Europlanet Science Congress 2021
Virtual meeting
13 – 24 September 2021
Europlanet Science Congress 2021
Virtual meeting
13 September – 24 September 2021
EPSC Abstracts
Vol. 15, EPSC2021-564, 2021
https://doi.org/10.5194/epsc2021-564
Europlanet Science Congress 2021
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Hayabusa2 Returned Samples: First Results From the MicrOmega Investigation Within the ISAS Curation Facility

Lucie Riu1,2, Rosario Brunetto2, John Carter2, Brigitte Gondet2, Vincent Hamm2, Kentaro Hatakeda1, Yves Langevin2, Cateline Lantz2, Tania Le Pivert-Jolivet2, Damien Loizeau2, Aiko Nakatoh1, Tatsuaki Okada1, Cédric Pilorget2, François Poulet1, Tomohiro Usui1, Toru Yada1, Kasumi Yogata1, Aurélie Moussi-Soffys3, and Jean-Pierre Bibring1
Lucie Riu et al.
  • 1Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan (lriu@ias.u-psud.fr)
  • 2Institut d'Astrophysique Spatiale, Université Paris-Saclay, CNRS, 91400 Orsay, France
  • 3Centre National d'Etudes Spatiales, 18 Avenue E. Belin, 31401 Toulouse, France.

Introduction: On December 6, 2020, the Hayabusa2 mission successfully returned to Earth ~ 5.4 g of samples collected at the surface of the C-type asteroid Ruygu [1,2]. Its surface was first sampled on February 22, 2019, then on July 12, 2019, close to a 10-meter large artificial crater, so as to possibly access sub-surface material [3]. The collected samples are now kept at the Extraterrestrial Samples Curation Center of JAXA at ISAS in Sagamihara, Japan, for a first round of preliminary analyses, with the objective to characterize in a non-destructive manner both the bulk samples and a few hundreds of grains extracted from them [4]. In particular, the objective is 1) to support their further detailed characterization by the international initial analysis teams, which will start their activity in July 2021, and 2) to catalog the grains, accessible to the international community through AO selection, starting mid-2022.

The preliminary characterization of these samples is being conducted with a visible microscope with four color filters, a FTIR spectrometer operating in the 1-5 µm range and MicrOmega, a hyperspectral NIR microscope developed at Institut d'Astrophysique Spatiale (Université Paris-Saclay/CNRS, Orsay, France), operating in the near-infrared range (0.99-3.65 µm) [5]. It is noteworthy that never before have the preliminary analyses of returned extraterrestrial samples included the characterization by a NIR hyperspectral microscope.

Results: Preliminary outcomes of the analyses performed with MicrOmega will be presented at the conference. In particular, the question of the representativity of the samples collected by the Hayabusa2 spacecraft will be addressed thanks to the comparison of the spectra obtained by MicrOmega and the NIRS3 remote sensing IR spectrometer [6] which performed a spectral characterization (1.8-3.2 µm) of Ryugu's surface, including the sites of the samples' collection [7,8]. A preliminary analysis of the spatial compositional heterogeneity will be presented. Specific signatures, detected in grains typically present in <1% of the pixels, but of high relevance regarding the processes determining Ryugu formation and evolution, will also be discussed.

References: [1] Binzel R. P. et al. (2002), Physical Properties of Near-Earth Objects. pp. 255-271, [2] Vilas F. (2008) The Astronomical Journal 135 (4), 1101-1105, [3] Morota et al. (2020) Science 368, Issue 6491, pp. 654-659, [4] Yada T. et al., in preparation, [5] Bibring J.-P. et al. (2017) Astrobiology 17, Issue 6-7, pp.621-626, [6] Iwata T. et al. (2017) Space Science Reviews 208 (1-4), 317-337, [7] Kitazato K. et al. (2019) Science 364 (6437), 272-275, [8] Kitazato K. et al. (2020) Nature Astronomy, Volume 5, p. 246-250.

How to cite: Riu, L., Brunetto, R., Carter, J., Gondet, B., Hamm, V., Hatakeda, K., Langevin, Y., Lantz, C., Le Pivert-Jolivet, T., Loizeau, D., Nakatoh, A., Okada, T., Pilorget, C., Poulet, F., Usui, T., Yada, T., Yogata, K., Moussi-Soffys, A., and Bibring, J.-P.: Hayabusa2 Returned Samples: First Results From the MicrOmega Investigation Within the ISAS Curation Facility, Europlanet Science Congress 2021, online, 13–24 Sep 2021, EPSC2021-564, https://doi.org/10.5194/epsc2021-564, 2021.

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