Star
Deneb
White star · A2Ia
α Cygni · Cygnus
Shown in its true colour — like most stars, it is too far away to photograph as more than a point of light.
Deneb is a blue supergiant star in the constellation of Cygnus. It is the brightest star in the constellation and the 19th brightest in the night sky, with an apparent magnitude slightly varying between +1.21 and +1.29. Deneb is one of the vertices of the asterism known as the Summer Triangle and the "head" of the Northern Cross. Its Bayer designation is α Cygni, which is Latinised to Alpha Cygni, abbreviated to Alpha Cyg or α Cyg.
Description from Wikipedia (CC BY-SA 4.0).
In your sky
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Key facts
Distance
~1,412 light-years
Apparent mag.
+1.25
Spectral type
A2Ia
Luminosity
51,618 × Sun
Absolute mag.
−6.93
Catalogue
HIP 102098
Spectral type
A2Ia
True colour from its B–V index (0.09): a surface around 9100 K.
Did you know
- Deneb is also known as α Cygni.
- Its spectral type A2Ia marks it as a white star.
- It lies in the constellation Cygnus.
