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.
Observed surface forms (1)
| Surface form | Occurrences |
|---|---|
| 99942 Apophis | 0 |
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 NERFINISHED ⓘ |
| 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
NERFINISHED
ⓘ
Fabrizio Bernardi NERFINISHED ⓘ Roy A. Tucker NERFINISHED ⓘ |
| discoveryDate | 2004-06-19 ⓘ |
| discoverySite | Kitt Peak National Observatory NERFINISHED ⓘ |
| 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 NERFINISHED ⓘ |
| namedAfter |
Apep
NERFINISHED
ⓘ
Apophis NERFINISHED ⓘ |
| orbitalPeriod | 323.6 days ⓘ |
| orbits | Sun NERFINISHED ⓘ |
| OSIRIS-APEXArrival | shortly after 2029 Earth flyby ⓘ |
| passesWithinGeostationaryOrbitIn2029 | true ⓘ |
| perihelionDistance | 0.746 astronomical units ⓘ |
| provisionalDesignation | 2004 MN4 NERFINISHED ⓘ |
| 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
NERFINISHED
ⓘ
Goldstone Solar System Radar NERFINISHED ⓘ |
| targetOfMission | OSIRIS-APEX NERFINISHED ⓘ |
| willBeVisibleToNakedEyeIn2029 | true ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
OSIRIS-REx