The Apollo asteroids are a class of with -crossing orbits. The first Apollo asteroid was discovered in 1918 by Max Wolf observing from Heidelberg, Germany. A table of large Apollo asteroids is contained in Sky & Telescope (March 1990).
The Apollo asteroids are a group of near-Earth asteroids named after 1862 Apollo, the first asteroid of this group to be discovered by Karl Wilhelm Reinmuth....
, Amors
Amor asteroid ...
2. The Apollo asteroids have perihelion distances of less than 1 A.U. (Hint)
3. The C-type asteroids are so named because of their heavily cratered surfaces. (Hint) ...
Apollo asteroids (NASA Thesaurus) Earth grazing asteroids in orbits between Mars and Jupiter, and crossing the Earth's orbit. This group contains 19 known asteroids.
Apollo asteroids Asteroids having semimajor axes a1.0 au, and perihelion distances qSee also: Asteroid, Aten asteroids, Perihelion distance, Semimajor axis Asteroid One of a number of objects ranging in size from sub-km to about 1000 km, ...
Most Potentially hazardous asteroids (PHA) are either Aten asteroids or Apollo asteroids, and therefore cross the orbit of the Earth. However, one tenth of PHAs are Amor asteroids. In order to be considered a PHA, its orbit has to get within 0.
The first of these to be discovered were the Apollo asteroids, named for (1862) Apollo, which was discovered in 1932 but was lost shortly thereafter and not rediscovered until 1978.
The first of these to be discovered were the Apollo asteroids, 1862 Apollo being detected by the German astronomer Karl Wilhelm Reinmuth in 1932 but lost shortly thereafter and not rediscovered until 1978.
Apollo asteroids have an orbit that crosses the orbit of the Earth and have a period longer than 1 year. They have a semimajor axes greater than 1 astronomical unit (au), and perihelion distances less than 1.017 au.
One kind of asteroid, called Apollo asteroids, cross the orbit of the earth as they move around the sun. Scientists think that an Apollo asteroid struck the Earth about 90 million years ago in the time of the dinosaurs.
By the late 1980s, about 75 asteroids, the Amor asteroids, were known to intersect the orbit of Mars, about 50 Apollo asteroids to intersect the orbit of the earth, and less than 10 Aten asteroids to have orbits smaller than the earth's orbit.
These are called Apollo asteroids. It is possible that collisions between such asteroids and the Earth could occur but they are only likely on a time scale of tens of thousands of years.
Of those there are 330 Aten asteroids, 1,613 Amor asteroids, and 2,181 Apollo asteroids. There are 792 NEO's which are classified as potentially hazardous asteroids.
Some of them may burn out, leaving inert residues of stony material-possibly cataloged in some cases as Apollo asteroids of spectral class C, P or D.
 See also: Apollo, Asteroids, Apollo Asteroid, Asteroid, Orbit
  
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