Sedna
E490424
detached object
distant Solar System object
icy body
possible inner Oort cloud object
scattered disc object candidate
trans-Neptunian object
Sedna is a distant, icy minor planet with an extremely elongated orbit that takes it far beyond the Kuiper Belt into the outermost reaches of the Solar System.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Sedna canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T4780873 — 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: Sedna Context triple: [outer Solar System, contains, Sedna]
-
A.
Eris
Eris is the Greek goddess of strife and discord, often depicted as a malevolent force sowing conflict among gods and mortals.
-
B.
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.
-
C.
Makemake
Makemake is a large, icy dwarf planet in the Kuiper Belt, known for its extremely cold surface and status as one of the most massive objects beyond Neptune.
-
D.
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.
-
E.
Haumea
Haumea is an elongated, fast-spinning dwarf planet in the Kuiper Belt notable for its rapid rotation, ring system, and two known moons.
- 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: Sedna Target entity description: Sedna is a distant, icy minor planet with an extremely elongated orbit that takes it far beyond the Kuiper Belt into the outermost reaches of the Solar System.
-
A.
Eris
Eris is the Greek goddess of strife and discord, often depicted as a malevolent force sowing conflict among gods and mortals.
-
B.
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.
-
C.
Makemake
Makemake is a large, icy dwarf planet in the Kuiper Belt, known for its extremely cold surface and status as one of the most massive objects beyond Neptune.
-
D.
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.
-
E.
Haumea
Haumea is an elongated, fast-spinning dwarf planet in the Kuiper Belt notable for its rapid rotation, ring system, and two known moons.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
detached object
ⓘ
distant Solar System object ⓘ icy body ⓘ possible inner Oort cloud object ⓘ scattered disc object candidate ⓘ trans-Neptunian object ⓘ |
| absoluteMagnitude | approximately 1.8 ⓘ |
| albedo | approximately 0.32 ⓘ |
| aphelionDistance | approximately 936 AU ⓘ |
| belongsTo | Solar System NERFINISHED ⓘ |
| designation | 90377 Sedna NERFINISHED ⓘ |
| discoveredBy |
Chadwick A. Trujillo
NERFINISHED
ⓘ
David L. Rabinowitz NERFINISHED ⓘ Michael E. Brown NERFINISHED ⓘ |
| discoveryDate | 2003-11-14 ⓘ |
| discoveryMethod | direct imaging ⓘ |
| discoveryProject | Caltech wide-field survey for distant Solar System objects ⓘ |
| discoverySite | Palomar Observatory NERFINISHED ⓘ |
| eccentricity | approximately 0.85 ⓘ |
| hasAtmosphere | no significant atmosphere detected ⓘ |
| hasMoons | no moons detected as of 2024 ⓘ |
| hasRotationPeriod | approximately 10 hours ⓘ |
| hasUnusualOrbit | yes ⓘ |
| inclination | approximately 11.9 degrees ⓘ |
| isBeyond | Kuiper Belt NERFINISHED ⓘ |
| isCandidate | dwarf planet ⓘ |
| isGravitationallyDetachedFrom | giant planets ⓘ |
| isInRegion | outer Solar System ⓘ |
| isOneOf | most distant known Solar System objects at discovery ⓘ |
| meanDiameter | approximately 995 kilometers ⓘ |
| namedAfter | Sedna (Inuit sea goddess) NERFINISHED ⓘ |
| namingCulture | Inuit mythology NERFINISHED ⓘ |
| orbitalClass | detached extreme trans-Neptunian object ⓘ |
| orbitalPeriod | approximately 11,400 years ⓘ |
| orbitExplainedBy | hypotheses including passing stars and distant massive planet ⓘ |
| orbits | Sun NERFINISHED ⓘ |
| perihelionDistance | approximately 76 AU ⓘ |
| perihelionInside | inner Oort cloud region ⓘ |
| provisionalDesignation | 2003 VB12 NERFINISHED ⓘ |
| radius | approximately 500 kilometers ⓘ |
| rotationState | likely not tidally locked ⓘ |
| semiMajorAxis | approximately 518 AU ⓘ |
| spectralType | very red, similar to some Kuiper Belt objects ⓘ |
| surfaceColor | reddish ⓘ |
| surfaceComposition |
methane ice
ⓘ
nitrogen ice (likely) ⓘ water ice ⓘ |
| surfaceTemperature | extremely low, around 20–40 K (estimated) ⓘ |
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: Sedna Description of subject: Sedna is a distant, icy minor planet with an extremely elongated orbit that takes it far beyond the Kuiper Belt into the outermost reaches of the Solar System.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.