Sirius is the brightest star in the night sky. It is located in the constellation Canis Major. Sirius is really a binary system consisting of Sirius A, a white main sequence star, and Sirius B, a white dwarf. It is only 8.6 light-years distant from Earth.
Sirius has an apparent visual magnitude of -1.46 and the only brighter objects in the sky lie inside our own solar system.
Together with the stars Rigel in Orion, Aldebaran in Taurus, Capella in Auriga, Pollux and Castor in Gemini and Procyon in Canis Minor, Sirius forms the Winter Hexagon, an asterism in the night sky that can be spotted from December to March.
Sirius A and Sirius B in Canis Major
Photo: NASA/ESA (Hubble)