LSST Simulated Observations Predict Earlier Detection of Earth Impactors

This research highlights the potential of the Vera C. Rubin Observatory's Legacy Survey of Space and Time (LSST) to significantly improve our ability to detect imminent Earth impactors. By simulating LSST observations of real metre-sized Earth impactors from the last decade, the study demonstrates that LSST would have observed a substantial portion of these objects and, with a modified linking algorithm, could have discovered a significant number of them prior to impact. The most important finding is the prediction that LSST will discover impactors approximately 4 days before impact, which is substantially earlier than the current average warning time. This increased warning time has profound implications for planetary defense, as it allows for more comprehensive telescopic follow-up, targeted fireball observations, and the development of mitigation strategies. Furthermore, the potential for precovery of impactors observed by LSST but discovered by other surveys could significantly reduce orbital and impact location uncertainties. However, it is important to note that the predicted number of discovered impactors is at the low end of previous estimations, suggesting that LSST's detection capabilities may have limitations. Future research should focus on optimizing linking algorithms and improving the overall sensitivity of LSST to maximize its effectiveness in detecting and characterizing potentially hazardous asteroids.

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