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Encyclopedia > Characteristics > Saturn II


Characteristics Values
Semi-major axis in
astronomical units (au)
Semi-major axis in km 1 429 394 069
Eccentricity of the orbit 0.05555
Inclination of the orbit on the ecliptic 2°.4889
Inclination of the equator on the ecliptic 26°.73
Sidereal period of revolution  29 years et 166.98 days 
Rotation period 10.66 hours
Orbital velocity 10 km/s
Apparent equatorial diameter
at the smallest distance from the Earth (maximum value) 
Equatorial diameter (Earth=1)  9.4335
Equatorial diameter  120 536 km
Visual magnitude at the opposition 0,67
Flattening  1/10.2
Volume (Earth=1)  757 
Mass (Sun=1)  1/3498.77
Mass (Earth=1)  95.16
Mass Saturn+satellites (Sun=1)  1/3497.90
Mass Saturn+satellites (Saturn=1)  1.0002
Density (Earth=1)  0.125
Density (water=1)  0.69
Gravity at the surface (Earth=1) 1.07
Escape velocity 35 490 m/s
Reflectivity (geometric albedo) 0.47
The highest peak 8 000 m
Deepest pit 205 000 m
Temperature of the clouds -125°C
Atmospheric pressure
at cloud level (Earth=1)
Atmosphere  hydrogen 97%,
helium 3%,
traces of methane and other gases
Credit : NASA

Above, Saturn as seen by Voyager from a distance of 13 millions of km :note the shadow of the ring on the disk and two small satellites Tethys and Dione.  

Click here for an animation
showing the rotation of Saturn.

Origin of name : click here.