Centero was a planet where the Terran Federation had a communications centre. The communications centre was attacked by Roj Blake and his crew on the Liberator in order to steal a cipher machine from the facility. (TV: Seek-Locate-Destroy)
Blake's plan to steal the cipher seems to have been earlier on his mind as he ordered Zen to plot a course to the planet, immediately following his attack on Saurian Major (TV: Time Squad). However, certain events distracted the Liberator en route before finally getting there (TV: The Web; PROSE: Trigger Point).