A binary system comprised of two white stars of massively different size and mass:
Sirius A, a large, peculiar, and extremely bright type A star over twice as massive as Sol of Old Terra.
Sirius B, a white dwarf of extreme mass for its diameter, nearly as massive as Sol, but only the size of Old Terra.
This binary system is home to the Ssraad. The Green Ssraad control ancient habitats in orbit around Sirius A. The only non-ssraad they allow in the system are their slaves (and future meals). Their rivals, the Blue Ssraad, nest in stolen asteroid habitats huddled close to the cinder of Sirius B.
Both ssraad groups launch raids into other systems.