Debris From DART Could Hit Earth And Mars Within A Decade, Say Scientists

Arthur T Knackerbracket has processed the following story:

On Sept. 26th, 2022, NASA's Double Asteroids Redirect Test (DART) collided with Dimorphos, the small moonlet orbiting the larger asteroid Didymos. In so doing, the mission successfully demonstrated a proposed strategy for deflecting potentially hazardous asteroids (PHAs)-the kinetic impact method.

By October 2026, the ESA's Hera mission will rendezvous with the double-asteroid system and perform a detailed post-impact survey of Dimorphos to ensure that this method of planetary defense can be repeated in the future.

However, while the kinetic method could successfully deflect asteroids so they don't threaten Earth, it could also create debris that might reach Earth and other celestial bodies.

In a recent study, an international team of scientists explored how this impact test also presents an opportunity to observe how this debris could someday reach Earth and Mars as meteors. After conducting a series of dynamic simulations, they concluded that the asteroid ejecta could reach Mars and the Earth-Moon system within a decade.

[...] The paper that details their findings appears online on the arXiv preprint server and has been accepted for publication by The Planetary Science Journal.

For their study, Pena-Asensio and his colleagues relied on data obtained by the Light Italian CubeSat for Imaging of Asteroids (LICIACube), which accompanied the DART mission and witnessed the kinetic impact test.

[...] "LICIACube provided crucial data on the shape and direction of the ejecta cone immediately following the collision. In our simulation, the particles ranged in size from 10 centimeters to 30 micrometers, with the lower range representing the smallest sizes capable of producing observable meteors on Earth with current technology. The upper range was limited by the fact that only ejected centimeter-sized fragments were observed."

Their results indicated that some of these particles would reach Earth and Mars within a decade or more, depending on how fast they traveled after the impact.

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