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physical object > natural object > celestial body > asteroid > Earth-crossing asteroid > Apollo asteroid > Apollo
UpApollo asteroid

Apollo comparison table
Subject is a kind of is an instance of has orbital period has inclination has semi-major axi has definition has eccentricity
Apollo asteroidEarth-crossing asteroid    One of a small group of asteroids whose orbits intersect that of Earth. They are named for the prototype, Apollo. 
Apollo Apollo asteroidP = 622di = 6°.4a = 1.486 AUPrototype of a small group of asteroids whose orbits intersect that of Earth.e = 0.57

UpApollo asteroid