![]() ![]() While 2021 SM3 qualifies on these criteria, it fails to make the PHA list kept by CNEOS known as the Sentry Table as it has been ruled out from impacting Earth for at least 100 years. This allows them to calculate which NEO asteroids are also Potentially Hazardous Asteroids (PHAs).Ī PHA is an asteroid with a diameter greater than about 140 meters and comes with about 4.5 million miles of our planet. ![]() The agency's Center for Near-Earth Object Studies (CNEOS) defines NEOs as comets and asteroids that have been nudged by the gravitational attraction of nearby planets into orbits that bring them into the Earth's neighborhood.ĬNEOS uses observations of asteroid orbits to calculate their trajectory through the solar system, charting their progress from 1900 forward until 2200.
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