The luminance and shape of pole star in not stable.
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Currently, Earth's pole stars are Polaris (Alpha Ursae Minoris), a magnitude-2 star aligned approximately with its northern axis, and a pre-eminent star in celestial navigation, and Polaris Australis (Sigma Octantis), a much dimmer star. From around 1700 BC until just after 300 AD, Kochab and Pherkad were twin northern pole stars, though neither was as close to the pole as Polaris is now.
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