Source: TH
Context: NASA updated its projections for asteroid 2024 YR4, reducing its chances of striking Earth but noting a 3.8% probability of colliding with the Moon on December 22, 2032.
About Asteroid YR4:
- What is Asteroid YR4?
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- Discovery: Identified in December 2024 by the ATLAS telescope in Chile as a near-Earth object (NEO).
- Type: Near-Earth asteroid with a solar orbit that brings it within 1.3 AU of the Sun.
- Size Estimate: Approximately 65 meters wide, comparable to a 10-storey building.
- Notable Alert: Initially triggered NASA’s highest-ever impact alert in February 2025 (3.1% Earth impact probability), later revised to negligible.
- Potential Impact & Risk:
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- Earth Risk: Now considered no significant threat to Earth based on updated trajectory data.
- Moon Risk: Holds a 3.8% chance of hitting the Moon in 2032; 96.2% chance it will miss.
- Impact Effects: If it strikes, it could create a 500–2,000-meter crater and release energy 340x the Hiroshima bomb.
- Scientific and Strategic Significance:
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- Planetary Defense: Highlights importance of automated detection and early warning systems for NEOs.
- Observation Opportunity: If YR4 hits the Moon’s near side, spacecraft like Chandrayaan-2 could observe the impact flash.
- Asteroid Monitoring: Underlines ongoing risks from small-to-medium-sized space rocks, like the Chelyabinsk event (2013).
- Public Awareness: Reinforces the fact that asteroids are the only natural disaster we can prevent, according to experts.
