Scott S. Sheppard, Yanga R. Fernandez, David C. Jewett, and Eugene A. Magnier

Date of Discovery

November 23, 2000

Place of Discovery

Mauna Kea Observatory

Surface Color


Alternate Name(s)

Jupiter XXIV

Iocaste, also known as Jupiter XXIV, is a retrograde irregular satellite belonging to the outer planet of Jupiter. This satellite was discovered by Scott S. Sheppard, Yanga R. Fernandez, David C. Jewett, and Eugene A. Magnier on November 23, 2000 at the Mauna Kea Observatory. This satellite belongs to the Ananke group, a group of irregular retrograde satellites with the largest satellite of the group being Ananke.


Iocaste is part of the Ananke group, which means it was created from the remains of the creation of this group. When an asteroid from the Asteroid belt was brought in by Jupiter's gravitational pull, it suffered several collisions. The broken pieces became the satellites of the Ananke group, with Ananke being the largest.


Since it is part of the Ananke group, the surface is mostly brown. Ananke grouped satellites mostly have snowy poles either in the north, south, east, and western poles. Iocaste has a snowy patch that covers the entire western pole. There are some mountainous areas in the middle and southern areas of Iocaste. There are also valleys present on the surface.

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