Asteroid 2024 YR4, discovered in December 2024 by NASA’s Asteroid Terrestrial-Impact Last Alert System (ATLAS), poses an extraordinary threat to Earth due to its size and uncertain dimensions. The asteroid is estimated to be between 40 and 90 meters in diameter, comparable to the Leaning Tower of Pisa, and has a 2.3% chance of hitting Earth in December 2032.
NASA’s James Webb Space Telescope (JWST) has received emergency time to observe the asteroid as it passes by Earth at just 12% of the distance to the Moon. The telescope is equipped with advanced infrared instruments that can measure the heat emitted by the asteroid, providing a clearer picture of its dimensions and surface composition.
The initial observations will take place in March 2025, followed by another in May 2025, before the asteroid becomes too far from Earth to be practically studied again until 2028. JWST’s observations will enable scientists to refine their models of the asteroid’s dimensions and determine if its surface is reflective or dark.
A 90% chance exists that the asteroid will no longer pose a credible threat by May 2025, as further observations refine its trajectory. However, with the asteroid’s unpredictable path, monitoring its movement remains crucial to ensure planetary defense systems are prepared for potential deployment.
The risk posed by 2024 YR4 has prompted global cooperation between space agencies, including NASA and the European Space Agency (ESA). A comprehensive defense strategy is being developed, which may include deflection missions or evacuation plans if the asteroid threatens populated regions.
NASA’s participation in observing 2024 YR4 represents a significant step forward in understanding and mitigating the threat posed by potentially dangerous asteroids. The JWST’s infrared technology and global collaboration among space agencies are key to securing the planet during heightened awareness of asteroid risks.
Source: https://www.ecoticias.com/en/james-webb-unexpectedly-changes-course/11457