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- Aten_asteroid abstract "The Aten asteroids are a group of near-Earth asteroids, named after the first of the group to be discovered (2062 Aten, discovered January 7, 1976, by Eleanor F. Helin). They are defined by having a semi-major axes of less than one astronomical unit (the distance from the Earth to the Sun). Atens also have aphelion (furthest distance from the Sun) greater than 0.983 AU. Because asteroids' orbits can be highly eccentric, an Aten orbit need not be entirely contained within Earth's orbit; in fact, nearly all known Aten asteroids have their aphelion greater than one AU even though their semi-major axis is less than one AU. Observation of objects inferior to the Earth's orbit is difficult and may be the cause of some sampling bias in the apparent preponderance of eccentric Atens. Aten asteroids account for only about 6% of the known near-Earth asteroid population. Many more Apollo-class asteroids are known than Aten-class asteroids because of the sampling bias.Asteroids that have their aphelion entirely within the Earth's orbit are known as Apohele asteroids, or alternatively as Inner Earth Objects (IEOs) or Atira asteroids. Apoheles are traditionally listed as a subclass of Atens, but are a separate class. As of February 2014, there are only 13 known Apoheles, and 815 known Aten asteroids.The shortest semi-major axis for any known Aten asteroid is (325102) 2008 EY5 at 0.626 AU. The Aten asteroid with the smallest known perihelion is also the one with the highest known eccentricity: (137924) 2000 BD19 has an orbit with an eccentricity of 0.895, which takes it from a perihelion of 0.092 AU, well within Mercury's orbit, to an aphelion of 1.66 AU.For a brief time near the end of 2004, the asteroid 99942 Apophis (then known only by its provisional designation 2004 MN4) appeared to pose a threat of causing an Earth impact event in 2029, but earlier observations were found that eliminated that possibility. A very small possibility remained for 2036, but this was also eliminated.".
- Aten_asteroid thumbnail Minor_Planets_-_Aten.svg?width=300.
- Aten_asteroid wikiPageID "442463".
- Aten_asteroid wikiPageRevisionID "599447735".
- Aten_asteroid hasPhotoCollection Aten_asteroid.
- Aten_asteroid subject Category:Aten_asteroids.
- Aten_asteroid type Asteroid109208702.
- Aten_asteroid type AtenAsteroids.
- Aten_asteroid type CelestialBody109239740.
- Aten_asteroid type MinorPlanet109355623.
- Aten_asteroid type NaturalObject100019128.
- Aten_asteroid type Object100002684.
- Aten_asteroid type PhysicalEntity100001930.
- Aten_asteroid type Whole100003553.
- Aten_asteroid comment "The Aten asteroids are a group of near-Earth asteroids, named after the first of the group to be discovered (2062 Aten, discovered January 7, 1976, by Eleanor F. Helin). They are defined by having a semi-major axes of less than one astronomical unit (the distance from the Earth to the Sun). Atens also have aphelion (furthest distance from the Sun) greater than 0.983 AU.".
- Aten_asteroid label "Asteroide Aten".
- Aten_asteroid label "Asteroides Atón".
- Aten_asteroid label "Astéroïde Aten".
- Aten_asteroid label "Aten asteroid".
- Aten_asteroid label "Aten-planetoïden".
- Aten_asteroid label "Grupa Atena".
- Aten_asteroid label "Атоны".
- Aten_asteroid label "アテン群".
- Aten_asteroid label "阿登型小行星".
- Aten_asteroid sameAs Atenova_skupina.
- Aten_asteroid sameAs Αστεροειδείς_Ατών.
- Aten_asteroid sameAs Asteroides_Atón.
- Aten_asteroid sameAs Aton_asteroideak.
- Aten_asteroid sameAs Astéroïde_Aten.
- Aten_asteroid sameAs Asteroid_Aten.
- Aten_asteroid sameAs Asteroide_Aten.
- Aten_asteroid sameAs アテン群.
- Aten_asteroid sameAs Aten-planetoïden.
- Aten_asteroid sameAs Grupa_Atena.
- Aten_asteroid sameAs Asteroide_Aton.
- Aten_asteroid sameAs m.0290ms.
- Aten_asteroid sameAs Q1048390.
- Aten_asteroid sameAs Q1048390.
- Aten_asteroid sameAs Aten_asteroid.
- Aten_asteroid wasDerivedFrom Aten_asteroid?oldid=599447735.
- Aten_asteroid depiction Minor_Planets_-_Aten.svg.
- Aten_asteroid isPrimaryTopicOf Aten_asteroid.