The Bull's bloodshot eye

Aldebaran is such an eye-catching luminary in the dark sky, positioned within the boundaries of the Taurus constellation. It is one of the easiest stars to locate and is known for its reddish hue.

Being a red giant star means that it is much bigger and colder than our Sun. At about 65 light-years away from Earth, this star looks quite distinct, especially between late November and early December. With an apparent magnitude of 0.86, it ranks among the fifteen brightest stars in the night sky.

In Arabic, its name means "the Follower" because it usually follows the shining cluster of Pleiades when they rise in the dark.

Its interesting story, found in numerous traditions and myths, has made it one of the most well-known astronomical bodies among both ancient and contemporary stargazers.

Red giant's facts

  • Name Origin:The name comes from the Arabic "الدبران" (al-Dabarān), meaning "the Follower".
  • Location:It is located in the zodiac constellation of Taurus and is one of the easiest stars to find in the night sky.
  • Brightness:It varies in brightness from about 0.75 to 0.95, making it the brightest star in the Taurus constellation and one of the brightest in the night sky.
  • Distance:Approximately 65.3 light-years away from Earth.
  • Star Type:A red giant star, cooler than our Sun but much larger, with a surface temperature of 3,910 Kelvin.
  • Mass:About 16% more massive than the Sun.
  • Size:Has a diameter about 44 times that of the Sun, approximately 61 million kilometers.
  • Variability:A slightly variable star, with a small range of brightness fluctuations.
  • Proper Motion:Over the past 2,000 years, it has shifted about 7 minutes of arc in the sky.
  • Asterism:Part of an asterism and often used as a reference star for other celestial objects.
  • Observation:Extensively studied and used as a benchmark star for various astronomical missions and instruments, including Gaia and the Hubble Space Telescope.

Compared to our Sun

surface comparison

A red giant star like Aldebaran is known for its immense size, with a diameter roughly 44 times larger than the Sun. It is also more massive, containing about 16% more mass than our Sun. However, it has a lower surface temperature of around 3,910 Kelvin compared to about 5,500 Kelvin for the Sun.

The most remarkable thing about this star is its luminosity; it shines with a brightness about 518 times greater than that of the Sun. In contrast, the Sun, a G-type main-sequence star, primarily fuses hydrogen into helium, making it smaller, less massive, and hotter. As a result, Aldebaran has lower surface gravity, approximately 1.59 cm/s², typical for giant stars but much lower than the Sun's.

The surface of Aldebaran contains elements like carbon, oxygen, and nitrogen. This pattern suggests the star has undergone its first dredge-up stage, a process where material from the core is brought to the surface by convection, a key step in the evolution of a star into a red giant.

Location & spoting

star location

Aldebaran is a star located in the Taurus constellation, one of the twelve zodiac signs. As part of the Taurus constellation, it stands out as a prominent star in the night sky. To locate it, you can track the three stars that represent Orion’s Belt in the Orion constellation. Instead of following the path toward Sirius, if you go in the opposite direction, you will easily find Aldebaran as the first bright star.

Because it's easy to recognize, many people consider it an important object in the celestial sphere. Aldebaran is best viewed during late autumn and early winter, generally between the beginning and middle of December. At this time, its brilliance is most apparent in the eastern sky after sunset during the winter months.

  1. The first step is to find the three bright stars that form a line in Orion's Belt. During winter, Orion can be easily identified, although there are other constellations that might resemble it.
  2. After you've identified these stars, extend an imaginary line through Orion's Belt, moving away from the constellation Orion and opposite to the bright star Sirius.
  3. Along this pathway, you'll find a bright star — Aldebaran — which is often one of the brightest stars in that region. Its reddish color can help you distinguish it from other surrounding stars.

Mythology

Aldebaran is a star that has held significant meaning in various cultures and myths:

  • Originally, in Arabic, it was called نَيِّر اَلدَّبَرَان (Nayyir al-Dabarān), meaning "the bright one of the follower," as it appears to follow the Pleiades. This name was also sometimes used for the Hyades cluster. The modern name Aldebaran became common only relatively recently.
  • In Mexican culture, the Seris of northwestern Mexico see this star as the light for the seven women giving birth, represented by the Pleiades. They call it Hant Caalajc Ipápjö, Queeto, or Azoj Yeen oo Caap ("star that goes ahead"). They even named a lunar month in October "Queeto yaao" ("Aldebaran's path") in its honor.
  • In Australian Aboriginal culture, particularly among the indigenous people of Clarence River in Northeast New South Wales, Aldebaran is linked to the story of Karambal. According to this tale, Karambal, an ancestor who kidnapped another man's wife, was pursued until he hid in a tree that was set ablaze. He rose as smoke towards heaven, where he became the star Aldebaran.
  • The concept of Taurus as a bull was shared among several cultures, including the ancient Greeks, Egyptians, Babylonians, and Romans. Some Native American cultures depicted it as a bison, while for the Inuit people, it resembled a polar bear.