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.

	Deimos	Mars
Discovered By	A. Hall	Known by the Ancients
Date of Discovery	1877	Unknown
Average Orbit Distance	23,459 km	227,936,640 km
Equatorial Radius	7.5 x 6.1 x 5.2 km	3,397 km
Mass	2,380,000,000,000,000 kg	641,850,000,000,000,000,000,000 kg
Rotation Period (Length of Day)	1.026 Earth days	1.026 sidereal days
Orbit Eccentricity	0.0005	.0934
Orbital Inclination to Ecliptic	0.9 - 2.7 degrees	1.8 degrees

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