Vega
They are both very bright, particularly Altair. Altair is also part of what is known as the summer triangle, along with Deneb in the constellation Cygnus and Vega in the constellation Lyra.
Vega is the bright star that forms the summer triangle with Deneb and Altair. It is the fifth brightest star in the night sky and is easily visible during the summer months from the northern hemisphere. Vega is part of the constellation Lyra and has been used as a navigational reference point for centuries.
The three stars that make up The Summer Triangle are: Vega, Altair, and Deneb.Look below at Sources and related links to see the stars and constellations of The Summer Triangle.
The Summer Triangle is named for its prominence in the night sky during the summer months in the Northern Hemisphere. It is formed by three bright stars: Vega, Deneb, and Altair, which are the brightest stars in the constellations Lyra, Cygnus, and Aquila, respectively. The triangle is easily recognizable and serves as a navigational aid for stargazers. Its seasonal visibility and distinct shape contributed to its naming as a key feature of summer astronomy.
It is a reference to three bright stars that can be seen in northern hemisphere. Altair in the constellation Aquila, forms the top of the triangle. Vega in the constellation Lyra is the brightest star and is almost directly overhead. Deneb in the constellation Cygnus is the third star.
Aquila: The eagle of Zeus. The constellation is also known as the "summer triangle"
At the beginning of July, the constellation visible in the night sky is typically Hercules, which is prominent during this time. Additionally, the bright summer constellations like Lyra and Cygnus also become more visible in early July. These constellations are part of the Summer Triangle, which is formed by the bright stars Vega, Deneb, and Altair. The clear skies of summer make these constellations particularly striking.
The brightest star in the constellation of Aquila is Altair. It is one of the three stars that form the Summer Triangle, along with Vega and Deneb. Altair is a prominent star in the night sky and is located relatively close to Earth compared to other stars.
Since you neglected to name two of them in the question, I'll have to list all three in order to be sure of answering it: -- Vega . . . in Lyra -- Altair . . . in Aquila -- Deneb . . . in Cygnus
This stars of the winter triangle are a landmark of the winter night sky and is formed by our brightest night sky star, Sirius, the giant star, Betelgeuse, and the brightest star in Canis Minor, Procyon.
Deneb is a bright star located in the constellation Cygnus, also known as the Northern Cross. It is approximately 1,425 light-years away from Earth and is one of the farthest naked-eye stars visible to us. Deneb is part of the Summer Triangle asterism, along with Vega and Altair.
Lyra is a small but prominent constellation in the northern sky, best known for containing the bright star Vega, one of the brightest stars visible from Earth. It is often associated with the myth of Orpheus, the legendary musician, and is depicted as a lyre or harp. The constellation includes several other notable stars and is part of the Summer Triangle asterism, which also features the stars Altair and Deneb. Lyra is visible in the northern hemisphere during the summer months.