From Gineipaedia, the Legend of Galactic Heroes wiki
A star in the Centauri Starzone, along with Beta Centauri and Proxima Centauri. Alpha and Beta Centauri are the second closest stars to the Sol Starzone, at a distance of 4.37 light years.
Alpha Centauri was the destination of the Alpha Centauri Expedition launched in 2273 CE by the United Earth Government.(LOGH: 'To Earth')