu.ac.kr). —————————————————————————— Directory tree structure —————————————————————————— /data ├──/polarimetry │ └──/Instrument (FAPOL, HONIR and, MSI) │ └──/Observation Date │ └──/Filter (V or R) │ ├── *.fits (Preprocessed image in FITS format) │ ├── mask_*.fits (Masking image in FITS format) │ └── *.mag.1 (IRAF Phot file containing target's center info.) │ └──/spectroscopy └──/Observation Date (230206 and 230205) ├── obslog.txt (Observation log file) └── *.fits (The extracted spectra using Spextool)

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