dwarf planet Orcus
E1026164
Kuiper Belt object
binary trans-Neptunian system
dwarf planet
natural satellite
plutino
trans-Neptunian object
Dwarf planet Orcus is a large Kuiper Belt object beyond Neptune, often compared to Pluto for its similar orbit and characteristics, and is accompanied by its moon Vanth.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Vanth about 3–4 times less massive than Orcus | 1 |
| dwarf planet Orcus canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T13179970 — 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: dwarf planet Orcus Context triple: [Vanth, isMoonOf, dwarf planet Orcus]
-
A.
Quaoar
Quaoar is a large, distant trans-Neptunian object in the Kuiper Belt, notable for its nearly circular orbit and for having a small moon named Weywot.
-
B.
Pluto
Pluto is a distant, icy dwarf planet in the Kuiper Belt known for its eccentric orbit and former status as the ninth planet of the Solar System.
-
C.
Pluto
Pluto is Mickey Mouse’s loyal pet dog, a classic Disney cartoon character known for his playful, expressive, and mostly non-speaking role in animated films and shorts.
-
D.
Pluto
Pluto is the Roman god of the underworld and wealth, often identified with the Greek god Hades.
-
E.
Eris
Eris is a distant, icy dwarf planet in the outer reaches of the Solar System, notable for its size comparable to Pluto and its role in prompting the redefinition of planetary status.
- 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: dwarf planet Orcus Target entity description: Dwarf planet Orcus is a large Kuiper Belt object beyond Neptune, often compared to Pluto for its similar orbit and characteristics, and is accompanied by its moon Vanth.
-
A.
Quaoar
Quaoar is a large, distant trans-Neptunian object in the Kuiper Belt, notable for its nearly circular orbit and for having a small moon named Weywot.
-
B.
Pluto
Pluto is Mickey Mouse’s loyal pet dog, a classic Disney cartoon character known for his playful, expressive, and mostly non-speaking role in animated films and shorts.
-
C.
Pluto
Pluto is the Roman god of the underworld and wealth, often identified with the Greek god Hades.
-
D.
Pluto
Pluto is a distant, icy dwarf planet in the Kuiper Belt known for its eccentric orbit and former status as the ninth planet of the Solar System.
-
E.
Eris
Eris is a distant, icy dwarf planet in the outer reaches of the Solar System, notable for its size comparable to Pluto and its role in prompting the redefinition of planetary status.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
Kuiper Belt object
ⓘ
binary trans-Neptunian system ⓘ dwarf planet ⓘ natural satellite ⓘ plutino ⓘ trans-Neptunian object ⓘ |
| absoluteMagnitude | approximately 2.3 ⓘ |
| albedo | approximately 0.23 ⓘ |
| aphelionDistance | approximately 48.1 astronomical units ⓘ |
| belongsTo | Solar System ⓘ |
| belongsToDynamicalClass | plutino ⓘ |
| celestialBodyType | icy body ⓘ |
| density | approximately 1.5 g/cm³ ⓘ |
| discoveredBy |
Chad Trujillo
ⓘ
David Rabinowitz ⓘ
linked to:
David L. Rabinowitz
Michael E. Brown ⓘ Michael E. Brown ⓘ |
| discoveryDate |
2004-02-17
ⓘ
2005-11-13 ⓘ |
| discoverySite | Palomar Observatory ⓘ |
| equatorialRadius | approximately 455 kilometers ⓘ |
| hasApproximateSatelliteMassRatio |
Vanth about 3–4 times less massive than Orcus
ⓘ
linked to:
dwarf planet Orcus
|
| hasProvisionalDesignation | 2004 DW ⓘ |
| hasSatellite | Vanth ⓘ |
| hasSystem | Orcus–Vanth system ⓘ |
| locatedIn |
Kuiper Belt
ⓘ
outer Solar System ⓘ |
| mass | approximately 6.3×10^20 kilograms ⓘ |
| meanDiameter |
approximately 440 kilometers
ⓘ
approximately 910 kilometers ⓘ |
| minorPlanetDesignation |
(90482) Orcus
ⓘ
linked to:
90482 Orcus
|
| namedAfter | Orcus (Roman god of the underworld) ⓘ |
| oftenComparedTo | Pluto ⓘ |
| orbitalEccentricity | approximately 0.22 ⓘ |
| orbitalInclination |
approximately 20.6 degrees
ⓘ
nearly face-on to Earth ⓘ |
| orbitalPeriod |
approximately 247 Earth years
ⓘ
approximately 9.54 days ⓘ |
| orbitalResonanceRatio | 2:3 ⓘ |
| orbitalResonanceWith | Neptune ⓘ |
| orbits |
Orcus
ⓘ
Sun ⓘ |
| perihelionDistance | approximately 30.3 astronomical units ⓘ |
| recognizedAs | possible dwarf planet by IAU criteria ⓘ |
| rotationPeriod | approximately 10.5 hours ⓘ |
| semiMajorAxis | approximately 39.2 astronomical units ⓘ |
| spectralFeature | water-ice absorption bands ⓘ |
| surfaceComposition |
carbonaceous material
ⓘ
water ice ⓘ |
| surfaceFeature | relatively dark surface ⓘ |
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: dwarf planet Orcus Description of subject: Dwarf planet Orcus is a large Kuiper Belt object beyond Neptune, often compared to Pluto for its similar orbit and characteristics, and is accompanied by its moon Vanth.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject linked to:
dwarf planet Orcus
linked to: dwarf planet Orcus