Monday, March 5, 2007

Dubhe Ursa Major -Tara




Dubhe is the second brightest star in the Big Dipper (Ursa Major) Constellation. It is a K star, which means it is only 500 million years old, compared to other stars it is quite young. It is the northern pointer star of its constellation. The other pointer is Polaris. But it is not one of Ursa Major’s moving stars; instead it is an evolved helium burning star. Which is approximately 123.5 light years away from us. It is not only an evolved helium based star, but it is a multiple star too. The star is orbited by a main sequence companion Dubhe B and Dubhe C.
The big dipper (formally Ursa Major) is a northern hemisphere constellation, it is visible throughout the whole year, but it is the easiest to see during dark clear skies. In earlier times Native Americans thought that it looked like a bear, and that the little dipper was the little bear. There are many Greek, Roman and Native stories on how the Big Dipper was put in the sky.
In the images above, there is the big dipper constellation, taken from a telescope and a diagram of the Native American diagram of the Bear.

Images from - http://www.physics.csbsju.edu/astro/constellations/images/ursa_major_l.gif
http://stardate.org/images/constellations/ursa_major.gif

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