- Apollo asteroid
The Apollo asteroids are a group of
near-Earth asteroids named after 1862 Apollo, the first asteroidof this group to be discovered by Karl Wilhelm Reinmuth. They are Earth-crosser asteroids that have orbital semi-major axes greater than that of the Earth(> 1 AU) and a periheliondistance (q) < 1.017 AU. 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:
Apollo asteroid records
* [http://cfa-www.harvard.edu/iau/lists/Apollos.html List of Apollo minor planets]
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