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 (1)
| Label | Occurrences |
|---|---|
| asteroid Apophis canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T10212011 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: asteroid Apophis Context triple: [OSIRIS-REx, postSampleReturnTarget, asteroid Apophis]
-
A.
Bennu
Bennu is an ancient Egyptian mythological bird associated with the sun, creation, and rebirth, often seen as a precursor or counterpart to the Greek phoenix.
-
B.
asteroid 1000 Piazzia
Asteroid 1000 Piazzia is a main-belt asteroid named in honor of Italian astronomer Giuseppe Piazzi, the discoverer of Ceres.
-
C.
asteroid Šteins
Asteroid Šteins is a small, diamond-shaped main-belt asteroid that was closely studied during a 2008 flyby by ESA’s Rosetta spacecraft.
-
D.
Asteroids
Asteroids is a classic 1979 arcade space shooter game by Atari in which players control a spaceship to destroy drifting asteroids and enemy saucers.
-
E.
asteroid 944 Hidalgo
Asteroid 944 Hidalgo is a large, eccentric, comet-like minor planet that orbits between the inner and outer solar system, making it one of the first known centaur objects.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: asteroid Apophis Target entity description: 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.
-
A.
Bennu
Bennu is an ancient Egyptian mythological bird associated with the sun, creation, and rebirth, often seen as a precursor or counterpart to the Greek phoenix.
-
B.
asteroid 1000 Piazzia
Asteroid 1000 Piazzia is a main-belt asteroid named in honor of Italian astronomer Giuseppe Piazzi, the discoverer of Ceres.
-
C.
asteroid Šteins
Asteroid Šteins is a small, diamond-shaped main-belt asteroid that was closely studied during a 2008 flyby by ESA’s Rosetta spacecraft.
-
D.
Asteroids
Asteroids is a classic 1979 arcade space shooter game by Atari in which players control a spaceship to destroy drifting asteroids and enemy saucers.
-
E.
asteroid 944 Hidalgo
Asteroid 944 Hidalgo is a large, eccentric, comet-like minor planet that orbits between the inner and outer solar system, making it one of the first known centaur objects.
- F. None of above. chosen
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 ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: asteroid Apophis Description of subject: 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.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
OSIRIS-REx