While in orbit of Meridian, the USS Defiant launched a probe into the sun's corona. Probe telemetry revealed that the fusion reactants in the sun's core were out of balance, creating a cascade reaction on the quantum level which caused Meridian to shift between dimensions. (DS9: "Meridian") According to Star Trek: Star Charts (p. 75), the Trialan sun was classified as a F-class star. According to StarTrek.com, the primary was named Trialus.