The Summer Triangle is one of the most familiar patterns in the northern summer night sky.
The three bright stars that mark the vertices of the Summer Triangle are Altair, Deneb, and Vega, the brightest stars in the constellations Aquila, Cygnus, and Lyra. The star pattern makes it easy to locate each of the three constellations.
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Altair, or Alpha Aquilae, is the brightest star in the constellation Aquila, the Eagle. It lies only 16.7 light years from Earth.
The star has a visual magnitude of 0.77. Along with the stars Vega in Lyra constellation and Deneb in Cygnus, Altair forms the Summer Triangle, a prominent asterism in the northern hemisphere. It is one of the nearest stars to Earth that are visible to the naked eye.
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