Deneb's adopted distance from the Earth is around . This is derived by a variety of different methods, including spectral luminosity classes, atmospheric modelling, stellar evolution models, assumed membership of the Cygnus OB7 association, and direct measurement of angular diameter. These methods give different distances, and all have significant margins of error. The original derivation of a parallax using measurements from the astrometric satellite Hipparcos gave an uncertain result of 1.01 ± 0.57 mas that was consistent with this distance. However, a more recent reanalysis gives the much larger parallax whose distance is barely half the current accepted value. One 2008 calculation using the Hipparcos data puts the most likely distance at , with an uncertainty of around 15%. The controversy over whether the direct Hipparcos measurements can be ignored in favour of a wide range of indirect stellar models and interstellar distance scales is similar to the better known situation with the Pleiades.