Albedo: The ratio of reflected sunlight to incident sunlight. Given an albedo and the distances of the asteroid from the Sun and the observer, the size of an object can be estimated from its brightness.

 

Asteroid taxonomy: Asteroid taxonomies are classification systems that allow to group asteroids into classes on the basis of their reflectance spectra. Each class is thought to correspond to one (or more) physical compositions of the surface layers of the object. Various taxonomical systems have been developed over the years, mostly based on d