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Vega

Winter Triangle

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winter triangle asterism,betelgeuse,procyon,sirius

The Winter Triangle, or the Great Southern Triangle, is an asterism formed by Betelgeuse, Procyon, and Sirius. The three bright stars form an equilateral triangle… Read More »Winter Triangle

Northern Cross

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northern cross asterism,northern cross constellation,cygnus constellation,swan constellation

The Northern Cross is a prominent asterism formed by the brightest stars in the constellation Cygnus. Deneb, Sadr, and Albireo form the pole, and Fawaris… Read More »Northern Cross

Summer Triangle

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summer triangle asterism

The Summer Triangle is an asterism formed by Vega, Altair and Deneb, the brightest stars of the northern constellations Lyra, Aquila and Cygnus. With three… Read More »Summer Triangle

The Keystone

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keystone in hercules

The Keystone is an asterism formed by four relatively bright stars in the constellation Hercules: Pi, Eta, Zeta and Epsilon Herculis. The trapezoid-shaped pattern makes it easy for observers to identify the constellation and to find several well-known deep sky objects. On a clear night, the Keystone can be seen between the bright Vega, the brightest star in Lyra, and the stars of Corona Borealis, the Northern Crown. The asterism represents Hercules’ torso.
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