2006
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Arcturus is the brightest star in the northern constellation of Boötes. With an apparent visual magnitude of −0.05, it is the fourth-brightest star in the night sky, and the brightest in the northern celestial hemisphere.
Deve il nome a questa stella, e al suo significato di "guardiano", Regulus Arcturus Black, personaggio della saga di Harry Potter, di J. K. Rowling.
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11 feb 2022 · Arcturus is a red giant star in the Northern Hemisphere of Earth's sky and the brightest star in the constellation Boötes (the herdsman).
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- Elizabeth Howell,Scott Dutfield
Arcturus, also known as Alpha Boötis, is one of the brightest stars in the northern hemisphere. In fact, it is the third brightest individual star in the entire night sky behind Sirius and Canopus. At times, it is referred to as the fourth brightest star in the night sky, behind Alpha Centauri, when binary stars are included.
10 giu 2024 · Arcturus, the fourth brightest star in the night sky, and the brightest star in the northern constellation Boötes, with an apparent visual magnitude of −0.05. It is an orange-coloured giant star 36.7 light-years from Earth. It lies in an almost direct line with the tail of Ursa Major (the Great.
13 ott 2020 · Arcturus is a fine example of a red giant star — impressively large, accordingly rarefied, brilliantly bright, and surprisingly cool. Arcturus possesses only slightly more mass than the Sun, but expands that material into a radius about 25 times larger.
