Which asteroid comes closer to earth than any other body apart from the Moon?
Asteroid mining In terms of propulsion energy requirements, a mission to a near-Earth asteroid compares favorably to alternative mining missions. An example of a potential target for an early asteroid mining expedition is 4660 Nereus, expected to be mainly enstatite. This body has a very low Δv compared to lifting materials from the surface of the Moon. However it would require a much longer round-trip to return the material. Multiple types of asteroids have been identified but the three main types would include the C-type, S-type, and M-type asteroids: A class of "easily recoverable objects" (EROs) was identified by a group of
Amor asteroid 0.75), their orbits are not as eccentric as those of most Damocloids and comets, which tend to have eccentricities near 0.9. The only named Amor IV asteroid is 3552 Don Quixote; two others are numbered. As of 2018, no Amor asteroids are known to cross the orbit of Saturn. An outer Earth-grazer asteroid is an asteroid which is normally beyond Earth's orbit, but which can get closer to the Sun than Earth's aphelion (1.0167 AU), but not closer than Earth's perihelion (0.9833 AU). In other words, the asteroid's perihelion is between Earth's perihelion and aphelion. Outer Earth-grazer asteroids are split