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It is designated α Ursae Minoris (Latinized to Alpha Ursae Minoris) and is commonly called the North Star or Pole Star. With an apparent magnitude that fluctuates around 1.98, [3] it is the brightest star in the constellation and is readily visible to the naked eye at night. [16]
28 juil. 2021 · The North Star isn't the brightest star in the sky, but it's usually not hard to spot, even from the city. If you're in the Northern Hemisphere, it can help you orient yourself and find your way, as it's located in the direction of true north (or geographic north, as opposed to magnetic north).
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Polaris, Earth’s present northern polestar, or North Star, at the end of the ‘handle’ of the so-called Little Dipper in the constellation Ursa Minor. Polaris is actually a triple star. It is located about 447.6 light-years from Earth and is the closest Cepheid variable.
- The Editors of Encyclopaedia Britannica
9 sept. 2019 · Polaris, Alpha Ursae Minoris (α UMi), commonly known as the North Star, is the closest relatively bright star to the north celestial pole. It lies at an estimated distance between 323 and 433 light years (99 to 133 parsecs) from Earth and has an apparent magnitude that varies between 1.86 and 2.13.
- 323-433 light years (99-133 parsecs)
- RA: 198.8 ± 0.20 mas/yr
- 7.54 ± 0.11 mas
- 17 km/s
28 juil. 2014 · Polaris, also known as the North Star, Alpha Ursae Minoris or Star of Arcady, is the brightest star in Ursa Minor constellation. It is the closest bright star to the North Celestial Pole. The pole marks true north, which makes the North Star important in navigation, as the star’s elevation above the horizon closely matches the observer’s latitude.
20 févr. 2023 · The North Star, or Polaris, is a very special star that sits almost directly at the Earth’s North celestial pole. It’s the only bright motionless star in the sky. It’s a more consistent navigational tool than a magnetic compass. But today's North Star won't stay still forever. Why is that?
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