Asterisms Summer Triangle

The Summer Triangle is an astronomical asterism in the northern celestial hemisphere. The defining vertices of this imaginary triangle are at Altair, Deneb, and Vega, each of which is the brightest star of its constellation. The term was popularized by American author H. A. Rey and British astronomer Patrick Moore in the 1950s. The name can be found in constellation guidebooks as far back as 1913. Source: Wikipedia

Stars of the Summer Triangle; source: Astrojourney

Summer Triangle in the night sky; source: astrobackyard.com

The stars of the Summer Triangle

Star Altair Deneb Vega

Designation α Aql α Cyg α Lyr

Constellation Aquila Cygnus Lyra

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