Chemical assessment of the explosive chamber in the projector system of Hayabusa2 for asteroid sampling

We report a chemical assessment of the explosive chamber in the projector system used during the sampling operation of the Hayabusa2 project at the surface of the C-type asteroid Ryugu. Although the explosion process was designed as a closed system, volatile combustion gases and semivolatile organic...

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Published in:Earth, planets, and space planets, and space, 2020-07, Vol.72 (1), p.1-17, Article 97
Main Authors: Takano, Yoshinori, Yamada, Keita, Okamoto, Chisato, Sawada, Hirotaka, Okazaki, Ryuji, Sakamoto, Kanako, Kebukawa, Yoko, Kiryu, Kento, Shibuya, Takazo, Igisu, Motoko, Yano, Hajime, Tachibana, Shogo
Format: Article
Language:English
Subjects:
7. Planetary science
Abiogenic organic molecules
Aliphatic and aromatic hydrocarbons
Aliphatic compounds
Alkanes
Analysis
Aromatic compounds
Aromatic hydrocarbons
Asteroids
Chemical composition
Combustion
Earth and Environmental Science
Earth Sciences
Energetic reaction with quenching effect
Explosion products
Gas chromatography
Gases
Geology
Geophysics/Geodesy
Japanese spacecraft
Mass spectrometry
Nominal and off-nominal assessment
Observations
Potassium
Pyrene
Quality assurance
Quality control
Sampling
Solid phases
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creator Takano, Yoshinori
Yamada, Keita
Okamoto, Chisato
Sawada, Hirotaka
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Kiryu, Kento
Shibuya, Takazo
Igisu, Motoko
Yano, Hajime
Tachibana, Shogo
description We report a chemical assessment of the explosive chamber in the projector system used during the sampling operation of the Hayabusa2 project at the surface of the C-type asteroid Ryugu. Although the explosion process was designed as a closed system, volatile combustion gases and semivolatile organics were produced together with quenched carbonaceous product. The chemical compositions of the gases, organics, and inorganics were investigated in the screening analysis. A solid-phase microextraction technique and thermal desorption coupled with gas chromatography/mass spectrometry analysis revealed that aliphatic ( three rings > four rings, resulting in abiogenic molecular patterns. The most intense inorganic fingerprints were due to potassium (K + ) and chloride (Cl – ) ions derived from the initial KTB explosive and RK ignition charge. We discuss quality control and quality assurance issues applicable to future sample processes during the Hayabusa2 project.
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Although the explosion process was designed as a closed system, volatile combustion gases and semivolatile organics were produced together with quenched carbonaceous product. The chemical compositions of the gases, organics, and inorganics were investigated in the screening analysis. A solid-phase microextraction technique and thermal desorption coupled with gas chromatography/mass spectrometry analysis revealed that aliphatic (&lt; C 20 n -alkanes) and aromatic (&lt; pyrene) hydrocarbons were produced in the closed chamber system. The aromatic ring compositions of the latter showed a semilogarithmic decrease: one ring &gt; two rings &gt; three rings &gt; four rings, resulting in abiogenic molecular patterns. The most intense inorganic fingerprints were due to potassium (K + ) and chloride (Cl – ) ions derived from the initial KTB explosive and RK ignition charge. 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subjects 7. Planetary science
Abiogenic organic molecules
Aliphatic and aromatic hydrocarbons
Aliphatic compounds
Alkanes
Analysis
Aromatic compounds
Aromatic hydrocarbons
Asteroids
Chemical composition
Combustion
Earth and Environmental Science
Earth Sciences
Energetic reaction with quenching effect
Explosion products
Gas chromatography
Gases
Geology
Geophysics/Geodesy
Japanese spacecraft
Mass spectrometry
Nominal and off-nominal assessment
Observations
Potassium
Pyrene
Quality assurance
Quality control
Sampling
Solid phases
title Chemical assessment of the explosive chamber in the projector system of Hayabusa2 for asteroid sampling
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