Star in the constellation Perseus, 93 light years from Sol. Algol was the first known eclipsing binary star, its nature determined by the deaf astronomer John Goodricke. The A and B stars together have a magnitude that ranges from 3.4 to 2.1 as seen from Earth, because the dimmer but larger B component passes in front of the A component; the period is 2.9 days. The stars form a so called semi-detached binary.
The A component is a bright blue-white B-Class star; the B component is a K-Class giant star. The K-class star has transferred much of its mass to the other star, and is much less massive than it would be otherwise.
There is a third component, an A-type star which orbits the pair at a mean distance of nearly one astronomical unit.
The star system Algol produces a great deal of power, and material from the accretion disk can be relatively easily extracted, making this one of the richest systems in the inner Middle Regions. A number of NoCoZo corporations are based here, most notably the Algol Broadcasting Federation.