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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
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Assessing the debris generated by the small carry-on impactor operated from the Hayabusa2 mission

Motoo Ito, Yoshinori Takano, Yoko Kebukawa, Takuji Ohigashi, Moe Matsuoka, Kento Kiryu, Masayuki Uesugi, Tomoki Nakamura, Hayato Yuzawa, Keita Yamada, Hiroshi Naraoka, Toru Yada, Masanao Abe, Masahiko Hayakawa, Takanao Saiki, Shogo Tachibana, Hayabusa II Project Team
Geochemical Journal, Vol. 55, No. 4, P. 223-239, 2021

ABSTRACT

We have analyzed the carbonaceous materials generated by the explosion of an High-melting explosive mixture in an Ar atmosphere in a laboratory simulation of the small carry-on impactor experiment. We used both non-destructive and destructive analytical techniques to identify the chemical nature of the materials. From SEM-EDS, we found the materials to be composed mainly of carbon, nitrogen, and oxygen, with a detectable amount of metals. Suitable parameters for identifying these materials are a FTIR peak at 1520 cm-1, low reflectance and gentle red slope of FTIR spectrum compared with the Murchison CM2 chondrite, the Raman D and G bands, and the hydrogen, carbon, and nitrogen isotopic compositions and their spatial distributions. The scanning transmission X-ray microscopy (STXM)-XANES results provided information about the molecular nature of these highly aromatic materials, which was supported by results from TD-GC/MS. These results suggest that it is possible to distinguish Ryugu samples from SCI potential contaminants in a sample container by using proper combinations of analytical techniques. This assessment provides information that will be useful for the analysis of the Ryugu asteroidal samples.

KEYWORDS

C-type asteroid Ryugu, Hayabusa2 mission, off-nominal assessment, small carry-on Impactor, carbonaceous materials

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