Evidence of global space weathering by solar wind on asteroid 162173 Ryugu

T. Hiroi; R. E. Milliken; K. M. Robertson; C. D. Schultz; K. Amano; T. Nakamura; H. Yurimoto; T. Noguchi; R. Okazaki; H. Naraoka; H. Yabuta; K. Sakamoto; T. Yada; M. Nishimura; A. Nakato; A. Miyazaki; K. Yogata; M. Abe; T. Okada; T. Usui; M. Yoshikawa; T. Saiki; S. Tanaka; S. Nakazawa; Y. Yokota; E. Tatsumi; Y. Tsuda; S. Tachibana; T. Fuyuto; S. Watanabe; S. Sasaki; H. Kaiden; K. Kitazato; M. Matsuoka

doi:10.1016/j.icarus.2023.115755

Evidence of global space weathering by solar wind on asteroid 162173 Ryugu

T. Hiroi, R. E. Milliken, K. M. Robertson, C. D. Schultz, K. Amano, T. Nakamura, H. Yurimoto, T. Noguchi, R. Okazaki, H. Naraoka, H. Yabuta, K. Sakamoto, T. Yada, M. Nishimura, A. Nakato, A. Miyazaki, K. Yogata, M. Abe, T. Okada, T. UsuiM. Yoshikawa, T. Saiki, S. Tanaka, S. Nakazawa, Y. Yokota, E. Tatsumi, Y. Tsuda, S. Tachibana, T. Fuyuto, S. Watanabe, S. Sasaki, H. Kaiden, K. Kitazato, M. Matsuoka

Material Science of Solar Planets

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

Reflectance spectra (0.3–4 μm) of powder samples of the third largest stone C0002 returned from the asteroid Ryugu by JAXA Hayabusa2 mission were measured and compared with proximity observation data taken by the Optical Navigation Camera - Telescopic (ONC-T) and the Near-Infrared Spectrometer (NIRS3) onboard the Hayabusa2 spacecraft. Although the characteristics of the 2.7 μm absorption band due to structural hydroxyl of the Ryugu powder samples are consistent with CI1 chondrite meteorites, NIRS3 spectra of the global surface of Ryugu exhibit a wavelength shift of +6 nm in the 2.7 μm absorption band center in comparison with those of both the powder samples and an artificial crater on the asteroid formed by the Small Carry-on Impactor (SCI). This is consistent with effects of solar wind-induced space weathering being present across the global surface of asteroid Ryugu. The darkness of the Ryugu surface in comparison with the returned samples and an upturn in reflectance observed in the average ONC-T spectrum at ultraviolet wavelengths may also be due to space weathering.

Original language	English
Article number	115755
Journal	Icarus
Volume	406
DOIs	https://doi.org/10.1016/j.icarus.2023.115755
Publication status	Published - Dec 2023

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1016/j.icarus.2023.115755

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Hiroi, T., Milliken, R. E., Robertson, K. M., Schultz, C. D., Amano, K., Nakamura, T., Yurimoto, H., Noguchi, T., Okazaki, R., Naraoka, H., Yabuta, H., Sakamoto, K., Yada, T., Nishimura, M., Nakato, A., Miyazaki, A., Yogata, K., Abe, M., Okada, T., ... Matsuoka, M. (2023). Evidence of global space weathering by solar wind on asteroid 162173 Ryugu. Icarus, 406, Article 115755. https://doi.org/10.1016/j.icarus.2023.115755

Hiroi, T, Milliken, RE, Robertson, KM, Schultz, CD, Amano, K, Nakamura, T, Yurimoto, H, Noguchi, T, Okazaki, R , Naraoka, H, Yabuta, H, Sakamoto, K, Yada, T, Nishimura, M, Nakato, A, Miyazaki, A, Yogata, K, Abe, M, Okada, T, Usui, T, Yoshikawa, M, Saiki, T, Tanaka, S, Nakazawa, S, Yokota, Y, Tatsumi, E, Tsuda, Y, Tachibana, S, Fuyuto, T, Watanabe, S, Sasaki, S, Kaiden, H, Kitazato, K & Matsuoka, M 2023, 'Evidence of global space weathering by solar wind on asteroid 162173 Ryugu', Icarus, vol. 406, 115755. https://doi.org/10.1016/j.icarus.2023.115755

@article{b64c98c852e8458b9b9e2eb6d6a4b5bc,

title = "Evidence of global space weathering by solar wind on asteroid 162173 Ryugu",

abstract = "Reflectance spectra (0.3–4 μm) of powder samples of the third largest stone C0002 returned from the asteroid Ryugu by JAXA Hayabusa2 mission were measured and compared with proximity observation data taken by the Optical Navigation Camera - Telescopic (ONC-T) and the Near-Infrared Spectrometer (NIRS3) onboard the Hayabusa2 spacecraft. Although the characteristics of the 2.7 μm absorption band due to structural hydroxyl of the Ryugu powder samples are consistent with CI1 chondrite meteorites, NIRS3 spectra of the global surface of Ryugu exhibit a wavelength shift of +6 nm in the 2.7 μm absorption band center in comparison with those of both the powder samples and an artificial crater on the asteroid formed by the Small Carry-on Impactor (SCI). This is consistent with effects of solar wind-induced space weathering being present across the global surface of asteroid Ryugu. The darkness of the Ryugu surface in comparison with the returned samples and an upturn in reflectance observed in the average ONC-T spectrum at ultraviolet wavelengths may also be due to space weathering.",

