Mean diameter12,400 m
4.6 tenthsMalta lengths
185,075Tennis ball diameters
309 millionthsEarth circumferences
Roughly 12.4 km, irregular shape
Photo from Wikimedia Commons
Deimos
The smaller and more distant of Mars's two potato-shaped moons/Moons
Deimos is the smaller of Mars's two moons and is essentially a lumpy space potato about 12 km across. It orbits Mars every 30 hours, which is actually slower than Mars rotates, so from the Martian surface it rises in the east and sets in the west like a tiny, confused star. Scientists believe it is a captured asteroid, which is the celestial equivalent of adopting a stray.
Measurements
Mass1.5 quadrillion kg
1.6 quintillionM&Ms
4 millionEmpire State Building masses
1.5 sextillionGrains of sand
Orbital radius23.5 million m
321 millionLipstick tubes
11 millionChristmas trees
130 millionBananas
23,460 km from Mars
Orbital period109,075 s
43.3TV episodes
49 millionthsQueen Elizabeth II reigns
About 30.3 hours
Orbital speed1,351 m/s
50Thrown footballs
2,702Escalators
Surface temperature233 K
1.7 tenthsCandle flames
6.9 tenthsSun-baked car interiors
7.5 tenthsCat body temperatures
Average, about -40 C