Orion's Belt

by Bryan February. 28, 2012 3155 views

Orion's Belt or The Belt of Orion is an asterism in the constellation Orion. It consists of the three bright stars: ζ Ori (Alnitak), ε Ori (Alnilam), and δ Ori (Mintaka). Alnitak is approximately 800 light years away from Earth and, taking into consideration ultraviolet radiation, which the human eye cannot see, Alnitak is 100,000 times more luminous than the Sun. Alnilam is approximately 1340 light years away from earth and shines with magnitude 1.70. Considering ultraviolet light Alnilam is 375,000 times more luminous than the Sun. Mintaka is 915 light years away and shines with magnitude 2.21. Mintaka is 90,000 times more luminous than the Sun. Mintaka is a double star. Both stars orbit around each other every 5.73 days. Looking for Orion's Belt in the night sky is the easiest way to locate the constellation Orion in the sky. In the Northern hemisphere, Orion's Belt is best visible in the night sky during the month of January at around 9.00 pm. —from wikipedia

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