Sirius (á CMa / á Canis Majoris / Alpha Canis Majoris) (IPA:
[ˈsɪ.ɹi.əs]) is the brightest star in the night-time sky, with a
visual apparent magnitude of −1.47. It is located in the
constellation Canis Major. Sirius can be seen from almost every
inhabited region of the Earth's surface (those living north of
73.284 degrees cannot see it) and, in the Northern Hemisphere, is
known as a vertex of the Winter Triangle. The best time of year to
view it is around January 1, when it reaches the meridian at
midnight.
Under the right conditions, Sirius can be observed in daylight with
the naked eye. Ideally the sky must be very clear, with the
observer at a high altitude, the star passing overhead, and the sun
low down on the horizon.[4]
What to the eye appears as a single star is actually a binary star
system, consisting of a bright white main sequence star of spectral
type A0 or A1, named Sirius A, and a faint white dwarf companion,
named Sirius B.
http://en.wikipedia.org/wiki/Sirius
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