Callirrhoe

Callirrhoe
Planet of Origin	Jupiter
Discoverer	Spacewatch
Date of Discovery	October 6 through November 4, 1999
Place of Discovery	Kitt Peak National Observatory
Surface Color	Grey
Alternate Name(s)	Jupiter XVII

Callirrhoe, also known as Jupiter XVII, is a retrograde irregular-shaped satellite belonging to the outer planet of Jupiter. It is part of the Pasiphae group, a group in which Pasiphae is the largest satellite of said group. The others include other satellites such as Sinope. This satellite was not found by an astronomer, but instead by a spacecraft named Spacewatch between the months of October and November of 1999. It was found at the Kitt Peak National Observatory. Callirrhoe is fainter than the dwarf planet, Eris, making Jupiter nearly three million times brighter than this satellite.

Formation

This satellite's surface matches those of many different genres of asteroid types such as D, P, and C-type asteroids, which contain mixtures of carbon, ice, and sometimes water. These asteroids make up the entire Asteroid belt. The most populous of these asteroids is the C-type, which the origin of this satellite is believed to most likely be.

Surface

The surface is grey, which is common between carbonaceous (C-type) and D-type asteroids. The surface is not cratered but is relatively smooth compared to other asteroids. The ends of the surface are mostly filled with mountainous geographical features. There is no volcanic activity, and no volcanoes are believed to exist on the surface.