keywords = "Asteroid, Meteorite, Reflectance spectroscopy, Ryugu, Space weathering",

author = "T. Hiroi and Milliken, {R. E.} and Robertson, {K. M.} and Schultz, {C. D.} and K. Amano and T. Nakamura and H. Yurimoto and T. Noguchi and R. Okazaki and H. Naraoka and H. Yabuta and K. Sakamoto and T. Yada and M. Nishimura and A. Nakato and A. Miyazaki and K. Yogata and M. Abe and T. Okada and T. Usui and M. Yoshikawa and T. Saiki and S. Tanaka and S. Nakazawa and Y. Yokota and E. Tatsumi and Y. Tsuda and S. Tachibana and T. Fuyuto and S. Watanabe and S. Sasaki and H. Kaiden and K. Kitazato and M. Matsuoka",

note = "Publisher Copyright: {\textcopyright} 2023",

year = "2023",

month = dec,

doi = "10.1016/j.icarus.2023.115755",

language = "English",

volume = "406",

journal = "Icarus",

issn = "0019-1035",

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TY - JOUR

T1 - Evidence of global space weathering by solar wind on asteroid 162173 Ryugu

AU - Hiroi, T.

AU - Milliken, R. E.

AU - Robertson, K. M.

AU - Schultz, C. D.

AU - Amano, K.

AU - Nakamura, T.

AU - Yurimoto, H.

AU - Noguchi, T.

AU - Okazaki, R.

AU - Naraoka, H.

AU - Yabuta, H.

AU - Sakamoto, K.

AU - Yada, T.

AU - Nishimura, M.

AU - Nakato, A.

AU - Miyazaki, A.

AU - Yogata, K.

AU - Abe, M.

AU - Okada, T.

AU - Usui, T.

AU - Yoshikawa, M.

AU - Saiki, T.

AU - Tanaka, S.

AU - Nakazawa, S.

AU - Yokota, Y.

AU - Tatsumi, E.

AU - Tsuda, Y.

AU - Tachibana, S.

AU - Fuyuto, T.

AU - Watanabe, S.

AU - Sasaki, S.

AU - Kaiden, H.

AU - Kitazato, K.

AU - Matsuoka, M.

PY - 2023/12

Y1 - 2023/12

N2 - Reflectance spectra (0.3–4 μm) of powder samples of the third largest stone C0002 returned from the asteroid Ryugu by JAXA Hayabusa2 mission were measured and compared with proximity observation data taken by the Optical Navigation Camera - Telescopic (ONC-T) and the Near-Infrared Spectrometer (NIRS3) onboard the Hayabusa2 spacecraft. Although the characteristics of the 2.7 μm absorption band due to structural hydroxyl of the Ryugu powder samples are consistent with CI1 chondrite meteorites, NIRS3 spectra of the global surface of Ryugu exhibit a wavelength shift of +6 nm in the 2.7 μm absorption band center in comparison with those of both the powder samples and an artificial crater on the asteroid formed by the Small Carry-on Impactor (SCI). This is consistent with effects of solar wind-induced space weathering being present across the global surface of asteroid Ryugu. The darkness of the Ryugu surface in comparison with the returned samples and an upturn in reflectance observed in the average ONC-T spectrum at ultraviolet wavelengths may also be due to space weathering.

AB - Reflectance spectra (0.3–4 μm) of powder samples of the third largest stone C0002 returned from the asteroid Ryugu by JAXA Hayabusa2 mission were measured and compared with proximity observation data taken by the Optical Navigation Camera - Telescopic (ONC-T) and the Near-Infrared Spectrometer (NIRS3) onboard the Hayabusa2 spacecraft. Although the characteristics of the 2.7 μm absorption band due to structural hydroxyl of the Ryugu powder samples are consistent with CI1 chondrite meteorites, NIRS3 spectra of the global surface of Ryugu exhibit a wavelength shift of +6 nm in the 2.7 μm absorption band center in comparison with those of both the powder samples and an artificial crater on the asteroid formed by the Small Carry-on Impactor (SCI). This is consistent with effects of solar wind-induced space weathering being present across the global surface of asteroid Ryugu. The darkness of the Ryugu surface in comparison with the returned samples and an upturn in reflectance observed in the average ONC-T spectrum at ultraviolet wavelengths may also be due to space weathering.

KW - Asteroid

KW - Meteorite

KW - Reflectance spectroscopy

KW - Ryugu

KW - Space weathering

UR - http://www.scopus.com/inward/record.url?scp=85167595306&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85167595306&partnerID=8YFLogxK

U2 - 10.1016/j.icarus.2023.115755

DO - 10.1016/j.icarus.2023.115755

M3 - Article

AN - SCOPUS:85167595306

SN - 0019-1035

VL - 406

JO - Icarus

JF - Icarus

M1 - 115755

ER -

Evidence of global space weathering by solar wind on asteroid 162173 Ryugu

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