Almach (Gamma Andromedae)

Almach (Gamma Andromedae)

Gamma Andromedae is Almach, one of the most beautiful double stars in the night sky. It is the third brightest star in the constellation of Andromeda. In a telescope, Almach can be seen to be a gold and blue pair of stars separated by 9.58 arcseconds. The primary star (Gamma 1 Andromedae, also known as the A component) is a spectral-type K3 giant with a golden-yellow color. The secondary star (Gamma 2 Andromedae), at a position angle of 63 degrees, is an A-type main sequence star. Gamma 2 Andromedae is itself a double star with components labeled B and C that are separated by less than 1 arcsecond. Subsequent spectroscopic observations in 1957 to 1959 revealed that B is another double star, making the entire Gamma Andromedae system a quadruple star. The Almach star system is located 350 light-years away. Johann Tobias Mayer discovered that Almach was a double star in 1778, and Wilhelm Struve discovered that Gamma 2 Andromeda was a double star in

Album / Science Source / Gerard Lodriguss

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