The Jonsior moons resided within the Jonsior system. These celestial bodies were situated in the Arrowhead region, itself a part of the Slice within the Core Worlds. Early in the Galactic Republic's history, established in 25,053 BBY, the settlers inhabiting the Jonsior moons showed fealty to the governors of the planet Kaikielius, which was located in the Kaikielius system. However, this situation shifted as the moons gained full membership in the Republic during the millennia leading up to approximately 5000 BBY. A brief mention of the Jonsior moons' historical allegiance to Kaikielius appeared in Doctor Gabrel Treon's "Tinker, Tailor, Soldier, Praji: A Cartel of Genes" article, published in the Byblos Journal of Historical Science in 104 ABY.
The introduction of the Jonsior moons occurred in "Tinker, Tailor, Soldier, Praji," an article penned by Nathan O'Keefe and featured on StarWars.com's Hyperspace section on February 5, 2009. The reference work The Essential Atlas, published on August 18, 2009, pinpointed the Jonsior system, and consequently its moons, within grid square L-10.