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Efficient disruption of small asteroids by Earth's atmosphere


Accurate modelling of the interaction between the atmosphere and an incoming bolide is a complex task, but crucial to determining the fraction of small asteroids that actually hit the Earth's surface. Most semi-analytical approaches have simplified the problem by considering the impactor as a strengthless liquid-like object (‘pancake’ models1,2), but recently a more realistic model has been developed that calculates motion, aerodynamic loading and ablation for each separate particle or fragment in a disrupted impactor3,4. Here we report the results of a large number of simulations in which we use both models to develop a statistical picture of atmosphere–bolide interaction for iron and stony objects with initial diameters up to 1 km. We show that the separated-fragments model predicts the total atmospheric disruption of much larger stony bodies than previously thought. In addition, our data set of >1,000 simulated impacts, combined with the known pre-atmospheric flux of asteroids with diameters less than 1 km5,6,7,8,9,10,11,12, elucidates the flux of small bolides at the Earth's surface. We estimate that bodies >220 m in diameter will impact every 170,000 years.

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Figure 1: Results of SF and ‘pancake’ model simulations for stone and iron impactors.
Figure 2: Estimates of impact rate for both the top of the atmosphere and the Earth's surface.


  1. 1

    Chyba, C. F., Thomas, P. J. & Zahnle, K. J. The 1908 Tunguska explosion: Atmospheric disruption of a stony asteroid. Nature 361, 40–44 (1993)

    ADS  Article  Google Scholar 

  2. 2

    Hills, J. G. & Goda, M. P. The fragmentation of small asteroids in the atmosphere. Astron. J. 105, 1114–1144 (1993)

    ADS  Article  Google Scholar 

  3. 3

    Artemieva, N. A. & Shuvalov, V. V. Motion of a fragmented meteoroid through the planetary atmosphere. J. Geophys. Res. 106, 3297–3310 (2001)

    ADS  Article  Google Scholar 

  4. 4

    Shuvalov, V. V., Artemieva, N. A. & Trubetskaya, I. A. Simulating the motion of a disrupted meteoroid with allowance for evaporation. Sol. Syst. Res. 34, 49–60 (2000)

    ADS  Google Scholar 

  5. 5

    Halliday, I., Griffin, A. A. & Blackwell, A. T. Detailed data for 259 fireballs from the Canadian camera network and inferences concerning the influx of large meteoroids. Meteorit. Planet. Sci. 31, 185–217 (1996)

    ADS  CAS  Article  Google Scholar 

  6. 6

    Nemtchinov, I. V. et al. Assessment of kinetic energy of meteoroids detected by satellite-based light sensors. Icarus 130, 259–274 (1997)

    ADS  Article  Google Scholar 

  7. 7

    Brown, P., Spalding, R. E., ReVelle, D. O., Tagliaferri, E. & Worden, S. P. The flux of small near-Earth objects colliding with the Earth. Nature 420, 294–296 (2002)

    ADS  CAS  Article  Google Scholar 

  8. 8

    ReVelle, D. O. Historical detection of atmospheric impacts by large bolides using acoustic-gravity waves. Ann. NY Acad. Sci. USA 822, 284–302 (1997)

    ADS  Article  Google Scholar 

  9. 9

    Morbidelli, A., Jedicke, R., Bottke, W. F., Michel, P. & Tedesco, E. F. From magnitudes to diameters: The albedo distribution of near-Earth objects and the Earth collision hazard. Icarus 158, 329–343 (2002)

    ADS  Article  Google Scholar 

  10. 10

    Rabinowitz, D., Helin, E., Lawrence, K. & Pravdo, S. A reduced estimate of the number of kilometre-sized near-Earth asteroids. Nature 403, 165–166 (2000)

    ADS  CAS  Article  Google Scholar 

  11. 11

    Stuart, J. S. A near-Earth asteroid population estimate from the LINEAR survey. Science 294, 1691–1693 (2001)

    ADS  CAS  Article  Google Scholar 

  12. 12

    Harris, A. W. in Proc. Asteroids, Comets, Meteors 2002 (European Space Agency, Berlin, in press)

  13. 13

    Earth Impact Database 〈〉 (accessed 20 November 2002).

