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. Due to its measured size and brightness it is expected to end in a supernova one day. Sein Name kommt vom arabischen رجل الجوزاء اليسرى Ridschl Dschauza’ al-Yusri ‚linker Fuß des Mittleren‘. With a temperature of 12,100 K, it shines with about 120,000 solar luminosities. Rigel is a blue supergiant that is the brightest star in the constellation Orion (the Hunter). The star has a radius almost 79 times that of the Sun and an estimated mass of 21 solar masses. Further observations of radial velocity variations indicate that it simultaneously oscillates in at least 19 non-radi… Obwohl er heller als α Orionis (Beteigeuze, 0,42 mag) ist, wird er in der Astronomie als β Orionis bezeichnet. Rigel A is a massive, luminous star of the spectral type B8 Ia, indicating a bright supergiant appearing blue or blue-white in colour. Rigel ist der hellste Stern im Sternbild Orion und der siebthellste des Nachthimmels. 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.