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Orbit: 185,520 km from Saturn
Orbital period: 23 hours
Gravity: 0.064 m/s²
Circumference: 1,245 km
Diameter: 392 km
Mass: 3.80e19 kg
Mimas is a moon of Saturn which was discovered in 1789 by William Herschel. It is named after Mimas, a son of Gaia in Greek mythology, and is also designated Saturn I.


Mimas’ low density (1.17) indicates that it  is composed mostly of water  ice with only a small amount of rock.

Saturn's moon Mimas


The surface of Mimas is dominated by an impact crater 130 km  across,       known as Herschel; it’s almost 1/3 of the diameter of the  entire       moon.  Herschel’s walls are approximately 5 km high,       parts of  its floor measure 10 km  deep, and its central       peak rises 6 km  above the  crater floor.       The impact that made this crater must have       nearly  disrupted Mimas. Fractures can be seen on the opposite  side of Mimas that  may be due to the same impact.

Saturn's moon Mimas

The surface is saturated with impact craters. But no others       are nearly  as large as Herschel.  This suggests that early   in its history, Mimas was  probably impacted by even larger       bodies than the one that created Herschel  which completely   disrupted the new moon (wiping out the evidence of  earlier   large impacts) but that the impact debris then  coalesced  again to form present-day Mimas.



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