asteroid Apophis

E850190

Asteroid Apophis is a near-Earth asteroid famous for its close approaches to our planet and for being closely studied as a potential impact hazard.

All labels observed (2)

Label Occurrences
asteroid Apophis canonical 2
99942 Apophis 1

How this entity was disambiguated

Statements (51)

Predicate Object
instanceOf Apollo-group asteroid ⓘ
asteroid ⓘ
near-Earth asteroid ⓘ
absoluteMagnitude 19.7 ⓘ
albedo about 0.23 ⓘ
aphelionDistance 1.098 astronomical units ⓘ
apparentMagnitudeAt2029CloseApproach about 3.0 ⓘ
argumentOfPerihelion 126.4 degrees ⓘ
ascendingNodeLongitude 204.4 degrees ⓘ
belongsToCategory Earth-crossing asteroid ⓘ
potential impact hazard (historically) ⓘ
belongsToDynamicalGroup Apollo asteroids ⓘ
closeApproachToEarthDate 2029-04-13 ⓘ
closestApproachDistanceIn2029 about 0.00021 astronomical units from Earth’s center ⓘ
about 31,600 kilometers from Earth’s surface ⓘ
diameter about 370 meters ⓘ
discoveredBy David J. Tholen ⓘ
Fabrizio Bernardi ⓘ
Roy A. Tucker ⓘ
discoveryDate 2004-06-19 ⓘ
discoverySite Kitt Peak National Observatory ⓘ
eccentricity 0.191 ⓘ
impactProbabilityFor2029 0 ⓘ
impactProbabilityFor2036 0 ⓘ
impactProbabilityFor2068 0 ⓘ
inclination 3.33 degrees ⓘ
initialImpactProbabilityFor2029 about 2.7 percent (now ruled out) ⓘ
mass about 2.7×10^10 kilograms ⓘ
meanAnomaly 339.5 degrees ⓘ
meanDiameter approximately 0.37 kilometers ⓘ
minimumOrbitIntersectionDistanceWithEarth 0.000254 astronomical units ⓘ
mpcDesignation 99942 Apophis ⓘ
linked to: 2004 MN4
namedAfter Apep ⓘ
Apophis ⓘ
orbitalPeriod 323.6 days ⓘ
orbits Sun ⓘ
OSIRIS-APEXArrival shortly after 2029 Earth flyby ⓘ
passesWithinGeostationaryOrbitIn2029 true ⓘ
perihelionDistance 0.746 astronomical units ⓘ
provisionalDesignation 2004 MN4 ⓘ
removedFromSentryRiskTable true ⓘ
removedFromSentryRiskTableDate 2021-03-26 ⓘ
riskScalePreviously 1.10 on Palermo Technical Scale (now negative) ⓘ
4 on Torino Scale (now 0) ⓘ
rotationPeriod about 30.6 hours ⓘ
semiMajorAxis 0.922 astronomical units ⓘ
spectralType Sq-type ⓘ
studiedBy Arecibo Observatory radar ⓘ
linked to: Arecibo Observatory

Goldstone Solar System Radar ⓘ
linked to: Deep Space Network
targetOfMission OSIRIS-APEX ⓘ
willBeVisibleToNakedEyeIn2029 true ⓘ

How these facts were elicited

Referenced by (3)

Full triples — surface form annotated when it differs from this entity's canonical label.

OSIRIS-REx → postSampleReturnTarget → asteroid Apophis ⓘ
OSIRIS-REx → relatedAsteroid → 99942 Apophis ⓘ
linked to: asteroid Apophis