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afelica distance, Q: the point in the orbit of an object in which it is farthest from the Sun. albedo: relationship between the amount of light that gets a star or a surface and part of the light that is reflected by the same. Alfa (?): see phase angle. Love: class of asteroids approaching Earth, whose orbits do not cross that of Earth.

Apollo: class of asteroids approaching Earth, whose orbits cross that of Earth. phase angle: for objects in the Solar system, the angle between the Earth and the Sun as seen from the object. argument of perihelion: angle from the plane of the orbit from the ascending node to the perihelion, measured in the direction of the movement. Astrometry: accurate measurement of the position of astronomical objects, usually with respect to standard catalog of stellar positions. For computations of orbits of asteroids are considered acceptable measures with an error of 1? or 2? (1 or 2 arcseconds) ATEN: class of asteroid approaching Earth, whose orbits cross that of Earth at Aphelion. AU: astronomical unit, distance average Tierra-Sol, 149.597.870 km. B (1.0): absolute magnitude in the blue band. absorption bands: dark lines superimposed on the continuous spectrum.

Beta (?): see coefficient of phase. Centaurs: family of objects about halfway between asteroids and comets. asteroid belt: region of space between Mars and Jupiter where the vast majority of asteroids are located. phase coefficient: Cadence that varies the size of an asteroid with the phase angle, in units of mag/degrees. coma: diffuse region of gas around the nucleus of a comet. comensurabilidad: an orbital configuration where two bodies orbiting a common barycenter (Sun) when the period one is one rational fraction of the other. chondrite: meteorites with Chondrules. carbonaceous Chondrites: rare type of meteorite characterized by the presence of carbon compounds.

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