Phobos Celestial calendar

Satellites of Mars

(Orbital, physical and photometric data)


Name

Orbital Period

Semimajor Axis1

Mass

Radius

Magnitude2

d

´103 km

1/Planet

km

m

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

 

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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.