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Deimos (moon)DeimosAn image of Deimos taken by the Mars Reconnaissance Orbiter.

Discovery

Discovered byAsaph HallDiscovery date1877, August 12Designations

AdjectiveDeimosianOrbital characteristics[1]

Semi-major axis23,460 kilometres (14,580 mi)Eccentricity0.000 2Orbital period1.262 44 d (30.30 hours)Average orbital speed1.35 km/sInclination0.93° (to Mars' equator)

1.793° (to the local Laplace plane)

27.58° (to the ecliptic)Satellite ofMarsPhysical characteristics

Dimensions15 × 12.2 × 10.4 km[2]Mean radius6.2 kilometres (3.9 mi) [3]Mass1.48 × 1015 kg[4]

(0.25 nEarths)Mean density1.471 g/cm³[3]Equatorial surface gravity0.003 9 m/s² (3.9 mm/s²)

0.000 40 g (400 µg)Escape velocity5.6 m/s (20 km/h)[4]Rotation periodsynchronousAlbedo0.068[3]Temperature≈233 KApparent magnitude12.4 [3][5]

Deimos (pronounced /ˈdaɪməs/ DYE-məs; also /ˈdiːməs/ DEE-məs, as in Greek Δείμος), is the smaller and outer of Mars' two moons (the other being Phobos). It is named after Deimos, a figure representing dread in Greek Mythology.[6] Its systematic designation is Mars II.[6]

Please see the related link below for images of the Greek god 'Deimos'.
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14y ago

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