Category
page 1Minor planets
asteroid
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
dwarf planet
planetary-mass object in hydrostatic equilibrium which is not a satellite of another one, but which has still not significantly cleared its neighborhood to dominate it gravitationally and maintain its cohesion
Oort cloud
theoretical cloud of planetesimals at the far edge of the solar system
small Solar System body
object in the Solar System that is neither a planet, nor a dwarf planet, nor a satellite
minor planet
astronomical object in direct orbit around the Sun that is neither a planet nor a comet
Minor planet designation
number-name combination assigned to minor planets
Hills cloud
location in the extreme Solar System
provisional designation in astronomy
designation of an astronomical body after its discovery and before its official name