mardi 23 septembre 2008

Orion 8


Zeta Orionis (ζ Ori), traditionally known as Alnitak (Arabic: النطاق an-niṭāq), is a triple star some 800 light years distant in the constellation Orion. Together with Delta Orionis (Mintaka) and Epsilon Orionis (Alnilam), the three stars make up the belt of Orion, known by many names across many ancient cultures. Zeta Orionis (ζ Ori) is the left-most star.
The primary star is a hot blue supergiant with an absolute magnitude of -5.25, and is the brightest class O star in the night sky with a visual magnitude of 1.70. It has two bluish 4th magnitude companions. The stars are members of The Orion OB1 Association.


Kappa Orionis (κ Ori / κ Orionis / 53 Orionis) is the sixth-brightest star in the constellation of Orion. It also has the traditional name Saiph. To an observer in the northern hemisphere facing south, it is the lower left of the four bright stars that compose Orion's main quadrangle. The name is from the Arabic saif al jabbar, literally sword of the giant.
Kappa Orionis is the sixth brightest star in Orion. At 720 light years away and 15-17 solar masses, it is about the same distance away from the Sun, and about the same size, as Rigel. It has a much higher magnitude (2.06) than Rigel because it is a much hotter star, with a surface temperature of 26,000,000 degrees Fahrenheit. Such stars mostly radiate ultraviolet light. Large stars such as Saiph (and many other stars in Orion) are destined to collapse on themselves and explode as supernovae.
Saiph
As-Saif
The sword
سيف


Delta Orionis (δ Ori), traditionally known as Mintaka (from منطقة manţaqah, which means "belt" in Arabic), is a star some 900 light years distant in the constellation Orion. Together with Zeta Orionis (Alnitak) and Epsilon Orionis (Alnilam), the three stars make up the belt of Orion, known by many names across many ancient cultures. Delta Orionis (δ Ori) is the right-most star.

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