Other Definitions
apollo asteroid (dict)
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Apollo AsteroidThe Apollo asteroids are a group of near-Earth asteroids named after 1862 Apollo, the first asteroid of this group to be discovered. They are Earth-crosser asteroids that have orbital semi-major axes greater than that of the Earth. Some can get very close to the Earth, making them a potential threat to our planet (the closer their semi-major axis is to Earth's, the less eccentricity is needed for the orbits to cross). The largest known Apollo asteroid is 1866 Sisyphus, with a diameter of about 10 km. Well-known Apollo asteroids include: Related topics External links
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