Linked from
The 15 pages that link to Near-Earth object, each with the reason it gives.
Impact eventNarrower topic: These bodies are monitored because some could collide with Earth.
Tunguska eventRelated: Objects on near-Earth orbits can produce Tunguska-scale airbursts.
Asteroid collisionRelated: Collisions can redirect fragments into near-Earth space.
4 VestaRelated: Some Vesta fragments reach near-Earth space after orbital perturbations.
433 ErosNarrower topic: Eros belongs to this population because its solar orbit approaches Earth’s.