The Double Cluster, or Caldwell 14, is the name for two open clusters – NGC 869 and NGC 884 – located close together in Perseus constellation. Also known as h Persei and χ Persei (h and Chi Persei), the clusters both lie at an approximate distance of 7,600 light years from Earth and are about 12.8 million years old.
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The Winter Hexagon, also known as the Winter Circle, is a prominent winter asterism formed by seven stars prominent in the winter sky.
The brightest stars in the cluster represent the Pleiades, the Seven Sisters in Greek mythology, and their parents, the nymph Pleione and the Titan Atlas.
Messier 45 is one of the nearest star clusters to Earth. Its brightest stars lie at a distance between 390 and 460 light years. The cluster is mostly composed of hot, blue, highly luminous stars belonging to the spectral class B with an estimated age under 100 million years.
Read More »Pleiades: The Seven Sisters (Messier 45)