sentences:  Consequently, the Chinese name for Delta Cygni itself is (, ).The primary, Delta Cygni A, is a blue-white giant star of spectral class B9, with a temperature of 10,500 K. It is nearing the end of its main-sequence life stage with a luminosity 155 times that of the Sun, a radius of 5.13 solar radii, and a mass approximately 2.93 solar masses.Like many hot stars, it spins rapidly, at least 135 kilometers per second at the equator, about 60 times that of the Sun.