90377 Sedna
E450958
Solar System object
detached object
minor planet
possible dwarf planet
scattered disc object candidate
sednoid
trans-Neptunian object
90377 Sedna is a distant, large trans-Neptunian object in the outer reaches of the Solar System, notable for its highly elongated orbit and status as one of the most remote known bodies orbiting the Sun.
All labels observed (1)
| Label | Occurrences |
|---|---|
| 90377 Sedna canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T4531535 — 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: 90377 Sedna Context triple: [Chad Trujillo, coDiscovererOf, 90377 Sedna]
-
A.
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.
-
B.
90482 Orcus
90482 Orcus is a large trans-Neptunian object and plutino in the Kuiper Belt, often considered a dwarf-planet candidate and notable for its moon Vanth.
-
C.
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.
-
D.
Eris
Eris is the Greek goddess of strife and discord, often depicted as a malevolent force sowing conflict among gods and mortals.
-
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: 90377 Sedna Target entity description: 90377 Sedna is a distant, large trans-Neptunian object in the outer reaches of the Solar System, notable for its highly elongated orbit and status as one of the most remote known bodies orbiting the Sun.
-
A.
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.
-
B.
90482 Orcus
90482 Orcus is a large trans-Neptunian object and plutino in the Kuiper Belt, often considered a dwarf-planet candidate and notable for its moon Vanth.
-
C.
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.
-
D.
Eris
Eris is the Greek goddess of strife and discord, often depicted as a malevolent force sowing conflict among gods and mortals.
-
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 (53)
| Predicate | Object |
|---|---|
| instanceOf |
Solar System object
ⓘ
detached object ⓘ minor planet ⓘ possible dwarf planet ⓘ scattered disc object candidate ⓘ sednoid ⓘ trans-Neptunian object ⓘ |
| absoluteMagnitude | about 1.6 ⓘ |
| albedo | about 0.32 ⓘ |
| aphelionDistance | about 937 AU ⓘ |
| aphelionRegion | inner Oort cloud candidate region ⓘ |
| argumentOfPerihelion | about 311 degrees ⓘ |
| belongsTo | Solar System NERFINISHED ⓘ |
| discoveredByProgram | Caltech wide-field survey for distant Solar System objects NERFINISHED ⓘ |
| discoverer |
Chad Trujillo
NERFINISHED
ⓘ
David L. Rabinowitz NERFINISHED ⓘ Michael E. Brown NERFINISHED ⓘ |
| discoveryDate | 2003-11-14 ⓘ |
| discoveryMethod | CCD imaging survey ⓘ |
| discoverySite | Palomar Observatory NERFINISHED ⓘ |
| distanceFromSunAtDiscovery | about 90 AU ⓘ |
| eccentricity | about 0.85 ⓘ |
| estimatedDiameter |
about 1000 km
ⓘ
between 900 km and 1100 km ⓘ |
| hasNo | known moons ⓘ |
| inclination | about 11.9 degrees ⓘ |
| influencedTheorizingAbout |
Solar System formation
ⓘ
presence of distant massive perturbers ⓘ stellar encounters in Sun's birth cluster ⓘ |
| isBeyond | Neptune NERFINISHED ⓘ |
| isOneOf | most distant known Solar System objects ⓘ |
| longitudeOfAscendingNode | about 144 degrees ⓘ |
| meanAnomaly | about 358 degrees (at epoch near discovery) ⓘ |
| mpcDesignation | 90377 Sedna NERFINISHED ⓘ |
| namedAfter |
Inuit sea goddess Sedna
NERFINISHED
ⓘ
Sedna NERFINISHED ⓘ |
| notableFor |
extreme distance from the Sun
ⓘ
highly elongated orbit ⓘ possible link to inner Oort cloud ⓘ |
| orbitalCategory | detached extreme trans-Neptunian object ⓘ |
| orbitalPeriod | approximately 11000 years ⓘ |
| orbits | Sun NERFINISHED ⓘ |
| perihelionDistance | about 76 AU ⓘ |
| perihelionLocation | far beyond Kuiper belt ⓘ |
| provisionalDesignation | 2003 VB12 ⓘ |
| rotationPeriod | about 10 hours ⓘ |
| semiMajorAxis | about 506 AU ⓘ |
| spectralType | very red TNO spectrum ⓘ |
| surfaceColor | very red ⓘ |
| surfaceComposition |
likely methane ice
ⓘ
likely nitrogen ice ⓘ likely water ice ⓘ organic tholins ⓘ |
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: 90377 Sedna Description of subject: 90377 Sedna is a distant, large trans-Neptunian object in the outer reaches of the Solar System, notable for its highly elongated orbit and status as one of the most remote known bodies orbiting the Sun.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.