what is sirius
Sirius (/ËsÉªriÉs/) is the brightest star (in fact, a star system) in the Earth's night sky. With a visual apparent magnitude of â1.46, it is almost twice as bright as Canopus, the next brightest star.irius is one of the 27 stars on the flag of Brazil, where it represents the state of Mato Grosso. Seven ships of Great Britain's Royal Navy have been called HMS Sirius since the 18th century, with the first being the flagship of the First Fleet to Australia in 1788.