Alpha Centauri is the nearest star system to the Sun, located at a distance of only 4.37 light years or 1.34 parsecs from Earth. It is the brightest star in Centaurus constellation and the third brightest star in sky.
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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Deneb, Alpha Cygni, is the brightest star in Cygnus constellation and the most distant of all first magnitude stars.
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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Vega, Alpha Lyrae, is the brightest star in Lyra constellation and the fifth brightest star in the sky.
Vega is only fainter than Sirius in Canis Major, Canopus in Carina, Alpha Centauri in Centaurus, and Arcturus in Boötes constellation. It is the second brightest star in the northern celestial hemisphere, with only Arcturus appearing brighter.
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