page_title: Themisto (moon)
section_title: Characteristics
hierarchical_section_title: Themisto (moon) / Characteristics
context_page_description: Themisto or Jupiter XVIII, is a small prograde non-spherical moon of Jupiter. It was found in 1975, lost, and then refound in 2000.
context_section_description: Themisto's orbit is unusual. Unlike most of Jupiter's moons, which orbit in groups, Themisto orbits alone, midway between the Galilean moons and the first group of prograde irregulars.
  Themisto is about 8 kilometers in diameter (assuming an albedo of 0.04)
caption: Diagram illustrating Themisto's orbit (top left) among those of the other non-spherical moons of Jupiter. The moons above the horizontal axis are prograde, the moons beneath it are retrograde. The yellow segments extend from the pericentre to the apocentre, showing the orbital eccentricity.