Satellites of Mars

(Orbital, physical and photometric data)

I   Phobos

0.32

9.38

1.65´10^-8

13.4´11.2´9.2

11.4

II  Deimos

1.26

23.46

3.71´10^-9

7.5´6.1´5.2

12.5

¹ Half the length of the major axis of the ellipse; a standard element used to describe an elliptical orbit.

² This is the mean opposition magnitude of the satellite.