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.
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) ⓘ |
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.