Near-Earth object
Videos
A near-Earth object is by definition any small Solar System body orbiting the Sun whose closest approach to the Sun is less than 1.3 times the Earth–Sun distance. This definition applies to the object
Eros PIA02923
The VLT images the very faint Near Earth Object 2009 FD
Comet Hartley 2
Potentially hazardous object
Videos
A potentially hazardous object is a near-Earth object – either an asteroid or a comet – with an orbit that can make close approaches to the Earth and which is large enough to cause significant regiona
Near-Earth object
…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 by definition considered a potentially hazardous object (PHO). Most known PHOs and NEOs are asteroids, but about a third of a percent are comets. There are over 37,000 known near-Earth asteroids (NEAs) and…
Radar image of the 350-meter PHO (308635) 2005 YU55
Pingualuit aerial 2007