Rigel is a blue supergiant that has exhausted the hydrogen fuel in its core, expanded and cooled as it moved away from the main sequence across the upper part of the Hertzsprung–Russell diagram. Obwohl er heller als α Orionis (Beteigeuze, 0,42 mag) ist, wird er in der Astronomie als β Orionis bezeichnet. With a temperature of 12,100 K, it shines with about 120,000 solar luminosities. Rigel A is a massive, luminous star of the spectral type B8 Ia, indicating a bright supergiant appearing blue or blue-white in colour. Sein Name kommt vom arabischen رجل الجوزاء اليسرى Ridschl Dschauza’ al-Yusri ‚linker Fuß des Mittleren‘. Further observations of radial velocity variations indicate that it simultaneously oscillates in at least 19 non-radi… Due to its measured size and brightness it is expected to end in a supernova one day. When it was on the main sequence, its effective temperature would have been around 30,000 K. Rigel's complex variability at visual wavelengths is caused by stellar pulsations similar to those of Deneb. Rigel is a blue supergiant that is the brightest star in the constellation Orion (the Hunter). Rigel ist der hellste Stern im Sternbild Orion und der siebthellste des Nachthimmels. The star has a radius almost 79 times that of the Sun and an estimated mass of 21 solar masses.

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