synonymApollo Group(Asteroids discovered in 2011) generally refer to Apollo type asteroids
Apollo asteroids Is a group named after the asteroid ApolloNear Earth Asteroids, (1862) Apollo was the first asteroid found in this group.Track distance is less than 1Astronomical unit, so it can go deep intoVenus, evenMercuryWithin the track.
TheirTrack radiusSome of the asteroids that are larger than the radius of the Earth's orbit and cross the Earth's orbit are very close to the Earth, which poses a threat to our Earth (the longer the orbit radius is close to the radius of the Earth's orbit, and the smaller the orbital oblateness is, the closer it will be to the Earth).
The largest known Apollo asteroid is(1866) Xue Xifus(Sisyphus), about 10km in diameterMexicoDomesticYucatan PeninsulaAnd may causeCretaceousTertiarytimesdinosaurAndMass extinctionThe size of meteorites is similar.In addition, according to scientific analysis,2013 Chelyabinsk Asteroid Impact EventIt may also be caused by Apollo asteroids.
As of June 2011, there have been more than 4000 known Apollo asteroids, of which about 570 have permanent numbers and 60 have official names.
About 30 have been found since the 1930s.They are small in size and about 400~8000 meters in diameter.The orbit has a large inclination angle and a very flat orbit. The orbits of some asteroids are similar toEarth orbitIntersection.It is estimated that there are 400 to 1000 asteroids brighter than Grade 18.On average, there is about 1 collision every 1 billion yearsearth。It is estimated that the total number of Apollo asteroids is about 1000.Discovered in 1989Near Earth Asteroids1989FC flew over 750000 kilometers away from the Earth, becoming the closest NEA discovered.
