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Arcturus est une des étoiles les plus lumineuses de l’hémisphère nord. Elle est très proche du pôle nord galactique : sa latitude galactique est d'environ 70°, ce qui la place à 20° du pôle.
2 ημέρες πριν · Stellarium Web is a planetarium running in your web browser. It shows a realistic star map, just like what you see with the naked eye, binoculars or a telescope.
Arcturus est l’étoile principale de la constellation du Bouvier. Troisième étoile la plus brillante du ciel nocturne, elle est parfaitement reconnaissable grâce à sa lumière légèrement rougeâtre.
Arcturus is the brightest star in the northern constellation of Boötes. With an apparent visual magnitude of −0.05, [2] it is the fourth-brightest star in the night sky, and the brightest in the northern celestial hemisphere.
11 Φεβ 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). Arcturus is also among the brightest stars that...
9 Ιουν 2023 · Arcturus is a giant star of the spectral type K1.5IIIFe-0.5. It is the brightest class K giant in the sky, outshining Aldebaran (mag. 0.86) in the constellation Taurus and Pollux (mag. 1.14) in Gemini. It has an absolute magnitude of about -0.30.
20 Ιαν 2020 · Arcturus is a red giant star of spectral type K0III. It is an old star with an approximate age of around 7.1 billion years. Observations show us that the Arcturus star has used up its core hydrogen and thus moved off the main sequence.
