Amalthea 

Amalthea (a nymph in Greek mythology) is a small moon of Jupiter discovered in 1892 by American astronomer Edward Emerson Barnard. The discovery happened to be the last satellite of any planet to be discovered visually through ground based observations. It has a visual geometric albedo of 0.05 making it a relatively dark moon with a reddish tint to the surface. The color is probably from gravity caught sulfur which originated from Io's active volcanoes.

Amalthea is also a moon of unique shape and dimensions. With a radius of 135x84x75 and dimensions of 270x165x150 kilometers in diameter, this satellite resembles more of a potato than a more common round ball. This is due to the fact that Amalthea's gravitational force is not large enough to pull itself into a sphere.

On the surface is a scattered multitude of impact craters, some as wide as 100 kilometers across and as deep as 8 kilometers. The largest crater on Amalthea is Pan while Gaea, though not as large width-wise is twice as deep depth-wise.

In addition, Amalthea has two mountains called the Mons Lyctas and the Mons Ida. These geographical features hold many mysteries that will remain unknown until further research can be conducted.

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.