Chaldea, also known as Jupiter XXI, is a retrograde irregular-satellite belonging to the outer planet of Jupiter. This satellite was founded by Scott S. Sheppard, David C. Jewett, Yanga R. Fernandez, and Eugene A. Mangier on November 23, 2000 at the Maura Ea Observatory in Hawaii. This satellite belongs to the Carmen group, a satellite group home to sixteen other satellites. This satellite makes one orbit around Jupiter in about 730 Earth days.
Common in the origin of many satellites in the Carmen group, Chaldean was formed from the remains of the creation of the Carmen group. It all started when a large D-type asteroid was pulled into Jupiter's gravitational pull. After suffering collisions, debris and pieces of the asteroids became the satellites of the Carmen group. The D-type asteroid that was pulled in, the largest, was named "Carmen".
All of the satellites in the Carmen group, except Kalmyk which is redder than the others, are light red. However, Chaldene is gray at the northern and southern poles, uncommon in the Carme group. In the Carmen lgroup, very few satellites, including this one, has mountainous areas. The surface contains few valleys and little to no craters, meaning it has suffered few impacts after its creation.