DENEB - is the brightest star in the constellation Cygnus and one of the vertices of the Summer Triangle. It is the 19th brightest star in the night sky, with an apparent magnitude of 1.25. A white supergiant, Deneb is also one of the most luminous stars known. It is, or has been, known by a number of other traditional names, including Arided and Aridif, but today these are almost entirely forgotten.Deneb's absolute magnitude is about −8.5, placing it among the most luminous stars known.
Deneb's exact distance from the Earth is uncertain. The most likely distance is 3,200 light years, but the parallax uncertainties do not rule out a distance as close as 2,100 light years or as far as 7,400 light years. This distance uncertainty makes determining many of Deneb's other properties similarly imprecise. Deneb is the farthest first-magnitude star from Earth.
