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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 (Aquila, Cygnus, and Lyra, respectively). The greatest declination is +45° and lowest is +9° meaning the three can be ...
Deneb (/ ˈdɛnɛb /) is a first-magnitude blue supergiant star in the constellation of Cygnus. Deneb is one of the vertices of the asterism known as the Summer Triangle and the "head" of the Northern Cross. It is the brightest star in Cygnus and the 19th brightest star in the night sky, with an average apparent magnitude of +1.25.
This star lies at a vertex of a widely spaced asterism called the Summer Triangle, which consists of Vega plus the two first-magnitude stars Altair, in Aquila, and Deneb in Cygnus. [30] This formation is the approximate shape of a right triangle, with Vega located at its right angle. The Summer Triangle is recognizable in the northern skies for ...
The Summer Triangle is extremely easy to identify, and you’ll see all three stars every night in the summertime, even if you live in the heart of a city or under a light-polluted sky.
It is one of the three stars of the Summer Triangle, along with Vega and Deneb. [6] [7] [8] It is an A-type main-sequence star with 1.8 times the mass of the Sun and 11 times its luminosity. [9] [10] The star rotates quickly, and this gives the star an oblate shape where it is flattened towards the poles. [9] [10] [11]
ḏanab, tail) – one of the brightest stars in the night sky and the most distant first-magnitude star – as its "tail star" and one corner of the Summer Triangle the constellation forming an east pointing altitude of the triangle. [1] It also has some notable X-ray sources and the giant stellar association of Cygnus OB2. [2]
Altair is an A-type main-sequence star with an apparent visual magnitude of 0.77 and is one of the vertices of the Summer Triangle asterism; the other two vertices are marked by Deneb and Vega. [7] [14] [15] It is located at a distance of 16.7 light-years (5.1 parsecs) from the Sun.
The Summer Triangle of Deneb, Altair, and Vega – α Cygni, α Aquilae, and α Lyrae – is prominent in the northern hemisphere summer skies, as its three stars are all of the 1st magnitude. [4] The stars of the Triangle are in the band of the Milky Way which marks the galactic equator, and are in the direction of the Galactic Center.