Phobos

E113785

Phobos is the larger and innermost of Mars’s two small, irregularly shaped moons, known for its rapid orbit and heavily cratered surface.

All labels observed (1)

Label Occurrences
Phobos canonical 18

How this entity was disambiguated

Statements (70)

Predicate Object
instanceOf astronomical object
moon of Mars
natural satellite
hasAlbedo about 0.071
hasAverageOrbitalAltitude about 6000 kilometers above Martian surface
hasAverageOrbitalDistance about 9377 kilometers from center of Mars
hasColorIndex very dark
hasDimensions 27 × 22 × 18 kilometers
hasEscapeVelocity about 11.4 m/s
hasExplorationBy Hope Mars Mission
MAVEN
Mariner 9
Mars Express
Mars Global Surveyor
Mars Reconnaissance Orbiter
Phobos 2
Viking 1
Viking 2
hasFutureMissionPlanned Martian Moons eXploration mission
surface form: Martian Moons eXploration
hasLatitudeOfStickneyCrater about 1° south
hasLikelyComposition carbonaceous material
rocky material
hasLongitudeOfStickneyCrater about 49° west
hasLowReflectivity true
hasMass about 1.0659×10^16 kilograms
hasMeanDensity about 1.876 grams per cubic centimeter
hasMeanRadius about 11.1 kilometers
hasNotableCrater Hall crater
Roche crater
Sharpless crater
Stickney crater
Todd crater
hasOrbitalDecay true
hasOrbitalEccentricity about 0.0151
hasOrbitalInclination about 1.08 degrees to Martian equator
hasOrbitalPeriod about 7.66 hours
hasOriginHypothesis accreted from Martian impact debris
captured asteroid
hasRegolithDepth up to about 100 meters
hasRotationPeriod about 7.66 hours
hasSemiMajorAxis about 9376 kilometers
hasShape irregular
hasSpectralType D-type asteroid–like
hasSurfaceArea about 1548 square kilometers
hasSurfaceFeature grooves
heavily cratered surface
regolith layer
hasSurfaceGravity about 0.0057 m/s²
hasSurfaceTemperatureRange approximately −4 °C to −112 °C
hasSynchronousRotation true
hasTidalInteractionWith Mars
hasUncertainOrigin true
hasVolume about 5660 cubic kilometers
isAssociatedWithDeity Ares
Mars
isInnermostMoonOf Mars
isLargerThan Deimos
isNamedAfter Phobos (Fear)
surface form: Phobos from Greek mythology
isOneOf two moons of Mars
isSpiralingInToward Mars
isTargetOfMission MMX
isTidallyLockedTo Mars
mayForm ring around Mars in future
nameMeaning fear or panic
orbits Mars
orbitsDirection prograde
wasDiscoveredAt United States Naval Observatory Flagstaff Station
surface form: United States Naval Observatory
wasDiscoveredBy Asaph Hall
wasDiscoveredOn 1877-08-18
willLikelyBreakUpIn tens of millions of years

How these facts were elicited

Referenced by (18)

Full triples — surface form annotated when it differs from this entity's canonical label.

Mars hasNaturalSatellite Phobos
Ares child Phobos
Ares associatedWith Phobos
Doom franchise (via id Software) setting Phobos
subject surface form: Doom franchise
Roman god Mars child Phobos
subject surface form: Mars
Deimos isSmallerThan Phobos
Deimos (Terror) sibling Phobos
subject surface form: Deimos
Deimos (Terror) relative Phobos
subject surface form: Deimos
Deimos (Terror) associatedWith Phobos
subject surface form: Deimos
Adrestia sibling Phobos
The Ultimate Doom setting Phobos
Doom: Annihilation setIn Phobos