Hyperion

E28501

irregular satellite moon of Saturn natural satellite

Hyperion is one of Saturn’s larger, irregularly shaped moons, known for its chaotic rotation and sponge-like, heavily cratered surface.

Predicate	Object
instanceOf	irregular satellite → moon of Saturn → natural satellite →
albedo	low →
axialTilt	chaotic →
belongsToPlanetarySystem	Saturnian system →
catalogDesignation	Saturn VII →
celestialBodyType	irregularly shaped moon →
closestApproachByCassini_km	~500 →
color	reddish-brown →
dimension_km	360 × 280 × 225 →
discoveredBy	George Phillips Bond → William Cranch Bond → William Lassell →
discoveryDate	1848-09-16 →
discoverySite	United States →
escapeVelocity_m_per_s	24 →
hasChaoticRotation	true →
hasHeavilyCrateredSurface	true →
hasIrregularShape	true →
mass_kg	5.6e18 →
meanDensity_g_per_cm3	0.54 →
meanPorosity_percent	~40 →
meanRadius_km	135 →
mythologicalAssociation	Titan Hyperion →
namedAfter	Hyperion from Greek mythology →
notableProperty	chaotic tumbling motion → low density compared to solid ice → spongy, porous structure →
orbitalEccentricity	0.1042 →
orbitalInclination_deg	0.43 →
orbitalPeriod_days	21.276 →
orbitalResonanceRatio	4:3 with Titan →
orbits	Saturn →
parentPlanet	Saturn →
porosity	very high →
resonanceWith	Titan →
rotationState	chaotic rotation →
satelliteOf	Saturn →
semiMajorAxis_km	1481000 →
shape	highly irregular →
surfaceAppearance	sponge-like →
surfaceComposition	dark organic-rich material → water ice →
surfaceFeature	heavily cratered terrain →
surfaceGravity_m_per_s2	0.017 →
synchronousRotation	false →
visitedBy	Cassini–Huygens → Voyager 2 →

Subject (surface form when different)	Predicate
Brain Droppings → Shopgirl →	publisher
Helios ("Hyperionides") →	epithet
Saturn →	hasMajorMoon
Iapetus →	sibling
Cassini–Huygens →	studiedMoon