Asterism

the sickle of leo

The Sickle

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The Sickle of Leo is one of the most recognizable patterns in the spring sky. Formed by some of the brightest stars in the constellation Leo, the asterism outlines the mane of the celestial Lion.
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keystone in hercules

The Keystone

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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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winter circle,winter stars

Winter Hexagon

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The Winter Hexagon, also known as the Winter Circle, is a prominent winter asterism formed by seven stars prominent in the winter sky.

These are Rigel in Orion, Aldebaran in Taurus, Capella in Auriga, Castor and Pollux in Gemini, Procyon in Canis Minor, and Sirius in Canis Major constellation.

Sirius and Procyon are also part of the Winter Triangle, a smaller asterism that these two stars form with Betelgeuse in Orion.
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northern cross stars,northern cross constellation

Northern Cross

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The Northern Cross is a prominent asterism formed by the brightest stars in the constellation Cygnus. The constellation is often confused for the asterism because the Northern Cross is much easier to find than the entire constellation.
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