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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...
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. The name Arcturus originated from ancient Greece; it was then cataloged as α Boötis by Johann Bayer in 1603, which is Latinized to Alpha Boötis.
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.
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.
30 Νοε 2023 · Arcturus is so bright that it ranks fourth among the brightest stars in the sky (behind Sirius, Canopus, and the binary system Alpha Centauri), making it one of the most luminous stars in the Northern Hemisphere.
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.
8 Φεβ 2016 · Arcturus is one of only a few stars mentioned in the Bible, and by the Middle Ages it was assigned magical properties and lumped together with fourteen other stars which were collectively known as “Behenian fixed stars”, considered especially useful in medieval astrology.
