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Home > Potentially hazardous asteroid

 
A Potentially Hazardous Asteroid (PHA) is a Near-Earth asteroid that can come very close to the Earth and is big enough to cause at least a region-wide catastrophe if it were to hit the Earth. An asteroid is considered a PHA if its Earth MOID (Minimum Orbit Intersection Distance) is less than 0.05au and its absolute magnitude is greater than 22. By this definition, PHAs are usually bigger than 150m. Asteroid_groups_and_families


The Minor Planets
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(For other objects and regions, see: Binary asteroids, Asteroid moons and the Solar system)
(For a complete listing, see: List of asteroids)
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Potentially hazardous asteroidA Potentially Hazardous Asteroid (PHA) is a Near-Earth asteroid that can come very close to the Earth and is big enough to cause at least a region-wide catastrophe if it were to hit the Earth. An asteroid is considered a PHA if its Earth MOID (Minimum Orb  
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