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The primary star, Rigel A, is a blue-white supergiant estimated to be anywhere from 61,500 to 363,000 times as luminous as the Sun, depending on the method used to calculate its properties and assumptions about its distance. It has exhausted the hydrogen in its core and expanded to over 70 times the Sun's radius (). It pulsates quasi-periodically and is classified as an Alpha Cygni variable.
Alpha Cygni variable