Claim: Alpha Centauri has an abbreviation.
Evidence: Alpha Centauri A -LRB- α Cen A -RRB- has 1.1 times the mass and 1.519 times the luminosity of the Sun , while Alpha Centauri B -LRB- α Cen B -RRB- is smaller and cooler , at 0.907 times the Sun 's mass and 0.445 times its visual luminosity.