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Last updated on April 24, 2014 at 11:09 EDT

Pleiades Reference Libraries

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Orion the hunter Constellation
2004-10-19 04:45:44

Orion (the hunter) Constellation -- Location: Celestial Equator (visible in both Northern and Southern Hemispheres); Coordinates: Right Ascension: 05h; Declination: -05; Source: Greek mythology, Arab, ancient Indian & Egyptian The pattern in the constellation Orion was recognized as a human figure by many ancient cultures. Orion's position on the Celestial Equator makes it visible all over...

Star Cluster
2004-10-19 04:45:42

Star Cluster -- Star clusters are physically bound systems of stars. In order of low compactness to high compactness (and in some sense also age) they range from stellar associations to open clusters to globular clusters. Star clusters are held together by the gravitation of their members. Due to both external (encounters with massive objects, influence of the host galaxy) and internal...

Open Cluster
2004-10-19 04:45:42

Open Cluster -- An open cluster is a group of star formed from a molecular cloud, the illuminated parts of which we see as one or more nebulae. They are also called galactic clusters since they exist within the galaxy. All the stars in an open cluster have more or less the same age and the same chemical composition, so any difference between them is solely due to their mass. Most open...

Pleiades
2004-10-19 04:45:40

Pleiades -- in astronomy, in astronomy, famous open star cluster in the constellation Taurus; cataloged as M45. The cluster consists of some 500 stars, has a diameter of 35 light-years, and is 400 light- years distant from the earth. Six stars are easily visible to the naked eyeAlcyone (the brightest), Electra, Celaeno, Sterope, Maia, and Taygete. Known as the Seven Sisters, this group...