“…For this reason, some studies are ongoing to improve the model, adding more data points or introducing some physical equations (e.g., the momentum conservation) [28,29]. However, at the moment no better breakup model is available and the NASA model can be considered as a standard as it is the most used in space debris models [30] (Legend, Master, Damage). Moreover, the analytical method proposed here does not rely on a specific breakup model: any alternative model, as for example Impact [31], can be implemented changing only the first block shown in Figure 1, whereas the other blocks would not require any modification.…”