The near-Earth objects and their potential threat to our planet

  title={The near-Earth objects and their potential threat to our planet},
  author={D. Perna and M. Barucci and M. Fulchignoni},
  journal={The Astronomy and Astrophysics Review},
The near-Earth object (NEO) population includes both asteroids (NEAs) and comet nuclei (NECs) whose orbits have perihelion distances q<1.3 AU and which can approach or cross that of the Earth. A NEA is defined as a “potentially hazardous asteroid” (PHA) for Earth when its minimum orbit intersection distance (MOID) comes inside 0.05 AU and it has an absolute magnitude H<22 mag (i.e. mean diameter > 140 m). These are big enough to cause, in the case of impact with Earth, destructive effects on a… Expand
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