Uranus's Moon - Miranda

M iranda was named after the daughter of the magician Prospero in Shakespeare's play The Tempest. It was discovered by Gerard Kuiper in 1948. Miranda is not one of the larger satellites of Uranus; however, it was the one that was approached the closest by Voyager 2. This was not the satellite scientists would have chosen to get close to if they had a choice, but they had no choice. Voyager 2 had to fly close to the planet in order to get the boost it needed to go to Neptune. The resolution at which the larger satellites were photographed was around 2 to 3 kilometers (1.2 to 1.9 miles). On the other hand, details on the order of a few hundred meters can be seen on Miranda. Fortunately, Miranda turned out to be the most remarkable of all the satellites.

M iranda's surface is unlike anything in the solar system with features that are jumbled together in a haphazard fashion. Miranda consists of huge fault canyons as deep as 20 kilometers (12 miles), terraced layers and a mixture of old and young surfaces. The younger regions might have been produced by incomplete differentiation of the moon, a process in which upwelling of lighter material surfaced in limited areas. Alternatively, scientists believe that Miranda may have been shattered as many as five times during its evolution. After each shattering the moon would have reassembled from the remains of its former self with portions of the core exposed and portions of the surface buried. Miranda's appearence can be explained by theories, but the real reason is still unknown.

G iven Miranda's small size and low temperature (-187° C or -335° F), the degree and diversity of the tectonic activity on this moon has surprised scientists. It is believed that an additional heat source such as tidal heating caused by the gravitational tug of Uranus must have been involved. In addition, some means must have mobilized the flow of icy material at low temperatures.

PHYSICAL DATA FOR MIRANDA
 Mass (kg) 6.33e + 19
 Mass (Earth = 1) 1.0592e - 05
 Radius (km) 235.8
 Radius (Earth = 1) 3.6971e - 02
 Mean Density (g/cm3) 1.15
 Mean Distance from Jupiter (km) 129,780
 Magnitude (V0) 16.3


ORBITAL DATA FOR MIRANDA
 Rotational period (days) 1.413479
 Orbital period (days) 1.413479
 Mean orbital velocity (km/s) 6.68
 Orbital eccentricity 0.0027
 Orbital inclination (degrees) 4.22
 Escape (km/s) 0.189
 Albedo 0.27


Physical Data Key
 
Mass Mass
Mass Mass compared to that of Earth.
Radius Radius
Radius Radius compared to that of Earth.
Mean Density Average Density.
Distance Distance to the planet's center.
Magnitude The brightness of a star or object.
 
 
Orbital Data Key
 
Rotational Period Number of days to make one complete rotation.
Orbital Period Number of days to obital the planet.
Mean Orbital Velocity Average obital speed.
Orbital Eccentricity Eccentricity.
Orbital Inclination The tilt of the moon or planet.
Escape Escape Velocity.
Albedo Visual geometric albedo.

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