Showing posts with label Corona. Show all posts
Showing posts with label Corona. Show all posts

Monday, July 29, 2013

Hercules Isn't Too Bright

This month is all about the guys in the sky. First we'll talk about Hercules and later in the month we'll explore Ophiuchus the Serpent Wrestler.
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As strong as Hercules was, he sure has some dim stars in the sky. Hercules is not an easy guy to find up there - his brightest stars being only of third magnitude. The best way to find Hercules is to look for the keystone, or four sided figure that makes up his body. Hercules is said to be kneeling. Unfortunately for him (and our imagination), he is kneeling upside-down. Look for the brighter constellations around Hercules - Draco is above, Lyra to the left, Corona Borealis to the right, and Ophiuchus the Serpent Charmer below him.

The brightest star in Hercules is Ras Algethi which means, in ancient Arabic, "Head of the Kneeler." This must be some acrobatic kneeler standing on his head! The star is a red supergiant 600 times the diameter of our sun. that varies in brightness. Aim a small telescope at Ras Algethi and you will discover that it is really two stars in one.

The most interesting feature in the figure of Hercules is fuzzy area in the sky called M 13. M 13 is a globular cluster - a cluster of around 300,000 stars - the brightest of its kind in the northern skies. M stands for Messier object, and these are nebulae and galaxies charted by the French astronomer Charles Messier. This cluster is number 13. You can see M 13 with the naked eye but try viewing it through some binoculars to achieve a sparkling effect.
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Thursday, July 14, 2011

Corona Bowl-ealis - The Northern Bowl

Ancient Greeks believed Corona Borealis to be the beautifully jeweled crown given to Ariadne after she was dumped by Theseus. But the formation of stars is so distinct that many other cultures saw different images in this region of the sky. For example the Australian Aborigines thought this constellation was a boomerang flying through the heavens. In a Native American legend it is the cave where the great bear lives. And at different seasons it looks like either a smile or a frown.
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The Shawnee Indians saw the seven stars of the crown as seven beautiful maidens. One story tells of a brave hunter named White Hawk who was resting in a clearing one warm summer day. He was jolted awake by a giant silver basket descending by a silver cord from the clouds. Upon closer inspection, White Hawk noticed that the basket was occupied by seven stunning young women. When the basket touched the ground, the maidens stepped out of the basket and danced wildly in a ring. White Hawk watched from a good distance but crept closer. He was so enthralled that he wanted to ask the most beautiful maiden to be his bride. But when he approached, the women jumped into the basket, pulled the silver cord and flew back into the sky once more.
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The next day, White Hawk returned to the same clearing at the same time. This time he disguised himself as a rabbit in the hopes of getting closer to the babes. Sure enough, the basket with the women descended again to the ground. They danced. He hopped closer (as a bunny)... but the disguise didn't work. The women jumped back into the basket, pulled the cord, and flew skyward. "Drat," White Hawk said.
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So he tried it again the next day - this time disguised as a mouse. And for some strange reason, maybe his costume was better, maybe he was mousy already, the disguise worked. He scurried up to the seven maidens and grabbed the fairest of them all, and carried her away. White Hawk is represented by the bright star Arcturus, while the fairest of the maidens is brightest star in the Northern Crown, Alphecca.
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The name Alphecca comes from an Arabic word meaning, "Bright one of the Dish." This refers to the Arab vision of this as a dish or bowl. Thus I call it "Corona Bowl-ealis." It's all a matter of perspective.
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Monday, June 21, 2010

Corona Borealis - The Northern Crown

This is one of the most identifiable constellations in the sky. Although Corona Borealis has almost all dim stars, the outline of the seven form a subtle ring of sparkling jewels. The constellation lies between Bootes the Bear Driver and the mighty Hercules. The best way to find it is first find the Big Dipper. Go do the handle of the Big Dipper but do not follow the arc to the bright star Arcturus, straighten out the line (go farther left or east) and there you will find the lovely crown.

The Greeks likened this star picture to the crown presented to a beautiful maiden named Ariadne. She fell in love with the Prince of Athens, Theseus. Unfortunately for their love affair, Theseus was chosen to be sacrificed in the great labyrinth whose twisting halls were roamed by the vicious Minotaur - half man, half bull. Before Theseus was thrown into the labyrinth, Ariadne gave him a sword to kill the beast and a huge spool of thread. Theseus tied one end of the thread to the entrance and reeled out the thread as he walked through the maze. This way, he would be able to find his way out.

Theseus killed the Minotaur and followed the thread back to Ariadne’s arms. They lived happily ever after for only a few years. Theseus got bored with family life and left Ariadne high and dry. The god of wine Bacchus took pity on Ariadne for this slimy act and granted her the most beautiful crown in the world. Upon her death, the crown was placed in the skies for all to see.

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