Deneb

Deneb (α Cyg / α Cygni / Alpha Cygni) is the brightest star in the constellation Cygnus and one of the brightest stars in the night sky, with apparent magnitude 1.25.

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It is, or has been, known by a number of other traditional names, including Arided, Aridif, but today these are almost entirely forgotten.

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Deneb's absolute magnitude is -7.2, placing it among the most luminous stars known.

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Deneb's exact distance from the Earth is a matter of some dispute; most equally distant stars are not visible to the naked eye, and may be identified only by catalog numbers, if they are known at all. Figures from 1600 to 3200 light years appear on various online sources. It should be noted that determination of distances at this range is very difficult because stars with such distances have negligible parallax. Moreover, the uncertainty about distance makes determining its other properties similarly imprecise.

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