 Upsilon Cygni holds 9.3 times the mass of the Sun and is 4.7 times the Sun's radius.The rapid rotation is giving the star an oblate shape with an equatorial bulge that is 18% wider than the polar radius.It is radiating 7,305 times the solar luminosity from its outer atmosphere at an effective temperature of 22,000 K.

The star shows variations in luminosity, including short term non-radial pulsations with periods of 2.95 and 2.6 per day, as well as random outbursts occurring up to every few years.