Calculateur d'Énergie d'Impact d'Astéroïde — Formule

Asteroid Impact Energy

The kinetic energy of a spherical impactor:

KE = 0.5 × m × v²

where m = (π/6) × d³ × ρ (sphere mass)

  • d = diameter
  • ρ = density (rock: ~3000, iron: ~7800 kg/m³)
  • v = impact velocity (typical 15-25 km/s for near-Earth asteroids)

    • 1 megaton TNT = 4.184 × 10¹⁵ J. The Chicxulub impactor (~10 km) released ~10¹⁴ Mt.

    Exemple Résolu

    A 100 m rocky asteroid at 20 km/s.

    1. Mass = (π/6) × 100³ × 3000 = 1.571e9 kg
    2. KE = 0.5 × 1.571e9 × (20000)²
    3. = 0.5 × 1.571e9 × 4e8 = 3.14e17 J
    4. ≈ 75 megatons TNT (larger than any nuclear weapon tested)