The planet's internal heat generated an abundance of geothermal energy. As a result of strong stellar winds, it … It lies in the northern constellation Cygnus and, Betelgeuse (Alpha Orionis) is approximately 1,000 times larger than our Sun, whereas Deneb (Alpha Cygni) is estimated to be only 200-300 times the size of our Sun. Star type Deneb is a blue-white supergiant of the spectral type A2 Ia. Not officially a star and not officially a planet, but somewhere in between based the sizes of the stars. Deneb is the brightest star in the Cygnus constellation and the 19th overall in the night sky. Click on image for full size. Deneb - White, Hot Supergiant What's in a Name: Arabic for "tail" because it is located in the tail of the Cygnus, the Swan. This was the homeworld of the Bandi, a telepathic humanoid species, and the Denebian slime devil. Deneb is a true supergiant, its diameter, calculated from its temperature and luminosity, is 108 times that of the Sun, half the size of Earth's orbit. It shines with an apparent visual magnitude of 1.25 and an absolute magnitude of -8.4 making it approximately 200,000 times more luminous than the Sun. Deneb brightness ranges from a magnitude of 1.338 to a magnitude of 1.273 over its variable period. White dwarfs are the smallest type stars, with a similar size to earth, and with extreme mass. The star is a pulsating Alpha Cygnus variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. It is 19 times more massive than the Sun and has expanded to a size of 203 solar radii. Brown Dwarf. Deneb’s Size and Age in Perspective: If our sun was the size of a marble, the diameter of Deneb would be equal to the size of a a prison cell. Brown dwarfs are strange altogether. In 2364, Deneb IV was at the edge of "the great unexplored mass of the galaxy". It is one of the stars that form the Summer Triangle, along with Altair in Aquila constellation and Vega in Lyra.. Deneb is also the brightest star of the Northern Cross, another prominent summer asterism found in the northern skies. Deneb, (Arabic: “Tail” [of the Swan, Cygnus]) one of the brightest stars, with an apparent magnitude of 1.25. With an estimated temperature of 8,525 K, it is 196,000 times more luminous than the Sun. Deneb, Alpha Cygni, is the brightest star in Cygnus constellation and the most distant of all first magnitude stars.. Deneb is a luminous blue supergiant. The mass of these stars can be equal to that of the sun. However, the size of Deneb is estimated to be 108 times that of our star, so that if Deneb was at the center of our Solar System its diameter would extent to half as far as the orbit of the Earth. Variable Type of Deneb. 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