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Comparison Chart
Comparison: Deimos vs. Mars

This chart shows the differences between Deimos and Mars. To change the planets/moons being compared, change one or more of the form fields at the bottom and click Refresh.

Discovered By
A. Hall
Known by the Ancients
Date of Discovery
Average Orbit Distance
23,458 km
227,943,824 km
Perihelion/Perigee (closest)
23,453 km
206,655,215 km
Aphelion/Apogee (farthest)
23,463 km
249,232,432 km
Equatorial Radius
6.2 km
3,389.5 km
Equatorial Circumference
39.0 km
21,296.9 km
998 km3
163,115,609,799 km3
1,476,188,406,600,740 kg
641,693,000,000,000,000,000,000 kg
1.471 g/cm3
3.934 g/cm3
Surface Area
483.05 km2
144,371,391 km2
Equatorial Surface Gravity
0.003 m/s2
3.71 m/s2
Escape Velocity
20 km/h
18,108 km/h
Rotation Period (Length of Day)
1.2624 Earth days
1.026 sidereal days
Orbit Period (Length of Year)
0.003456263 sidereal years
1.8808476 sidereal years
Mean Orbit Velocity
4,864.8 km/h
86,677 km/h
Orbit Eccentricity
Orbit Inclination to Ecliptic
1.788 degrees
1.85 degrees
Orbit Circumference
147,390.96 km
1,429,085,052 km


New planets/moons to compare:

System of measurement:

Compare All Eight Planets

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Last Updated: 30 Aug 2014