The brightest star of the constellation, which, together with Vega in Lyra to the west and Altair in Aquila to the south, forms the Summer Triangle. This bright blue-white supergiant (1.2 mag) is much farther away than other bright stars in our sky - it is located at a distance of 2600 light-years. In order for Deneb to be so bright from this distance, it must have a greater energy output than 60,000 Suns, making it one of the most luminous stars visible to the naked eye (for example, Vega is 25 light-years away from us and Altair is only 11 light-years away). Its mass is 19 times that of the Sun and its diameter is 203 times larger. The surface temperature reaches 8500K.