地球質量
Deneb is a bluish-white star of spectral type A2Ia, with a surface temperature of 8,500 Kelvin. Since 1943, its spectrum has served as one of the stable references by which other stars are classified. Its mass is estimated at 19 . Stellar winds causes matter to be lost at an average rate of per year, 100,000 times the Sun's rate of mass loss or equivalent to about one Earth mass per 500 years.