Phoebe
E45105
Phoebe is an irregular, retrograde moon of Saturn believed to be a captured object from the outer Solar System.
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
irregular satellite
→
moon of Saturn → natural satellite → retrograde satellite → |
| albedo |
low geometric albedo
→
|
| atmosphere |
no substantial atmosphere detected
→
|
| axialTilt |
small relative to its orbit
→
|
| belongsTo |
Saturnian system
→
Solar System → |
| belongsToGroup |
Norse group of Saturnian moons
→
|
| catalogCode |
S/1899 S 1
→
|
| contributesTo |
Phoebe ring of Saturn
→
|
| density_g_per_cm3 |
approximately 1.6
→
|
| designation |
Saturn IX
→
|
| discoveredBy |
William Henry Pickering
→
|
| discoveryMethod |
telescopic observation
→
|
| discoveryYear |
1899
→
|
| eccentricity |
high orbital eccentricity
→
|
| escapeVelocity_m_per_s |
approximately 100
→
|
| firstOuterMoonOfSaturnDiscovered |
true
→
|
| flybyDate |
2004
→
|
| gravitationalInfluence |
affects dust distribution in outer Saturnian system
→
|
| gravity |
very low surface gravity
→
|
| imagedBy |
Cassini imaging system
→
|
| inclination |
high inclination relative to Saturn’s equator
→
|
| likelyOrigin |
outer Solar System
→
|
| meanDiameter_km |
approximately 213
→
|
| meanRadius_km |
approximately 106.5
→
|
| namedAfter |
Phoebe (Titaness from Greek mythology)
→
|
| orbitalClass |
irregular
→
|
| orbitalDirection |
retrograde
→
|
| orbitalPeriod_days |
approximately 550
→
|
| orbits |
Saturn
→
|
| possibleOrigin |
captured Kuiper belt object
→
captured centaur-like body → |
| ringAssociation |
source of material for Saturn’s outer Phoebe ring
→
|
| rotationPeriod_hours |
approximately 9.27
→
|
| rotationState |
not tidally locked
→
|
| scientificInterest |
clues to early outer Solar System conditions
→
|
| semiMajorAxis_km |
approximately 12,952,000
→
|
| shape |
roughly spherical but irregular
→
|
| spectralType |
C-type or D-type asteroid–like
→
|
| surfaceColor |
dark
→
|
| surfaceComposition |
water ice mixed with dark material
→
|
| surfaceFeatures |
heavily cratered
→
large impact basins → |
| visitedBy |
Cassini–Huygens spacecraft
→
|