This diagram compares the orbital elements and relative sizes of the known members of the Himalia group as of April 2026. The horizontal axis illustrates their average distance from Jupiter, the vertical axis their orbital inclination, and the circles their relative sizes.
The Himalia group (or family or cluster; also referred to as the 28° inclination cluster or simply the prograde group) is a group of prograde irregular satellites of Jupiter, named after its largest member, Himalia. The group is thought to have formed from the fragmentation of a captured asteroid that was involved in a collision, making them a probable collisional family. Though the moons follow generally similar orbits, and the moons with measured colours appear compatible with a common origin, the dispersion of their orbital elements is too large to be conventionally explained, suggesting post-formation scattering of the satellites or a particular set of circumstances of their collisional event.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).