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Summer Triangle

Autumn Triangle

Asterism of the summer sky (Northern Hemisphere)

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GenitivesAquilae, Cygni, Lyrae, Sagittae, Vulpeculae
AbbreviationsAql, Cyg, Lyr, Sge, Vul
Constellation FamilyHercules
Celestial QuadrantNQ4
Right Ascension18h37 to 20h41
Declination+8.9° to +45.3°
Area (sq deg)401
Brightest StarVega in Lyra
Optimum VisibilityJuly / August
NotesThis triangle of bright stars provides an invaluable signpost to the major constellations of the northern summer sky. The three brilliant stars that mark the corners of the triangle occupy a wide area of the sky between Pegasus to the east and Hercules to the west, while the southern tip of the triangle points the way toward Sagittarius the Archer.
Map of the Summer Triangle Map of the Summer Triangle

The triangular shape formed by the three bright stars Deneb, Vega and Altair. The home constellations of these three stars, respectively Cygnus, Lyra and Aquila, are extremely prominent in the summer skies of the northern hemisphere.


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