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| 日時： | 2022年9月9日（金） 17:30-18:30 |
| 場所： | オンライン開催 |
| 講演： | Spectroscopy of the asteroid Ryugu: Access to the records of our ancient Solar System |
| Dr. Eri Tatsumi (Instituto de Astrofísica de Canarias, Spain) 巽 瑛理 氏 （カナリア天体物理学研究所） |
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| 要旨： | Asteroids are building blocks of planets and keep the compositional information of the early Solar System. Especially the primitive asteroids, which are characterized by dark surfaces, are the key for water and organics on the Earth. My approach to constrain the composition and its evolusion on asteroids is the telescopic and remote-sensing observations. Recently the Hayabusa2 spacecraft by JAXA brought the sample materials from the primitive asteroid (162173) Ryugu. The sample return mission can connect the spectroscopic information to the compositional information directly, which gives strong constrains to our knowledge of the ancient Solar System. In this talk, the spectroscopic results of Ryugu from the Hayabusa2 remote-sensing observations and ground-based observations will be discussed. The Hayabusa2 spacecraft equipped the multi-band Optical Navigation Camera (ONC) which mapped the whole surface of Ryugu up to 5 cm/pix in visible wavelengths. Using the images obtained by ONC, we could extract the evolutional history of Ryugu such as the parent body history, the impact history, and the recent trajectry changes. Besides, it is important to put the asteroid in the context of the Solar System. To do this, we investigated the distribution of the asteroids which have the similar spectral feature to Ryugu. Especially the UV region is useful to characterize hydrated minerals on asteroids. We found the very peculiar distribution of the asteroid with the spectral feature similar to Ryugu. Connecting the spectra to the material information which will be brought from the Ryugu sample analyses will make a new compositional map of the Solar System. |