Aldebaran

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Aldebaran (Arabic: الدَّبَرَان, lit. 'The Follower') is a red giant star in the zodiac constellation of Taurus. It has the Bayer designation α Tauri, which is Latinized to Alpha Tauri and abbreviated Alpha Tau or α Tau. Aldebaran varies in brightness from an apparent visual magnitude of 0.75 down to 0.95, making it the brightest star in the constellation, as well as (typically) the fourteenth-brightest star in the night sky. It is at a distance of approximately 67 light-years. The star lies along the line of sight to the nearby Hyades cluster, but is unrelated and much older than the young cluster. Aldebaran is a red giant with a radius about 45 times that of the Sun's, though its mass is about equal. This is because, with an age of over six billion years, the star is in the final stages of its life, having evolved off the main sequence on the Hertzsprung–Russell diagram after depleting the supply of hydrogen in its core. The star is cooler than the Sun with a surface temperature of 3,900...

Read on Wikipedia · Image Taurus_constellation_map.png: Torsten Bronger derivative work: Kxx (talk), CC BY-SA 3.0