The near-Earth asteroid population has a key role in material transportation from the main belt between Mars and Jupiter to Earth. Comprehensive studies of large asteroids have been conducted, whereas few studies focus on tiny asteroids due to observational difficulties caused by limited visibilities and large apparent motions. It is unclear whether we can use empirical relationships for tiny asteroids such as spectral type–albedo relation under completely different surface environments (weak gravity and strong centrifugal force due to a fast rotation) from larger ones. We cannot understand the nature of tiny (diameter less than 100 m) bodies correctly only from telescopic observations without reliable information. We propose visible spectroscopy and polarimetry of a near-Earth asteroid 1998 KY26 with Subaru/FOCAS. 1998 KY26 is a tiny asteroid with a diameter of 30 m and has been selected as the target of the Hayabusa2 extended mission, which will rendezvous with 1998 KY26 in 2031. The main objectives of the observations are determination of the spectral type and derivation of the geometric albedo of 1998 KY26. This is an extravagant opportunity to compare and test our knowledge of tiny bodies obtained in telescopic and in situ observations.
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