How Big Is the North Star?

The North Star, also known as Polaris, is actually a triple star system. The largest and by far most prominent star in the system, Polaris A, possesses a mass six times that of the sun and boasts a diameter of about 38 million miles.

Polaris A is classified as a yellow supergiant star. Its two companions are yellow-white dwarf stars both slightly larger than the sun. Polaris AB orbits the main star at a distance of 2 billion miles and is about 866,000 miles across, with a mass of about 1.26 suns. Polaris B is located 240 billion miles away from Polaris A and possesses a diameter of 1.1 million miles and masses about 1.39 suns.