Asteroids

An asteroid is a minor planet—an object larger than a meteoroid (thus 1 meter or larger) that is neither a planet nor an identified comet—that orbits within the inner Solar System or is co-orbital with Jupiter (Trojan asteroids). Asteroids are rocky, metallic, or icy bodies with no atmosphere, and are broadly classified into C-type (carbonaceous), M-type (metallic), or S-type (silicaceous). The size and shape of asteroids vary significantly, ranging from small rubble piles under a kilometer across to Ceres, a dwarf planet almost 1000 km in diameter. A body is classified as a comet, not an

the circumstellar disk (accumulation of matter) in an orbit around Sun between those of Mars and Jupiter

gap or dip in the distribution of the semi-major axes of the orbits of main-belt asteroids

population of asteroids that share similar proper orbital elements

force acting on a rotating body in space caused by the anisotropic emission of thermal photons, which carry momentum

world day

bodies orbiting within the main asteroid belt which have shown cometary activity during part of their orbit

comet that lacks typical activity

methods to prevent destructive asteroid hits

second-order variation on the Yarkovsky effect that changes the rotation rate of a small body

proposed concepts for the human colonization of the asteroids

time between earliest and latest observations of a Solar System body like an asteroid or comet

region of a large body's orbit that could cause a small body to collide with it

celestial body from which originates a meteorite or a class of meteorites

Astronomical parameters

orbital insertion of an asteroid around a larger planetary body

proportionality of orbital periods for two celestial bodies

Procedure to determine asteroid masses