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Ursa Major constellation characteristic of the northern sky, formed by a core group of seven stars arranged according to a cart with steering scheme (hence the popular name of the Big Dipper). The Latins will depict seven oxen, whence the name given to the northern part of the northern hemisphere sky. 7 stars, have its own name, 6 brighter, the α (Dubhe), the β (Merak), the γ (Phecda), the ε (Alioth), the ζ (Mizar) and η (Benetnash), which, except Dubhe and Benetnash, form an open star cluster, along with many other less brilliant. The reference to the asterism as a bear (the four Eastern Star) chased by three hunters (three in the queue) is probably the most ancient myth in which the still refers humanity. In other parts of the world are different names used in North America is the Big Dipper, in the United Kingdom is the Plow, Septem Triones, that is, the seven oxen, instead the term with which the ancient Romans called it the seven stars of Ursa Major, describing their slow motion around the pole star.

The North Star can be found by drawing a line between Dubhe and Merak, the extreme of the Big Dipper, and extending it by five times. Other stars like Arturo (α Boötis) and Spica (α Virginis) can be found instead of prolonging the long side. In 1869, Richard. A. Proctor noted that, except for Dubhe and Alkaid, the stars of the Big Dipper all have the same proper motion, which leads to a common point of Sagittarius. This group, now known as the Ursa Major Moving Group, which have been identified as some other members, formed in the past an open cluster. The Ursa Major contains some double stars, although not many given the size of the constellation. Some of them are particularly popular, and easy to fix.



To open the video click on the image, good view from your Alessandro Brizzi.

Ursa Major constellation characteristic of the northern sky.