ASTEROID TYPES & GROUPS A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site Aten group Typical orbits of Apollo-, Amor-, and Aten-type asteroids. Image credit: ESA One of the three groups of near-Earth asteroids; Atens have semimajor axes less than 1.0 AU and aphelia greater than 0.983 AU, so that they orbit mostly inside Earth’s orbit. The prototype for the group, (2062) Aten, was discovered in 1976 by the American astronomer Eleanor Helin, has a diameter of less than 1 km, and is of class S. Apoheles, whose orbits lie entirely within that of the Earth, form a subgroup of the Atens. Related category    • ASTEROIDS AND OTHER MINOR PLANETS: TYPES AND GROUPS Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP