ASTEROID  GROUPS 
Tom  Whitney   245-6234    E-Mail
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Near Earth 1.3 au Orbit Perihelion
Armors Cross Mars Orbit
Apollos Earth Orbit Crossing,  > 1 yr. Orbit Period
Atens Earth Orbit Crossing,  < 1 yr. Orbit Period
Trojans 60 degree Jupiter Lagrange Point
Centarus Kuiper Belt, including Comets