YR4
Context: Asteroid 2024 YR4, approximately 65 meters wide, was initially flagged as a potential Earth impact threat for 2032 but now poses no significant risk to Earth; however, it retains a 3.8% chance of colliding with the Moon on December 22, 2032, potentially creating a crater up to 2 kilometers wide.
Important Pointers:
Discovery: Detected in December 2024, passed at a distance of ~800,000 km from Earth, nearly twice the distance to the Moon
Observation Window: Remained visible until April 2025; set to reappear in 2028
Classification: Rated Level 3 on the Torino Scale by NASA — indicates a credible, though low, chance of localized impact damage
Energy Potential: Could release 8–10 megatons of energy if it impacts — far greater than the 2013 Chelyabinsk meteor (~500 kilotons)
Chelyabinsk Comparison: The Chelyabinsk meteor explosion released energy ~30 times that of the Hiroshima atomic bomb
Torino Scale: Developed by the International Astronomical Union (IAU) in 1999; ranks asteroid threat on a 0 to 10 scale based on probability and impact energy
Asteroids:
Rocky, airless remnants from the early solar system (~4.6 billion years ago)
Mostly found in the Asteroid Belt (between Mars and Jupiter)
Some are Near-Earth Objects (NEOs) — with orbits that cross Earth’s path
Sizes range from a few meters to hundreds of kilometers