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In a dark sky, look for the Northern Crown


Tonight for May 15, 2015

Corona Borealis, the Northern Crown, as captured by Fred Espenak.  Used with permission.  Visit Fred Espenak's Portal to the Universe.

Corona Borealis, the Northern Crown, as captured by Fred Espenak. Used with permission. Visit Fred Espenak’s Portal to the Universe.

Corona Borealis

Corona Borealis, the Northern Crown, as pointed out with a green laser pointer by Jan Wojcik, director of Reynolds Observatory. Image Credit: Kyle Foley

Corona Borealis

The C-shaped constellation Corona Borealis shines between the constellations Bootes and Hercules. View larger

Here is a constellation that’s easy to see on the sky’s dome, if your sky is dark enough. Corona Borealis – aka the Northern Crown – is exciting to find. It’s an almost-perfect semi-circle of stars. This beautiful pattern will adorn the evening sky from now until October.

The constellation Corona Borealis is located more or less along a line between two bright stars, Arcturus in the constellation Bootes the Herdsman and Vega in the constellation Lyra the Harp. At nightfall and early evening, you’ll see Arcturus fairly high in the east to southeast, noticeable for its brightness and yellow-orange color. Vega will be rather low in southeast – bright and blue-white in color. The Northern Crown is more or less between these two bright stars. It’s a semi-circle of stars – very noticeable in a dark sky.

The brightest star in Corona Borealis is Alphecca, also known as Gemma, sometimes called the Pearl of the Crown. The name Alphecca originated with a description of Corona Borealis as the “broken one,” in reference to the fact that these stars appear in a semi-circle, rather than a full circle. Alphecca is a blue-white star, with an intrinsic luminosity some 60 times that of our sun. It’s located about 75 light-years from Earth.

Bottom line: Look for Corona Borealis – the Northern Crown – between the brilliant stars Arcturus and Vega tonight! This constellation is very noticeable, if you have a dark sky.

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