  14. 14

    Bus, S. J. & Binzel, R. P. Phase II of the small main-belt asteroid spectroscopic survey: A feature-based taxonomy. Icarus 158, 146–177 (2002)

    ADS  Article  Google Scholar 

  15. 15

    Binzel, R. P., Lupishko, D. F., Di Martino, M., Whiteley, R. J. & Hahn, G. J. in Asteroids III (eds Bottke, W. F., Cellino, A., Paolicchi, P. & Binzel, R. P.) 255–271 (Univ. Arizona Press, Tucson, 2003)

    Google Scholar 

  16. 16

    Tholen, D. J. in Asteroids II (eds Binzel, R. P., Gehrels, T. & Matthews, M. S.) 1139–1150 (Univ. Arizona Press, Tucson, 1989)

    Google Scholar 

  17. 17

    Grieve, R. A. F. & Shoemaker, E. M. in Hazards due to Comets and Asteroids (ed. Gehrels, T.) 417–462 (Univ. Arizona Press, Tucson, 1994)

    Google Scholar 

  18. 18

    Ivanov, B. A., Neukum, G., Bottke, W. F. & Hartmann, W. K. in Asteroids III (eds Bottke, W. F., Cellino, A., Paolicchi, P. & Binzel, R. P.) 89–101 (Univ. Arizona Press, Tucson, 2003)

    Google Scholar 

  19. 19

    Hughes, D. W. A new approach to the calculation of the cratering rate of the Earth over the last 125 ± 20 Myr. Mon. Not. R. Astron. Soc. 317, 429–437 (2000)

    ADS  Article  Google Scholar 

  20. 20

    Ward, S. N. & Asphaug, E. Asteroid impact tsunami: A probabilistic hazard assessment. Icarus 145, 64–78 (2000)

    ADS  Article  Google Scholar 

  21. 21

    Chapman, C. R. & Morrison, D. Impacts on the Earth by asteroids and comets: Assessing the hazard. Nature 367, 33–39 (1994)

    ADS  Article  Google Scholar 

  22. 22

    Morrison, D., Chapman, C. R. & Slovic, P. in Hazards due to Comets and Asteroids (ed. Gehrels, T.) 59–91 (Univ. Arizona Press, Tucson, 1994)

    Google Scholar 

  23. 23

    Passey, Q. R. & Melosh, H. J. Effects of atmospheric breakup on crater field formation. Icarus 42, 211–233 (1980)

    ADS  Article  Google Scholar 

  24. 24

    Melosh, H. J. Impact Cratering: A Geological Process (Oxford Univ. Press, Oxford, 1989)

    Google Scholar 

  25. 25

    Schmidt, R. M. & Housen, K. R. Some recent advances in the scaling of impact and explosion cratering. Int. J. Impact Eng. 5, 543–560 (1987)

    ADS  Article  Google Scholar 

  26. 26

    Ivanov, B. A., et al. in Chronology and Evolution of Mars (ed. Kallenbach, R.) 87–104 (Kluwer, Dordrecht, 2001)

    Book  Google Scholar 

  27. 27

    Hartmann, W. K. Martian cratering VI: Crater count isochrons and evidence for recent volcanism from Mars Global Surveyor. Meteorit. Planet. Sci. 34, 167–177 (1999)

    ADS  CAS  Article  Google Scholar 

  28. 28

    Bland, P. A. et al. The flux of meteorites to the Earth over the last 50,000 years. Mon. Not. R. Astron. Soc. 283, 551–565 (1996)

    ADS  CAS  Article  Google Scholar 

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We thank B. Ivanov, W. Hartmann and P. Brown for providing cratering data, flux data, and for discussions, and B. Ivanov, H. J. Melosh, V. Shuvalov, J. Morgan, E. Pierazzo and M. Gounelle for suggestions that improved earlier drafts of this manuscript. This work benefited greatly from comments and suggestions from C. Chapman. N.A. thanks RFBR for support, and P.A.B. thanks the Royal Society for support.

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Correspondence to P. A. Bland.

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Bland, P., Artemieva, N. Efficient disruption of small asteroids by Earth's atmosphere. Nature 424, 288–291 (2003).

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