Mount Diablo Astronomical Society

Glenn Spiegelman - Multiple Stars

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Alberio in Cygnus
Albireo in Cygnus

Albireo is a double star seen in the sky as the foot of the Northern Cross; also it is the head of Cygnus the swan. It is also known as Beta Cygni, as the second brightest star in Cygnus. Visually, it is a breathtaking sight, and can be seen in all its glory with binoculars, which clearly split the pair, showing Beta 1 as a magnitude 3.1 yellow star, and Beta 2 as a magnitude 5.1 blue star. The two are separated by about 35 arc-seconds, and the stars are some 400 light-years away from us.

Alcor and Mizar
Alcor and Mizar in Ursa Major
This double-star pair is located in the middle of the 'handle' of the Big Dipper asterism of the constellation Ursa Major. It can be easily seen with binoculars, and some people claim to be able to split this pair with their naked eyes
The Trapezium
The Trapezium in Orion
The Trapezium is a quadruple-star lodged deep within the heart of the Orion Nebula (M42). In this image, you can see some of the nebulosity of that Nebula. It is called the Trapezium due to its Trapezoidal shape.