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This Week: See Polaris, The North Star in the Little Dipper

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This Week: See Polaris, The North Star in the Little Dipper

Polaris, the North Star marks the end of the handle of the Little Dipper, whose stars are, for the most part, rather faint. It’s not so easily traced out in the sky unless the night is very dark and clear — even the smallest amount of moonlight or street lighting will blot out its four faintest stars.

To find Polaris, use the stars of the Big Dipper.

With the Moon out of the way in this week’s evening sky, now is a good time to see the stars that make up the Little Dipper. Aside from the North Star, the two stars at the front of the Little Dipper’s bowl are the only ones we can easily see. Called “Guardians of the Pole” these stars appear to march around Polaris like soldiers.

Many are under the mistaken belief that the North Star is the brightest star in the sky, but actually it ranks only 50th in brightness. Yet it always remains in very nearly the same spot in the sky year-round while the other stars circle around it.

Polaris was not always the star closest to the pole, however.  On account of the wobble of the Earth’s axis, the celestial pole shifts as the centuries go by, and different stars become the North Star at different times.  The brighter one of the Guardians, Kochab, was actually the North Star at the time of Plato, about 400 B.C.

Polaris is a yellow supergiant star, located at a distance of 433 light years from Earth.  So when you look at Polaris tonight, you’re actually seeing it as it was back in the year 1584 — it has taken that long for the light that left it all those many years ago, to reach our eyes now. Incredible!

How To Locate Polaris

The easiest way to find Polaris is to use the stars of the Big Dipper in the constellation Ursa Major. The two stars that make up the outer bowl of the Big Dipper, Dubhe and Merak (also known as the Pointers), will lead you right to it—draw an imaginary line straight up to Polaris, which is the tip of the handle of the Little Dipper.

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