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Wednesday, July 30, 2014

EarthSky Tonight—Nov 23, Northern Crown shines after dusk and before dawn

Courtesy of EarthSky
A Clear Voice for Science
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www.EarthSky.org

phase23 EarthSky Tonight—Nov 23,  Northern Crown shines after dusk and before dawn 10nov23 430 EarthSky Tonight—Nov 23,  Northern Crown shines after dusk and before dawn At nightfall and early evening, the bowl-shaped constellation Corona Borealis – the Northern Crown – shines to the lower right of the star Vega, close to your western horizon. Can you spot brilliant Vega shining rather high in the western sky at nightfall? It can guide you to the Northern Crown.

You will need a dark sky to see the Northern Crown, which is a glittery semicircle of stars. See the pattern of The Keystone? It is part of the constellation Hercules, and it lies between Vega and the Northern Crown. So, you would be star-hopping from Vega, to the Keystone, to the Crown.




corona borealis1 EarthSky Tonight—Nov 23,  Northern Crown shines after dusk and before dawn
Credit: Chandra X-ray Observatory site






The Alpha star or brightest star in the Northern Crown is called by two names: Alphecca and Gemma. The star name Gemma means ‘bright one of the dish.’


The Micmac Indians living in southeastern Canada see this C-shaped configuration as the Bear’s Den, the home of Celestial Bear. For a few weeks at this time of year, Corona Borealis (the Bear’s Den) is seen in the western sky after dusk – and then, in the eastern sky before dawn. This double feature announces the coming of hibernation season.

Meanwhile, the Pawnee of the Great America Plains called Corona Borealis the Circle of Chiefs, noting that this star formation and the Pleiades star cluster trade places in the sky every 12 hours.

Written by Bruce McClure

 



Astronomy Picture of the Day from NASA/JPL

CHANDRA Photo Album

U.S. Naval Observator Astronomical Information center

Universe Today

StarDate Online

Sky and Telescope

National Geographic

Space Com

Simostronomy Blog

Amazing Space

The York County Astronomical Society

Scope City

James S McDonnell Planetarium

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