(1)The target was a simulated spacecraft wall [5].

(1)The target was a simulated spacecraft wall [5].

Based on the new analysis, fragments from a collision follow a single power-law size distribution:

cum tot where Ncum is the number of fragments greater than diameter L (in meters), and Ml0, is the total mass (in kg) of the fragments. For a catastrophic collision, Mtot is the sum of the target and projectile masses while for a non-catastrophic collision:

Mlol=mpro.cmexVi2mpaa/(krn/sy (5)

A catastrophic collision occurs when the ratio of impact kinetic energy to target mass exceeds 40 J/g [7], The size distributions of the events listed in Table 2 and the predicted size distributions from the new model are shown in Figure 2. The fall-off of P78 fragments is due to the sensitivity limit of the radar. Overall, the new model produces results, extended over 5 orders of magnitude, that agree well with the data. Simulations of EVOLVE with the new breakup model also show good agreement with the NASA Haystack radar observations of the current debris spatial density distribution in the LEO region.

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