28978 Ixion
E450959
Kuiper Belt object
cubewano-plutino transition object
minor planet
plutino
possible dwarf planet
resonant trans-Neptunian object
trans-Neptunian object
28978 Ixion is a large trans-Neptunian object in the Kuiper Belt classified as a plutino, known for its similar orbital resonance with Neptune as Pluto.
All labels observed (1)
| Label | Occurrences |
|---|---|
| 28978 Ixion canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4531538 — 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: 28978 Ixion Context triple: [Chad Trujillo, coDiscovererOf, 28978 Ixion]
-
A.
20000 Varuna
20000 Varuna is a large trans-Neptunian object in the Kuiper Belt, notable for its rapid rotation, elongated shape, and status as one of the earliest discovered significant bodies beyond Neptune.
-
B.
212 Olympia
212 Olympia is a professional bodybuilding division at the Mr. Olympia competition for athletes weighing 212 pounds or less.
-
C.
Adrestia
Adrestia is a lesser-known Greek goddess associated with revolt, retribution, and the balance between war and peace.
-
D.
1998 KY26
1998 KY26 is a tiny, rapidly rotating near-Earth asteroid selected as the extended mission target for Japan’s Hayabusa2 spacecraft.
-
E.
Iota
Iota is the ninth letter of the Greek alphabet, historically representing a short "i" sound and giving rise to the Latin letter I.
- 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: 28978 Ixion Target entity description: 28978 Ixion is a large trans-Neptunian object in the Kuiper Belt classified as a plutino, known for its similar orbital resonance with Neptune as Pluto.
-
A.
20000 Varuna
20000 Varuna is a large trans-Neptunian object in the Kuiper Belt, notable for its rapid rotation, elongated shape, and status as one of the earliest discovered significant bodies beyond Neptune.
-
B.
212 Olympia
212 Olympia is a professional bodybuilding division at the Mr. Olympia competition for athletes weighing 212 pounds or less.
-
C.
Adrestia
Adrestia is a lesser-known Greek goddess associated with revolt, retribution, and the balance between war and peace.
-
D.
1998 KY26
1998 KY26 is a tiny, rapidly rotating near-Earth asteroid selected as the extended mission target for Japan’s Hayabusa2 spacecraft.
-
E.
Iota
Iota is the ninth letter of the Greek alphabet, historically representing a short "i" sound and giving rise to the Latin letter I.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
Kuiper Belt object
ⓘ
cubewano-plutino transition object ⓘ minor planet ⓘ plutino ⓘ possible dwarf planet ⓘ resonant trans-Neptunian object ⓘ trans-Neptunian object ⓘ |
| absoluteMagnitude | approximately 3.2 ⓘ |
| albedo | approximately 0.15 ⓘ |
| aphelionDistance | approximately 49 AU ⓘ |
| argumentOfPerihelion | approximately 296 degrees ⓘ |
| belongsToDynamicalClass | plutinos ⓘ |
| belongsToPopulation | classical and resonant Kuiper belt population boundary ⓘ |
| belongsToSolarSystem | outer Solar System ⓘ |
| classificationStatus | not officially classified as dwarf planet by IAU ⓘ |
| discoveredAt | Cerro Tololo Inter-American Observatory ⓘ |
| discoveredBy |
Deep Ecliptic Survey
ⓘ
Marc W. Buie ⓘ Robert L. Millis ⓘ |
| discoveredOn | 2001-05-22 ⓘ |
| discoverySurvey | Deep Ecliptic Survey ⓘ |
| estimatedDiameter |
approximately 650 km
ⓘ
between 600 km and 800 km ⓘ |
| hasColorIndexB-R | approximately 1.6 ⓘ |
| hasColorIndexV-R | approximately 0.6 ⓘ |
| hasMinorPlanetNumber | 28978 ⓘ |
| hasNoKnownMoons | true ⓘ |
| hasObservationArc | greater than 20 years ⓘ |
| hasProvisionalDesignation | 2001 KX76 ⓘ |
| isOneOfLargest | plutinos ⓘ |
| locatedInEpoch | J2000 ecliptic ⓘ |
| longitudeOfAscendingNode | approximately 71 degrees ⓘ |
| meanAnomaly | approximately 310 degrees (epoch-dependent) ⓘ |
| meanDistanceFromSun | approximately 39.6 AU ⓘ |
| namedAfter |
Ixion
ⓘ
figure from Greek mythology ⓘ |
| orbitalEccentricity | approximately 0.24 ⓘ |
| orbitalInclination | approximately 19.7 degrees ⓘ |
| orbitalPeriod | approximately 248 years ⓘ |
| orbitalResonanceType | 2:3 resonance ⓘ |
| orbitalResonanceWith | Neptune ⓘ |
| orbitsIn |
Kuiper belt
ⓘ
linked to:
Kuiper Belt
|
| perihelionDistance | approximately 30 AU ⓘ |
| rotationPeriod | approximately 12.4 hours ⓘ |
| semiMajorAxis | approximately 39.6 AU ⓘ |
| similarOrbitalResonanceTo | Pluto ⓘ |
| spectralType | moderately red TNO ⓘ |
| surfaceComposition | likely mixture of water ice and complex organics ⓘ |
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: 28978 Ixion Description of subject: 28978 Ixion is a large trans-Neptunian object in the Kuiper Belt classified as a plutino, known for its similar orbital resonance with Neptune as Pluto.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.