The home star system of the Visitors. Their home planet is Sirius IV. More Source

Sirius (meaning "scorching" in Greek), also known as the dog star, is the brightest star in the sky (except for the sun). It is in the constellation Canis Major (The Great Dog). Sirius is a main sequence star that is about 70 times more luminous than the sun. It is about 8.6 light-years from Earth. It has an apparent magnitude of -1.46 and an absolute magnitude of +1.4. Sirius has a companion star (called the Pup), which is a white dwarf.

The brightest star in the night sky, Sirius was the embodiment of Isis, sister and consort of the god Osiris, who appeared in the sky as Orion. Sirius first appeared in the dawn sky each year around the time of the summer solstice and just before the Nile's flood season. Egyptians believed Sirius was responsible for the rains, so it was vital to accurately predict its arrival. Sirius was the centerpiece of Egypt's 365-day solar calendar, and its appearance marked the beginning of the new year.

The Dog Star, the brightest star in the night sky. An extremely potent, binary (possibly ternary) star, Sirius is the focal point of several religions (notably the ancient Egyptian). See Fixed Stars.

Sirius (α CMa / α Canis Majoris / Alpha Canis Majoris) is the brightest star in the night-time sky, with a visual apparent magnitude of −1.47. This binary star system consists of a white main sequence dwarf star and a faint white dwarf companion. It is located in the constellation Canis Major.

SIRIUS is a constellation of geostationary satellites operated by SES SIRIUS operating from 5° East in the Clarke Belt. They carry digital satellite television to the countries of Scandinavia, including the Viasat pay TV system.