Vab 7791 was a star system located in the Orion Neutrality Area, near the border with the Klingon Empire, in the Alpha or the Beta Quadrant. It was inside a dust cloud.
It was binary system, consisting of two almost-twin suns: one a yellow star, the other a white star.
The system was home to at least one planet, but had no Class M worlds. The first planet was called simply "Vab", an Orion-held world that served as a base to both the Orion Space Navy and Orion pirates. Its orbit took it between the two suns, where it received constant daylight and many kinds of dangerous radiation. The bravest pirates risked the dangerous "slot run" between the two stars to reach Vab. (FASA RPG module: The Orions: Book of Common Knowledge)