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.
Observed surface forms (3)
| Surface form | Occurrences |
|---|---|
| Orcus | 0 |
| Vanth | 0 |
| Orcus–Vanth system | 0 |
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 NERFINISHED ⓘ |
| belongsToDynamicalClass | plutino ⓘ |
| celestialBodyType | icy body ⓘ |
| density | approximately 1.5 g/cm³ ⓘ |
| discoveredBy |
Chad Trujillo
NERFINISHED
ⓘ
David Rabinowitz NERFINISHED ⓘ Michael E. Brown NERFINISHED ⓘ Michael E. Brown NERFINISHED ⓘ |
| discoveryDate |
2004-02-17
ⓘ
2005-11-13 ⓘ |
| discoverySite | Palomar Observatory NERFINISHED ⓘ |
| equatorialRadius | approximately 455 kilometers ⓘ |
| hasApproximateSatelliteMassRatio | Vanth about 3–4 times less massive than Orcus NERFINISHED ⓘ |
| hasProvisionalDesignation | 2004 DW NERFINISHED ⓘ |
| hasSatellite | Vanth NERFINISHED ⓘ |
| hasSystem | Orcus–Vanth system NERFINISHED ⓘ |
| locatedIn |
Kuiper Belt
NERFINISHED
ⓘ
outer Solar System ⓘ |
| mass | approximately 6.3×10^20 kilograms ⓘ |
| meanDiameter |
approximately 440 kilometers
ⓘ
approximately 910 kilometers ⓘ |
| minorPlanetDesignation | (90482) Orcus NERFINISHED ⓘ |
| namedAfter | Orcus (Roman god of the underworld) NERFINISHED ⓘ |
| oftenComparedTo | Pluto NERFINISHED ⓘ |
| 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 NERFINISHED ⓘ |
| orbits |
Orcus
NERFINISHED
ⓘ
Sun NERFINISHED ⓘ |
| 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 ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.