11:30 AM - 11:45 AM
[O07-08] Kitchen Earth Science' helped Hayabusa2 collect the Ryugu samples.
★Invited Papers
Keywords:asteroid, sample return, Hayabusa2, Ryugu
The Hayabusa2 spacecraft successfully returned samples from the asteroid (162173) Ryugu. The analysis of the returned samples has shown that the Ryugu sample is a reference material of the Solar System elemental abundance, and that the sample is rich in volatile components such as water and organic matter. In the development of the Hayabusa2 sampler, the goal we set was "to collect and return minimum 100 mg of samples from multiple surface locations without any terrestrial contamination, which allow us to analyze the sample with state-of-the-art techniques" [1]. A total of ~5 g of samples was safely collected from two surface locations, and we were able to start sample analysis immediately with minimal contamination [2-4]. We planned to suppress the air leakage lower than 1 Pa for 0.1-gram sample on ground, but it was found that 70 Pa of air was inside the sample container for ~5 g of the sample. Even with this amount of the air leakage, we could detect solar-wind noble gases released from the sample inside the sample container [5]. We thus conclude that the Hayabusa2 sampler worked perfectly as expected.
The development of the Hayabusa2 sampler was made through close collaboration between scientists and engineers with various expertise. The team discussed a lot intensively with respecting each other, which resulted in the wonderful achievement of the Hayabusa2 sampler. In the development of the sampler, of which design was basically the same as Hayabusa, we attempted to include some new components and make some improvements from the viewpoint of sample science [1, 6, 7]. Many tests were required to confirm that the new elements work properly and do not affect other components through large-scale (but less frequent) experiments. In order to increase the reliability of the developing components, it is desirable to obtain a large amount of basic data in simpler (but more frequent) experiments. "Kitchen earth science" experiments that can be repeated easily work quite effectively for this purpose, and in fact we made experiments using a simple microgravity generator in the development of the sampler ([8] reminds us about the experiments we made).
In this presentation, we would like to talk about what we did for the development of the Hayabusa2 sampler as an example of "Kitchen Earth Science".
[1] Tachibana S. et al. (2014) Geochem. J. 48, 571. [2] Tachibana S. et al. (2022) Science 375, 1011. [3] Yada T. et al. (2022) Nat. Astron. 6, 215. Sakamoto K. et al. (2022) Earth Planet. Space 74, 90. [5] Okazaki R. et al. (2022) Sci. Adv. 8, eabo7239. [6] Sawada H. et al. (2017) Space Sci. Rev. 208, 107. [7] Okazaki R. et al. (2017) Space Sci. Rev. 208, 81. [8] Iyohara S. (2023) 'Sora Wataru Kyoshitsu' Bungeishunju.
The development of the Hayabusa2 sampler was made through close collaboration between scientists and engineers with various expertise. The team discussed a lot intensively with respecting each other, which resulted in the wonderful achievement of the Hayabusa2 sampler. In the development of the sampler, of which design was basically the same as Hayabusa, we attempted to include some new components and make some improvements from the viewpoint of sample science [1, 6, 7]. Many tests were required to confirm that the new elements work properly and do not affect other components through large-scale (but less frequent) experiments. In order to increase the reliability of the developing components, it is desirable to obtain a large amount of basic data in simpler (but more frequent) experiments. "Kitchen earth science" experiments that can be repeated easily work quite effectively for this purpose, and in fact we made experiments using a simple microgravity generator in the development of the sampler ([8] reminds us about the experiments we made).
In this presentation, we would like to talk about what we did for the development of the Hayabusa2 sampler as an example of "Kitchen Earth Science".
[1] Tachibana S. et al. (2014) Geochem. J. 48, 571. [2] Tachibana S. et al. (2022) Science 375, 1011. [3] Yada T. et al. (2022) Nat. Astron. 6, 215. Sakamoto K. et al. (2022) Earth Planet. Space 74, 90. [5] Okazaki R. et al. (2022) Sci. Adv. 8, eabo7239. [6] Sawada H. et al. (2017) Space Sci. Rev. 208, 107. [7] Okazaki R. et al. (2017) Space Sci. Rev. 208, 81. [8] Iyohara S. (2023) 'Sora Wataru Kyoshitsu' Bungeishunju.