Study Suggests Earth's Co-orbital Asteroids Likely Originated from Main Belt, Not Moon
A new study published in the journal Icarus challenges the hypothesis that Earth's co-orbital asteroids, such as Kamo'oalewa, are fragments blasted from the Moon. While spectral analysis previously suggested these objects matched lunar silicates, researchers Elisa Alessi and Robert Jedicke used supercomputer simulations to model the orbital dynamics of debris ejected from the lunar surface. Their findings indicate that the energy required to launch a rock into a stable co-orbital path is immense, making a lunar origin statistically unlikely, with a probability of only 4.3% for objects larger than 10 meters. In contrast, simulations using the NEOMOD3 model suggest the main asteroid belt is a far more probable source, potentially supplying around 1,600 such co-orbitals. The debate may soon be resolved by China's Tianwen-2 mission, which launched in May 2025 and is currently approaching Kamo'oalewa to collect surface samples. If the samples prove to be lunar material, it would necessitate a significant revision of current understanding regarding lunar impact mechanics and crater-scaling laws.
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