Himalia is the largest of the irregular-shaped satellites belonging to the planet of Jupiter. Being a prograde satellite, it was discovered on December 3, 1904 by Charles Dillon Perrine at the Lick Observatory. Due to its size and its brightness, Himalia is the easiest observed satellite of Jupiter. In fact, it is so large and massive, the only things larger are the Galilean moons. Although it is bright in apparent magnitude, Amalthea is brighter, yet further away and smaller, therefore being less easily observed by the human eye.
Himalia was a C-type asteroid that was being pulled in to Jupiter's orbit by its gravitational pull. After being pulled in to orbit, it suffered numerous collisions and debris from Himalia became the satellites of the Himalia group. Himalia is the largest of the group, which is the reason for the group being named after this moon.
Himalia was named after Himalia, the nymph that bore three sons from Zeus. In the 1950's and 1970's, people mistook the name Himalia for Hestia, a Greek goddess.
Like many other moons belonging to Jupiter, water is thought to be present inside of the layers of Himalia, sandwiched between two layers.
Surface color: yellow
The surface of Himalia appears to be yellow
In 2000, Himalia was photographed by the Cassini spacecraft. Only though the images were a few pixels in length and height, the images can show the axes of the moon match that of Earth-based measurements. The image was taken from five million miles away.
A moon found in 2000, called S/2000 J 11, a smaller moon, collided with Himalia and caused a streak to form near Himalia, which is possible to have formed a ring. This ring is 170 kilometers in diameter and was named the ring of Himalia. Astronomers gained the hypothesis from this event that Jupiter loses moons and gains moons from collisions.
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