Sirius system

The  was a binary star system centred on a duo of stars known as Sirius. (TV: The Curse of the Black Spot)

Astronomical data
Planets in the Sirius system included Sirius Alpha, (AUDIO: Max Warp), Androzani Major and Minor, (TV: The Caves of Androzani), Sirius IV (TV: Frontier in Space), Sirius 5. (TV: City of Death), and Quagreeg (AUDIO: Dead London).

History
There was apparently an art gallery on Sirius 5 that Romana thought could rival The Louvre. (TV: City of Death)

By the time of the Earth Empire, the Sirius system had been colonised by humans, though by 2540 Sirius IV was an independent dominion planet. (TV: Frontier in Space)

By the 51st century (PROSE: Diamond Dogs), the Sirius Conglomerate was a major power in the system, involved in activities on the planet Androzani Major, which held reserves of spectrox, a substance conferring longevity. (TV: The Caves of Androzani)