Keywords

#near-earth_object

Near-Earth object

Small Solar System body with an orbit that can bring it close to Earth

A near-Earth object (NEO) is any small Solar System body orbiting the Sun whose closest approach to the Sun (perihelion) is less than 1.3 times the Earth–Sun distance. This definition applies to the object's orbit around the Sun, rather than its current position, thus an object with such an orbit is considered an NEO even at times when it is far from making a close approach of Earth. If an NEO's orbit crosses the Earth's orbit, and the object is larger than 140 meters (460 ft) across, it is considered a potentially hazardous object (PHO). Most known PHOs and NEOs are asteroids, but about 0.35% are comets.

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Near-Earth object Potentially hazardous object Torino scale Lowell Observatory Near-Earth-Object Search Purple Mountain Observatory Near-Earth Asteroid Tracking Campo Imperatore Near-Earth Object Survey Near Earth Object Surveillance Satellite Center for Near-Earth Object Studies List of asteroid close approaches to Earth
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