Open Cluster

Caldwell 41 – Hyades

The Hyades is a prominent open star cluster located in the constellation Taurus, easily recognizable for its V-shaped arrangement of stars and its proximity to the red giant star Aldebaran.

The Hyades is one of the nearest and most prominent open star clusters to Earth, situated in the constellation Taurus. Comprising hundreds of stars, it forms a distinctive V-shaped pattern in the night sky. The cluster’s most notable feature is its proximity to the bright red giant star Aldebaran, which is often mistaken for being part of the cluster but is merely a foreground star.

Location and neighborhood.

The Hyades is located in the constellation Taurus, positioned in the northern celestial hemisphere. Specifically, it forms a V-shaped pattern that represents the face of Taurus the Bull. This open star cluster is easily visible to the naked eye and is situated to the northwest of the bright red giant star Aldebaran, which is often associated with the eye of the bull in Taurus. During the winter months in the Northern Hemisphere, the Hyades is a prominent celestial feature that can be observed in the night sky.

To the northwest of the Hyades lies the bright red giant star Aldebaran, which is not a member of the cluster but appears in the same line of sight. The Hyades is part of the Taurus Molecular Cloud, a large complex of interstellar dust and gas where new stars are actively forming. Nearby, the Pleiades, another well-known open star cluster, is situated in the same Taurus constellation. The cosmic neighborhood of the Hyades provides a fascinating glimpse into the dynamics of stellar evolution, star formation, and the interconnectedness of celestial objects within our galactic vicinity.

Unique facts

  • The Hyades is easily identifiable due to its V-shaped pattern, and it is often associated with the red giant star Aldebaran. While Aldebaran appears to be part of the cluster, it is merely a foreground star and not gravitationally bound to the Hyades.
  • The Hyades is an open star cluster, meaning its stars formed from the same giant molecular cloud and are loosely bound by gravity. It is one of the nearest open clusters to Earth, making it an important target for astronomers studying stellar evolution.
  • The age of the Hyades is estimated to be around 625 million years, making it relatively young in astronomical terms. This age allows astronomers to study the evolution of stars over a specific time frame, providing insights into the life cycle of stars similar to our Sun.
  • The Hyades is associated with the Taurus Molecular Cloud, a vast region of interstellar gas and dust where stars are actively forming. This association places the Hyades in a broader context of ongoing star formation processes within the Taurus constellation, adding to its significance in the study of stellar birth and evolution.

Brightness and size

The Hyades is a relatively bright open star cluster. The combined light of its member stars gives it an apparent magnitude of about 0.5, making it easily visible to the naked eye.
The Hyades is located at a distance of approximately 153 light-years from Earth. This makes it one of the closest open star clusters to our solar system.
The Hyades spans a region of space with a diameter of about 20 to 30 light-years. This size measurement considers the extent of the cluster as defined by its member stars.
When observed from Earth, the angular size of the Hyades is about 5 degrees. In terms of arcseconds, which is a more detailed measure of apparent size, this corresponds to approximately 300 arcminutes or 18,000 arcseconds. This measurement takes into account the angular diameter of the V-shaped pattern formed by the stars of the cluster in the night sky.