Asterism (astronomy)
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An asterism is an observed pattern or group of stars in the sky. Asterisms can be any identified star pattern, and therefore are a more general concept than the 88 formally defined constellations. Con
The bright stars in this photo form the asterism Brocchi's Cluster in the constellation Vulpecula, also known as "The Coathanger."
Three Leaps of the Gazelle asterism
The "Teapot" asterism in Sagittarius. The Milky Way appears as "steam" coming from the spout.
The "37" or "LE" of NGC 2169, in Orion. It is visible with binoculars.
Arcturus
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Arcturus is a red giant star in the northern constellation of Boötes, and the brightest star in the constellation. It has the Bayer designation α Boötis, which is Latinized to Alpha Boötis and abbrevi
Arcturus is the brightest star in the constellation of Boötes.
Size comparison between the Sun, Beta Ursae Majoris, Pollux, and Arcturus
Arcturus next to the head of Comet Donati in 1858
Arcturus in Arctophylax, seen between his knees