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The Toutatis (4179) Boulders: Shallow Slope in Size Distribution and Shape Statistics

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Abstract

Asteroid surface boulders contain important information about the origin and geological evolution of asteroids. Previous insights into boulders on the surface of Toutatis are based on direct measurements from two-dimensional images, the accuracy of these measurements needs to be further improved. Therefore, this study uses radar shape models to correct the dimensions of those Toutatis boulders with well-defined contours. 22 boulders are corrected and their distributions before correction have similar statistics to those boulders (222 in total) in Jiang et al. (2015). We re-examine the size and shape distributions of these corrected boulders and results show that the power-law index of boulders larger than 40 m, –1.27 ± 0.05, is relatively flatter than that of other asteroids that have been observed by spacecrafts. If this index represents the distribution pattern of boulders larger than a few meters across on the Toutatis surface, it suggests that Toutatis may have undergone fewer and weaker fragmentation processes during its past than other spacecraft-detected NEAs, which further suggests that the boulders on the Toutatis surface are in a unique state of preservation. We also find that these boulders have an apparent axis ratio of 0.7, which predicts that most of the boulders on the Toutatis surface are in a gravitationally stable state. In addition, these larger boulders on the Toutatis surface are mainly distributed at the junction of the body and the head, it is possible that they were produced by sputtering during the low-velocity impact between the head and the body. High-resolution optical images and computer simulations in the future will be of great help in deeply understanding the origin and geological evolution of Toutatis.

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REFERENCES

  1. Ballouz, R. L., et al., Bennu’s near-Earth lifetime of 1.75 million years inferred from craters on its boulders, Nature, 2020, vol. 587, pp. 205–209.

    Article  ADS  Google Scholar 

  2. Capaccioni, F., et al., Asteroidal catastrophic collisions simulated by hypervelocity impact experiments, Icarus, 1986, vol. 66, pp. 487–514.

    Article  ADS  Google Scholar 

  3. Capaccioni, F., et al., Shapes of asteroids compared with fragments from hypervelocity impact experiments, Nature, 1984, vol. 308, pp. 832–834.

    Article  ADS  Google Scholar 

  4. Chapman, C.R., Merline, W.J., Thomas, P.C., Joseph, J., Cheng, A.F., and Izenberg, N., Impact history of Eros: Craters and boulders, Icarus, 2002, vol. 155, pp. 104–118.

    Article  ADS  Google Scholar 

  5. Crater analysis techniques working group, Standard techniques for presentation and analysis of crater size-frequency data, Icarus, 1979, vol. 37, pp. 467–474.

  6. Delbo, M., et al., Thermal fatigue as the origin of regolith on small asteroids, Nature, 2014, vol. 508, pp. 233–236.

    Article  ADS  Google Scholar 

  7. DellaGiustina, D.N., et al., Properties of rubble-pile asteroid (101955) Bennu from OSIRIS-REx imaging and thermal analysis, Nat. Astron., 2019, vol. 3, pp. 341–351.

    Article  ADS  Google Scholar 

  8. Fujiwara, A., Kamimoto, G., and Tsukamoto, A., Expected shape distribution of asteroids obtained from laboratory impact experiments, Nature, 1978, vol. 272, pp. 602–603.

    Article  ADS  Google Scholar 

  9. Fujiwara, A., et al., The rubble-pile asteroid Itokawa as observed by Hayabusa, Science, 2006, vol. 312, pp. 1330–1334.

    Article  ADS  Google Scholar 

  10. Hartmann, W.K., Terrestrial, lunar, and interplanetary rock fragmentation, Icarus, 1969, vol. 10, pp. 201–213.

    Article  ADS  Google Scholar 

  11. Hu, S., Ji, J., Richardson, D. C., Zhao, Y., and Zhang, Y., The formation mechanism of 4179 Toutatis’ elongated bilobed structure in a close Earth encounter scenario, Mon. Not. R. Astron. Soc., 2018, vol. 478, pp. 501–515.

    Article  ADS  Google Scholar 

  12. Huang, J., et al., The ginger-shaped asteroid 4179 Toutatis: New observations from a successful flyby of Chang’e-2, Sci. Rep., 2013, vol. 3, p. 3411.

    Article  Google Scholar 

  13. Hudson, R.S., Ostro, S.J., and Scheeres, D.J., High-resolution model of asteroid 4179 Toutatis, Icarus, 2003, vol. 161, pp. 346–355.

    Article  ADS  Google Scholar 

  14. Jiang, Y., Ji, J., Huang, J., Marchi, S., Li, Y., and Ip, W.-H., Boulders on asteroid Toutatis as observed by Chang’e-2, Sci. Rep., 2015, vol. 5, p. 16029.

