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Fracture analysis on asteroid Ryugu

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Hayabusa2 Data Analysis Workshop

Leonard Schirner leonard.schirner@ltu.se

Lulea Technical University

11.11.2024

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  • This is me, currently in Kiruna:

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  • Lulea: University
  • Kiruna: Asteroid Engineering Laboratory

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  • But this work was done with Katharina Otto @DLR Berlin

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Nature Paper by Marco Delbo et al. May 2022:

“Alignment of fractures on Bennu’s boulders indicative of rapid asteroid surface evolution”�

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Alignment of fractures on Bennu’s boulders�indicative of rapid asteroid surface evolution – M. Delbo et al. 07/2022 �

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Alignment of fractures on Bennu’s boulders - M. Delbo et al. 07/2022 �

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Their Conclusions:

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  • Fractures on Bennu have a preferred Northwest-Southeast Orientation

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  • Fractures on Bennu likely have a thermal origin

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  • Thermal fracturing is a fast process

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Morning

East

West

Boulder

Boulder

Evening

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My Masterthesis:

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Repeat M. Delbo et al.‘s methodology for a second asteroid

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Either confirm or challenge their findings

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Asteroid Ryugu has high resolution images available and is similar to Bennu

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How to get high resolution Ryugu Images?

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Retrieve from Hayabusa2 Science Data Archive:

https://www.darts.isas.jaxa.jp/planet/project/hayabusa2/

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Select images with low orbital distance, e.g. <500 m

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Use the data in the “geo-cubes”/.dbpc files to project l2d .fit images to geo-referencend .tiff images

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-> Useable in QGIS!

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Ryugu in QGIS

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©JAXA

5 m

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©JAXA

5 m

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Ryugu in QGIS

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©JAXA

1 m

1 m

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Alignment of fractures on Ryugu’s boulders�

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My Master-Thesis:

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  • Repeat M. Delbo et al.‘s methodology for a second asteroid

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  • Either confirm or challenge their findings

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  • The influence of thermal processes on Ryugu seems to be even more pronounced than on Bennu?

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Fracture length distribution

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50.000 years on Ryugu:

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  • Ryugu‘s fractures grew in about 30-40 thousand years!?

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  • Thermal fracturing is a rapid process

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  • Potentially damages primordial signature on ancient asteroids

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Published with S. Sasaki, S. Sugita, K.A. Otto, M. Delbo, K.D. Matz in A&A:

Aligned fractures on asteroid Ryugu as an indicator of thermal fracturing

https://doi.org/10.1051/0004-6361/202348404

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7000 Watt Sun Simulator

Vacuum Chamber

Asteroid Simulant Sample

before

after

What do I do now?

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Simulate the asteroid environment very close to the sun

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Study the activity of asteroids like Destiny+ target Phaeton

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Thank you very much

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leonard.schirner@ltu.se

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References

  • Attree, N., Groussin, O., Jorda, L., et al. 2018, Astronomy and Astrophysics, 610, A76
  • Bennett, C., DellaGiustina, D., Becker, K., et al. 2021, Icarus, 357, 113690
  • Bryson, K. L., Ostrowski, D. R., & Blasizzo, A. 2018, Planetary and Space Science, 164, 85
  • Delbo, M., Libourel, G., Wilkerson, J., et al. 2014, Nature, 508, 233
  • Delbo, M., Walsh, K. J., Matonti, C., et al. 2022, Nature Geoscience, 15, 453
  • DellaGiustina, D. N., Burke, K. N., Walsh, K. J., et al. 2020, Science, 370
  • Eppes, M.-C., Willis, A., Molaro, J., Abernathy, S., & Zhou, B. 2015, Nature News
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  • Kameda, S., Suzuki, H., Takamatsu, T., et al. 2016, Space Science Reviews, 208, 17
  • Kaplan, H. H., Simon, A. A., Hamilton, V. E., et al. 2021, Astronomy and Astrophysics, 653, L1
  • Kitazato, K., Milliken, R. E., Iwata, T., et al. 2019, Science, 364, 272
  • Matonti, C., Attree, N., Groussin, O., et al. 2019, Nature Geoscience, 12, 157
  • McFadden, L., Eppes, M., Gillespie, A., & Hallet, B. 2005, GSA Bulletin, 117, 161
  • Michikami, T., Honda, C., Miyamoto, H., et al. 2019, Icarus, 331, 179

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References

  • Molaro, J. L., Byrne, S., & Langer, S. A. 2015, Journal of Geophysical Research: Planets, 120, 255
  • Molaro, J. L., Walsh, K. J., Jawin, E. R., et al. 2020, Nature Communications, 11
  • Nakamura, T., Matsumoto, M., Amano, K., et al. 2023, Science, 379, eabn8671
  • Okazaki, R., Marty, B., Busemann, H., et al. 2023, Science, 379, eabo0431
  • QGIS Development Team. 2023, QGIS Geographic Information System, Open Source Geospatial Foundation
  • Saiki, T., Sawada, H., Okamoto, C., et al. 2013, Acta Astronautica, 84, 227
  • Sakatani, N., Tanaka, S., Okada, T., et al. 2021, Nature Astronomy, 5, 766
  • Saltelli, A., Ratto, M., Andres, T., et al. 2007, Global Sensitivity Analysis. The Primer (Wiley)
  • Sasaki, S., Kanda, S., Hikuchi, H., et al. 2020, in Proceedings of the 51st Lunar and Planetary Science Conference
  • Sasaki, S., Kanda, S., Hikuchi, H., et al. 2022, in Proceedings of the 34th Internation Symposium on Space Technology and�Science
  • Sugita, S. 2022, HAYABUSA2 Optical Navigation Camera (ONC)
  • Sugita, S., Honda, R., Morota, T., et al. 2019, Science, 364, eaaw0422
  • Wada, K., Grott, M., Michel, P., et al. 2018, Progress in Earth and Planetary Science, 5, 1
  • Watanabe, S.-i., Tsuda, Y., Yoshikawa, M., et al. 2017, Space Science Reviews, 208, 3

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