When should we send expeditions to look for meteorites that have impacted Earth?

There is not enough time for more close study of all fireballs observed in the sky. The observation of a bright phenomenon reveals that a meteoroid has entered the atmosphere from space, but does any part of it end up on Earth? Only those with the survived terminal mass will reach the earth, but unfortunately many of them remain undiscovered.

At the same time as we are equipping expensive space missions, we have valuable extraterrestrial specimens arriving on Earth with information about the solar system's objects. University Researcher Maria Gritsevich from the University of Helsinki and the Finnish Geospatial Research Institute compares the situation to the idea that humanity does not bother to empty its letterbox.

In their article published in The Astrophysical Journal, researchers show that the analysis of fireball observations in large datasets can be made much quicker with the help of a neat mathematical formula, the α-β criterion. The researchers applied their modelling on fireball observations recorded in Australia over the past decade. They compared their results to discovered meteorites, and found that all the discovered meteorites could be revealed by using only the observed altitude and the deceleration rate of the body in the model. In other words, their calculated terminal mass was so large that they could be expected to survive all the way to Earth's surface.

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