However, modern spectroscopy gives it as designation of G9 V. The radius of Sigma Draconis has been directly measured using interferometry with the CHARA array, which yields a result of 77.6% of the Sun's radius.
Modern spektroskopi ger emellertid Alsafi spektralklass G9 V. Radien hos Alsafi har uppmätts direkt med interferometri med CHARA Array, vilket anger den till 77,6 procent av solens radie.