Aldebaran (α Tauri) is a red giant star (K5III) in the constellation of Bull.
A binary star system at a distance of about 65 light years, Aldebaran is one of the most significant stars in the night sky. It is the main star in the constellation Bull and there marks the eye of the Bull. While the main star of this binary star system is only slightly heavier than our own Sun, its diameter is almost 45 that of our Sun. This makes it about 150 times as bright as our Sun. The companion of this huge main star is a red dwarf.
4h 35m 55.2s (68.98000°)
The magnitude (brightness) is measured on a logarithmic scale. Small numbers mean bright stars: A star with a brightness of 1 mag is 100 times brighter that an star with 6 mag.
The distance is measured in light years (LY). A light year is the distance, that light travels within one year. 1 LJ is equal to about 5,878,630,000,000 miles.
This star belongs to the huge UCAC 3 catalog. It is identified by this number in the UCAC 3 catalog.
Every star belongs to a constellation, and 12 of those constellations are part of the zodiac.
This is an ancient constellation. The reddish star Aldebaran marks the eye of the bull.
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