Cygni alpha

Deneb (α Cygni, Cygni Alpha) is the the most brilliant star of the Constellation of the Cygne in spite of its great distance. Seen Ground, it is the twentieth most brilliant star (Magnitude connect 1,25) and with a absolute Magnitude located between -7,2 and -8,75, it is one of known stars most intrinsically luminous.

Its name comes from the Arab ذنب Al Dhanab , the tail . The same name was given to other stars, in particular Deneb Kaitos , the most brilliant star of the constellation of the Whale.

Deneb, Alpha Lyrae (Véga) and Alpha Aquilae (Altaïr), three very brilliant stars, are very visible in summer in the night sky and what is called form the Triangle of summer.

The exact distance from the Earth with Deneb is badly known; the majority of stars located at similar distances are not visible with the naked eye and can be identified only on catalogs of stars when it are known. Various sources give distances varying between 1600 and 3200 light-years (500-1000 Parsec). It should be noted that the determination of such distances is very difficult: the Parallaxe not being able to be used (the satellite Hipparcos gives a parallax of 0,001 arcsec, which corresponds to a distance from 1000 parsec; but the estimated error is 60%).

Its luminosity is approximately 60  000 times higher than that of the Sun: if Deneb were a point source of light located at the same distance that the Sun, its light would be more intense than the majority of the Laser S industrialists.

Without surprise, Deneb is a Supergéante blue, 200 times larger than the Sun (placed at its place, it would extend well beyond the terrestrial orbit), one of largest than one knows and a mass of 25 times that of the Sun. It will probably finish in Supernova from here a million years.

Designations

See too

  • List of most brilliant stars

External bond

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