2024 YR4 Monitoring NASA Asteroid 2024 YR4 Planetary Defense Collision Probability Mitigation Strategies Small Asteroids Potentially Hazardous Objects Asteroid Apophis Earth Impact Probability Tracking Methods Torino Impact Scale Detection Methods Earth Threats Moon Impact Palermo Scale Collision Course Preventive Measures Detection Challenges NASA Studies Safety Measures 2025 OW Monitoring Efforts Disintegration in Atmosphere Satellite Safety Earth Impact Planetary Protection Tracking and Prediction Data Analysis Emergency Preparedness Collision Mitigation Regional Damage Apophis Trajectory Calculation Monitoring Systems NASA Tracking Monitoring and Deflection Trajectory Calculations Observation YR4 Asteroid
Officials say the near‑term risk is a large detection gap with no deflection mission on standby.
