Asteroid 2024 YR4 No Longer Threatens Earth Moon
Why in the News ?
Scientists from NASA’s Centre for Near-Earth Object Studies (CNEOS) have confirmed that asteroid 2024 YR4, previously suspected to have a small chance of colliding with the Moon in 2032, will safely pass by after new observations from the James Webb Space Telescope refined its orbit.
Asteroid 2024 YR4: Updated Observations Remove Impact Risk
- Asteroid 2024 YR4, discovered in late 2024, initially raised concern among astronomers because early orbital models indicated a 3.8%–4.3% probability of impacting the Moon on December 22, 2032.
- Scientists from NASA’s Centre for Near-Earth Object Studies (CNEOS) conducted detailed tracking of the asteroid to better determine its trajectory.
- Using the James Webb Space Telescope (JWST), researchers made two key observations while the asteroid appeared extremely faint, which significantly improved calculations of its orbital path.
- The refined data shows that the asteroid will pass the Moon safely at a distance of around 21,200 kilometres, eliminating fears of a lunar collision.
- Earlier assessments had also suggested a possible impact risk with Earth, but updated calculations have now ruled out any threat to Earth for at least the next century.
Understanding How Asteroid Risk Assessments Change
- When a near-Earth object (NEO) is first discovered, astronomers initially have limited observational data, making early orbital predictions uncertain.
- Initial calculations often produce multiple possible trajectories, which can sometimes include small probabilities of collisions with celestial bodies.
- As scientists gather additional observations over time, they refine the asteroid’s orbit and velocity measurements, narrowing down possible future paths.
- In the case of asteroid 2024 YR4, the improved observations from JWST allowed researchers to eliminate previously suspected impact scenarios.
- Experts emphasise that such changes in impact probabilities are a normal part of planetary defence monitoring, reflecting improved scientific accuracy.
About Near-Earth Objects and Planetary Defence:● Near-Earth Objects (NEOs) are asteroids or comets whose orbits bring them close to Earth’s orbit around the Sun. ● Objects larger than 140 metres are considered Potentially Hazardous Asteroids (PHAs) if they come within 7.5 million kilometres of Earth. ● NASA’s Centre for Near-Earth Object Studies (CNEOS) monitors asteroid trajectories and calculates possible impact risks. ● International planetary defence efforts include programs such as NASA’s Planetary Defense Coordination Office (PDCO) and global asteroid monitoring networks. ● Missions like NASA’s DART (Double Asteroid Redirection Test) demonstrate techniques to deflect potentially dangerous asteroids. ● Continuous observation using advanced telescopes such as the James Webb Space Telescope helps scientists detect, track, and evaluate potential asteroid threats, improving Earth’s planetary defence capabilities. |