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Orbit data - Object data - Mythology - Links Go to the bottom of the page
Photo of the satellite Phobos of the planet Mars
Phobos   Mars I

Hide this area Orbit data
Mean distance from the planet Mars 9.378 km
Orbital period around the planet Mars (sideric) 7,65 h
Mean orbital velocity 2,14 km/s
Orbital inclination 1,082 °
Eccentricity of the orbit around the planet Mars 0,0151
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Discovered by Asaph Hall 1877
Mass 1,06 × 1016 kg
Equatorial radius 13,4 × 11,2 × 9,2 km
Mean density 1,9 g/cm³
Escape velocity 0,0103 km/s
Surface force of gravity 0,3 m/s²
Rotational period (synchronous) 7,65 h
Albedo 0,07
Apparent magnitude + 11,3 mvis
Hide this area Mythology

Phobos ("fright") is the greek personification of fear and terror. He is usually considered to be a son of Ares, and accompanying him in battle, instilling fear in all he saw. His brother of Deimos.

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File icon NASA (Viking Orbiter) - High Resolution Mosaic of Phobos
© Calvin J. Hamilton ("Views of the Solar System")
File icon NASA (Viking Orbiter) - Stickney Crater on Phobos
Link to the page "Views of the Solar System"
File icon Welcome to the Planets
Online version of the "Planetary Data System Educational CD-ROM"
File icon A Multimedia Tour of the Solar System - The Nine Planets
© William A. Arnett
© 2018 by Bernd Onasch - Imprint Go to the top of the page