
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.