SiriusSirius is the brightest star in the night sky. With a visual apparent magnitude of âˆ’1.46, it is almost twice as bright as Canopus, the next brightest star. The name "Sirius" is derived from the Ancient Greek: Î£ÎµÎ¯ÏÎ¹Î¿Ï‚ Seirios . The star has the Bayer designation Alpha Canis Majoris . What the naked eye perceives as a single star is actually a binary star system, consisting of a white main-sequence star of spectral type A1V, termed Sirius A, and a faint white dwarf companion of spectral type DA2, called Sirius B. The distance separating Sirius A from its companion varies between 8.1 and 31.5 AU.
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