    Article  ADS  Google Scholar 

  15. Kadono, T., Tanigawa, T., Kurosawa, K., Okamoto, T., Matsui, T., and Mizutani, H., Correlation between fragment shape and mass distributions in impact disruption, Icarus, 2018, vol. 309, pp. 260–264.

    Article  ADS  Google Scholar 

  16. Küppers, M., et al., Boulders on Lutetia, Planet. Space Sci., 2012, vol. 66, pp. 71–78.

    Article  ADS  Google Scholar 

  17. Lauretta, D.S., et al., The unexpected surface of asteroid (101955) Bennu, Nature, 2019, vol. 568, pp. 55–60.

    Article  ADS  Google Scholar 

  18. Li, Y., Basilevsky, A.T., Xie, M., and Ip, W.-H., Shape of boulders ejected from small lunar impact craters, Planet. Space Sci., 2017, vol. 145, pp. 71–77.

    Article  ADS  Google Scholar 

  19. Mazrouei, S., Daly, M.G., Barnouin, O.S., Ernst, C.M., and DeSouza, I., Block distributions on Itokawa, Icarus, 2014, vol. 229, pp. 181–189.

    Article  ADS  Google Scholar 

  20. Michel, P., O’Brien, D. P., Abe, S., and Hirata, N., Itokawa’s cratering record as observed by Hayabusa: Implications for its age and collisional history, Icarus, 2009, vol. 200, pp. 503–513.

    Article  ADS  Google Scholar 

  21. Michikami, T. and Hagermann, A., Boulder sizes and shapes on asteroids: A comparative study of Eros, Itokawa and Ryugu, Icarus, 2021, vol. 357, p. 114282.

    Article  Google Scholar 

  22. Michikami, T., et al., Fragment shapes in impact experiments ranging from cratering to catastrophic disruption, Icarus, 2016, vol. 264, pp. 316–330.

    Article  ADS  Google Scholar 

  23. Michikami, T., et al., Influence of petrographic textures on the shapes of impact experiment fine fragments measuring several tens of microns: Comparison with Itokawa regolith particles, Icarus, 2018, vol. 302, pp. 109–125.

    Article  ADS  Google Scholar 

  24. Michikami, T., et al., Boulder size and shape distributions on asteroid Ryugu, Icarus, 2019, vol. 331, pp. 179–191.

    Article  ADS  Google Scholar 

  25. Miyamoto, H., et al., Regolith migration and sorting on asteroid Itokawa, Science, 2007, vol. 316, pp. 1011–1014.

    Article  ADS  Google Scholar 

  26. Tancredi, G., Roland, S., Bruzzone, S., Distribution of boulders and the gravity potential on asteroid Itokawa, Icarus, 2015, vol. 247, pp. 279–290.

    Article  ADS  Google Scholar 

  27. Thomas, P.C., Veverka, J., Robinson, M.S., and Murchie, S., Shoemaker crater as the source of most ejecta blocks on the asteroid 433 Eros, Nature, 2001, vol. 413, pp. 394–396.

    Article  ADS  Google Scholar 

  28. Veverka, J., et al., NEAR at Eros: Imaging and spectral results, Science, 2000, vol. 289, pp. 2088–2097.

    Article  ADS  Google Scholar 

  29. Watanabe, S., et al., Hayabusa2 arrives at the carbonaceous asteroid 162173 Ryugu—a spinning top-shaped rubble pile, Science, 2019, vol. 364, pp. 268–272.

    Article  ADS  Google Scholar 

  30. Zhao, Y., Hu, S., Wang, S., and Ji, J., Calculation of the gravity field on the surface of irregular small bodies using the volume discretization method, Astron. J., 2015, vol. 56, p. 9.

    Google Scholar 

  31. Zou, X., Li, C., Liu, J., Wang, W., Li, H., and Ping, J., The preliminary analysis of the 4179 Toutatis snapshots of the Chang’E-2 flyby, Icarus, 2014, vol. 229, pp. 348–354.

    Article  ADS  Google Scholar 

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Funding

YL was supported from the Natural Science Research of Jiangsu Higher Education Institutions of China (Grant no. 20KJD160001). YZ was supported from the National Natural Science Foundation of China (Grant nos.: 12222307, 12073084).

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Authors and Affiliations

  1. Suzhou Vocational University, 215009, Suzhou, China

    Yuan Li

  2. Key Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, 210008, Nanjing, China

    YuHui Zhao

  3. CAS Center for Excellence in Comparative Planetology, Chinese Academy of Sciences, 230026, Hefei, China

    YuHui Zhao

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  1. Yuan Li
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Correspondence to Yuan Li.

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Li, Y., Zhao, Y. The Toutatis (4179) Boulders: Shallow Slope in Size Distribution and Shape Statistics. Sol Syst Res 57, 495–504 (2023). https://doi.org/10.1134/S0038094623050088

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  • DOI: https://doi.org/10.1134/S0038094623050088

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